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528 lines
15 KiB
JavaScript
528 lines
15 KiB
JavaScript
dojo.provide("dojox.data.HtmlStore");
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dojo.require("dojox.xml.parser");
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dojo.require("dojo.data.util.simpleFetch");
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dojo.require("dojo.data.util.filter");
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dojo.declare("dojox.data.HtmlStore", null, {
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constructor: function(/*Object*/args){
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// summary:
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// Initializer for the HTML table store.
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// description:
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// The HtmlStore can be created in one of two ways: a) by parsing an existing
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// table or list DOM node on the current page or b) by referencing an external url and giving
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// the id of the table or listin that page. The remote url will be parsed as an html page.
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//
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// The HTML table or list should be of the following form:
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//
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// | <table id="myTable">
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// | <thead>
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// | <tr>
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// | <th>Attribute1</th>
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// | <th>Attribute2</th>
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// | </tr>
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// | </thead>
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// | <tbody>
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// | <tr>
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// | <td>Value1.1</td>
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// | <td>Value1.2</td>
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// | </tr>
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// | <tr>
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// | <td>Value2.1</td>
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// | <td>Value2.2</td>
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// | </tr>
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// | </tbody>
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// | </table>
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//
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// -or-
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//
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// | <ul id="myUnorderedList">
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// | <li>Value.1</li>
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// | <li>Value.2</li>
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// | </ul>
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//
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// -or-
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//
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// | <ol id="myOrderedList">
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// | <li>Value.1</li>
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// | <li>Value.2</li>
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// | </ol>
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//
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// args:
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// An anonymous object to initialize properties. It expects the following values:
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// dataId: The id of the HTML table to use.
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// OR
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// url: The url of the remote page to load
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// dataId: The id of the table element in the remote page
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if(args.url){
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if(!args.dataId)
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throw new Error("dojo.data.HtmlStore: Cannot instantiate using url without an id!");
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this.url = args.url;
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this.dataId = args.dataId;
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}else{
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if(args.dataId){
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this._rootNode = dojo.byId(args.dataId);
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this.dataId = this._rootNode.id;
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}else{
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this._rootNode = dojo.byId(this.dataId);
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}
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this._indexItems();
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}
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},
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url: "", // So the parser can instantiate the store via markup.
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dataId: "", // So the parser can instantiate the store via markup.
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_indexItems: function(){
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this._getHeadings();
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if (this._rootNode.rows){//tables
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if(this._rootNode.tBodies && this._rootNode.tBodies.length > 0) {
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this._rootNode = this._rootNode.tBodies[0];
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}
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var i;
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for(i=0; i<this._rootNode.rows.length; i++){
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this._rootNode.rows[i].store = this;
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this._rootNode.rows[i]._ident = i+1;
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}
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}else{//lists
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var c=1;
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for(i=0; i<this._rootNode.childNodes.length; i++){
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if(this._rootNode.childNodes[i].nodeType===1){
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this._rootNode.childNodes[i].store = this;
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this._rootNode.childNodes[i]._ident = c;
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c++;
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}
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}
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}
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},
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_getHeadings: function(){
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// summary:
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// Function to load the attribute names from the table header so that the
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// attributes (cells in a row), can have a reasonable name.
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// For list items, returns single implicit heading, ["name"]
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this._headings = [];
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if(this._rootNode.tHead){
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dojo.forEach(this._rootNode.tHead.rows[0].cells, dojo.hitch(this, function(th){
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this._headings.push(dojox.xml.parser.textContent(th));
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}));
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}else{
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this._headings = ["name"];
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}
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},
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_getAllItems: function(){
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// summary:
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// Function to return all rows in the table as an array of items.
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var items = [];
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var i;
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if(this._rootNode.rows){//table
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for(i=0; i<this._rootNode.rows.length; i++){
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items.push(this._rootNode.rows[i]);
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}
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}else{ //list
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for(i=0; i<this._rootNode.childNodes.length; i++){
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if (this._rootNode.childNodes[i].nodeType===1){
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items.push(this._rootNode.childNodes[i]);
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}
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}
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}
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return items; //array
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},
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_assertIsItem: function(/* item */ item){
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// summary:
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// This function tests whether the item passed in is indeed an item in the store.
