588 lines
20 KiB
JavaScript
588 lines
20 KiB
JavaScript
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dojo.provide("dojox.data.GoogleSearchStore");
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dojo.provide("dojox.data.GoogleWebSearchStore");
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dojo.provide("dojox.data.GoogleBlogSearchStore");
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dojo.provide("dojox.data.GoogleLocalSearchStore");
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dojo.provide("dojox.data.GoogleVideoSearchStore");
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dojo.provide("dojox.data.GoogleNewsSearchStore");
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dojo.provide("dojox.data.GoogleBookSearchStore");
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dojo.provide("dojox.data.GoogleImageSearchStore");
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dojo.require("dojo.io.script");
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dojo.experimental("dojox.data.GoogleSearchStore");
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dojo.declare("dojox.data.GoogleSearchStore",null,{
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// summary:
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// A data store for retrieving search results from Google.
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// This data store acts as a base class for Google searches,
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// and has a number of child data stores that implement different
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// searches. This store defaults to searching the web, and is functionally
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// identical to the dojox.data.GoogleWebSearchStore object.
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// The following attributes are supported on each item:
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// <ul>
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// <li>url - The URL for the item</li>
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// <li>unescapedUrl - The URL for the item, with URL escaping