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// item:
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// The item to test for being contained by the store.
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if(!this.isItem(item)){
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throw new Error("dojo.data.HtmlStore: a function was passed an item argument that was not an item");
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}
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},
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_assertIsAttribute: function(/* String */ attribute){
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// summary:
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// This function tests whether the item passed in is indeed a valid 'attribute' like type for the store.
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// attribute:
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// The attribute to test for being contained by the store.
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//
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// returns:
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// Returns the index (column) that the attribute resides in the row.
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if(typeof attribute !== "string"){
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throw new Error("dojo.data.HtmlStore: a function was passed an attribute argument that was not an attribute name string");
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return -1;
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}
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return dojo.indexOf(this._headings, attribute); //int
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},
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/***************************************
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dojo.data.api.Read API
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***************************************/
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getValue: function( /* item */ item,
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/* attribute-name-string */ attribute,
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/* value? */ defaultValue){
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// summary:
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// See dojo.data.api.Read.getValue()
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var values = this.getValues(item, attribute);
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return (values.length > 0)?values[0]:defaultValue; //Object || int || Boolean
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},
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getValues: function(/* item */ item,
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/* attribute-name-string */ attribute){
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// summary:
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// See dojo.data.api.Read.getValues()
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this._assertIsItem(item);
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var index = this._assertIsAttribute(attribute);
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if(index>-1){
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if (item.cells){
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return [dojox.xml.parser.textContent(item.cells[index])];
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}else{//return Value for lists
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return [dojox.xml.parser.textContent(item)];
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}
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}
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return []; //Array
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},
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getAttributes: function(/* item */ item){
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// summary:
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// See dojo.data.api.Read.getAttributes()
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this._assertIsItem(item);
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var attributes = [];
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for(var i=0; i<this._headings.length; i++){
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if(this.hasAttribute(item, this._headings[i]))
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attributes.push(this._headings[i]);
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}
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return attributes; //Array
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},
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hasAttribute: function( /* item */ item,
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/* attribute-name-string */ attribute){
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// summary:
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// See dojo.data.api.Read.hasAttribute()
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return this.getValues(item, attribute).length > 0;
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},
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containsValue: function(/* item */ item,
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/* attribute-name-string */ attribute,
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/* anything */ value){
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// summary:
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// See dojo.data.api.Read.containsValue()
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var regexp = undefined;
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if(typeof value === "string"){
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regexp = dojo.data.util.filter.patternToRegExp(value, false);
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}
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return this._containsValue(item, attribute, value, regexp); //boolean.
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},
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_containsValue: function( /* item */ item,
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/* attribute-name-string */ attribute,
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/* anything */ value,
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/* RegExp?*/ regexp){
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// summary:
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// Internal function for looking at the values contained by the item.
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// description:
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// Internal function for looking at the values contained by the item. This
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// function allows for denoting if the comparison should be case sensitive for
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// strings or not (for handling filtering cases where string case should not matter)
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//
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// item:
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// The data item to examine for attribute values.
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// attribute:
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// The attribute to inspect.
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// value:
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// The value to match.
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// regexp:
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// Optional regular expression generated off value if value was of string type to handle wildcarding.
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// If present and attribute values are string, then it can be used for comparison instead of 'value'
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var values = this.getValues(item, attribute);
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for(var i = 0; i < values.length; ++i){
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var possibleValue = values[i];
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if(typeof possibleValue === "string" && regexp){
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return (possibleValue.match(regexp) !== null);
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}else{
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//Non-string matching.
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if(value === possibleValue){
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return true; // Boolean
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}
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}
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}
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return false; // Boolean
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},
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isItem: function(/* anything */ something){
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// summary:
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// See dojo.data.api.Read.isItem()
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if(something && something.store && something.store === this){
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return true; //boolean
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}
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return false; //boolean
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},
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isItemLoaded: function(/* anything */ something){
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// summary:
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// See dojo.data.api.Read.isItemLoaded()
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return this.isItem(something);
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},
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loadItem: function(/* Object */ keywordArgs){
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// summary:
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// See dojo.data.api.Read.loadItem()
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this._assertIsItem(keywordArgs.item);
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},
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_fetchItems: function(request, fetchHandler, errorHandler){
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// summary:
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// Fetch items (XML elements) that match to a query
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// description:
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// If '_fetchUrl' is specified, it is used to load an XML document
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// with a query string.
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// Otherwise and if 'url' is specified, the XML document is
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// loaded and list XML elements that match to a query (set of element
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// names and their text attribute values that the items to contain).
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// A wildcard, "*" can be used to query values to match all
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// occurrences.
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// If '_rootItem' is specified, it is used to fetch items.
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// request:
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// A request object
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// fetchHandler:
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// A function to call for fetched items
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// errorHandler:
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// A function to call on error
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if(this._rootNode){
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this._finishFetchItems(request, fetchHandler, errorHandler);
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}else{
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if(!this.url){
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this._rootNode = dojo.byId(this.dataId);
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}else{
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var getArgs = {
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url: this.url,
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handleAs: "text"
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};
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var self = this;
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var getHandler = dojo.xhrGet(getArgs);
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getHandler.addCallback(function(data){
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var findNode = function(node, id){
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if(node.id == id){
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return node; //object
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}
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if(node.childNodes){
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for(var i=0; i<node.childNodes.length; i++){
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var returnNode = findNode(node.childNodes[i], id);
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if(returnNode){
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return returnNode; //object
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}
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}
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}
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return null; //null
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}
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var d = document.createElement("div");
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d.innerHTML = data;
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self._rootNode = findNode(d, self.dataId);
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self._indexItems();
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self._finishFetchItems(request, fetchHandler, errorHandler);
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});
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getHandler.addErrback(function(error){
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errorHandler(error, request);
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});
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}
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}
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},
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_finishFetchItems: function(request, fetchHandler, errorHandler){
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// summary:
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// Internal function for processing the passed in request and locating the requested items.
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var items = null;
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var arrayOfAllItems = this._getAllItems();
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if(request.query){
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var ignoreCase = request.queryOptions ? request.queryOptions.ignoreCase : false;
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items = [];
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//See if there are any string values that can be regexp parsed first to avoid multiple regexp gens on the
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//same value for each item examined. Much more efficient.
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var regexpList = {};
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var key;
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var value;
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for(key in request.query){
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value = request.query[key]+'';
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if(typeof value === "string"){
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regexpList[key] = dojo.data.util.filter.patternToRegExp(value, ignoreCase);
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}
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}
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for(var i = 0; i < arrayOfAllItems.length; ++i){
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var match = true;
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var candidateItem = arrayOfAllItems[i];
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for(key in request.query){
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value = request.query[key]+'';
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if (!this._containsValue(candidateItem, key, value, regexpList[key])){
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match = false;
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}
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}
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if(match){
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items.push(candidateItem);
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}
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}
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fetchHandler(items, request);
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}else{
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// We want a copy to pass back in case the parent wishes to sort the array. We shouldn't allow resort
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// of the internal list so that multiple callers can get listsand sort without affecting each other.
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if(arrayOfAllItems.length> 0){
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items = arrayOfAllItems.slice(0,arrayOfAllItems.length);
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}
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fetchHandler(items, request);
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}
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},
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getFeatures: function(){
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// summary:
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// See dojo.data.api.Read.getFeatures()
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return {
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'dojo.data.api.Read': true,
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'dojo.data.api.Identity': true
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};
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},
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close: function(/*dojo.data.api.Request || keywordArgs || null */ request){
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// summary:
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// See dojo.data.api.Read.close()
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// nothing to do here!
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},
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getLabel: function(/* item */ item){
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// summary:
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// See dojo.data.api.Read.getLabel()
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if(this.isItem(item)){
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if(item.cells){
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return "Item #" + this.getIdentity(item);
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}else{
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return this.getValue(item,"name");
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}
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}
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return undefined;
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},
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getLabelAttributes: function(/* item */ item){
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// summary:
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// See dojo.data.api.Read.getLabelAttributes()
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if(item.cells){
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return null;
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}else{
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return ["name"];
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}
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},
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/***************************************
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dojo.data.api.Identity API
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***************************************/
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getIdentity: function(/* item */ item){
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// summary:
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// See dojo.data.api.Identity.getIdentity()
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this._assertIsItem(item);
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if(this.hasAttribute(item, "name")){
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return this.getValue(item,"name");
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}else{
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return item._ident;
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}
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},
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getIdentityAttributes: function(/* item */ item){
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// summary:
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// See dojo.data.api.Identity.getIdentityAttributes()
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//Identity isn't taken from a public attribute.
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return null;
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},
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fetchItemByIdentity: function(keywordArgs){
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// summary:
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// See dojo.data.api.Identity.fetchItemByIdentity()
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var identity = keywordArgs.identity;
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var self = this;
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var item = null;
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var scope = null;
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if(!this._rootNode){
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if(!this.url){
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this._rootNode = dojo.byId(this.dataId);
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this._indexItems();
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if(self._rootNode.rows){ //Table
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item = this._rootNode.rows[identity + 1];
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}else{ //Lists
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for(var i = 0; i < self._rootNode.childNodes.length; i++){
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if(self._rootNode.childNodes[i].nodeType === 1 && identity === dojox.xml.parser.textContent(self._rootNode.childNodes[i])) {
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item = self._rootNode.childNodes[i];
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}
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}
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}
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if(keywordArgs.onItem){
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scope = keywordArgs.scope?keywordArgs.scope:dojo.global;
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keywordArgs.onItem.call(scope, item);
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}
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}else{
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var getArgs = {
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url: this.url,
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handleAs: "text"
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};
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var getHandler = dojo.xhrGet(getArgs);
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getHandler.addCallback(function(data){
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var findNode = function(node, id){
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if(node.id == id){
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return node; //object
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}
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if(node.childNodes){
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for(var i=0; i<node.childNodes.length; i++){
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var returnNode = findNode(node.childNodes[i], id);
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if(returnNode){
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return returnNode; //object
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}
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}
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}
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return null; //null
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}
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var d = document.createElement("div");
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d.innerHTML = data;
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self._rootNode = findNode(d, self.dataId);
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self._indexItems();
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if(self._rootNode.rows && identity <= self._rootNode.rows.length){ //Table
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item = self._rootNode.rows[identity-1];
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}else{ //List
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for(var i = 0; i < self._rootNode.childNodes.length; i++){
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if(self._rootNode.childNodes[i].nodeType === 1 && identity === dojox.xml.parser.textContent(self._rootNode.childNodes[i])) {
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item = self._rootNode.childNodes[i];
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break;
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}
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}
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}
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if(keywordArgs.onItem){
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scope = keywordArgs.scope?keywordArgs.scope:dojo.global;
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keywordArgs.onItem.call(scope, item);
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}
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});
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getHandler.addErrback(function(error){
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if(keywordArgs.onError){
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scope = keywordArgs.scope?keywordArgs.scope:dojo.global;
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keywordArgs.onError.call(scope, error);
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}
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});
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}
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}else{
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if(this._rootNode.rows[identity+1]){
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item = this._rootNode.rows[identity+1];
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if(keywordArgs.onItem){
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scope = keywordArgs.scope?keywordArgs.scope:dojo.global;
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keywordArgs.onItem.call(scope, item);
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}
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}
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}
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}
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});
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dojo.extend(dojox.data.HtmlStore,dojo.data.util.simpleFetch);
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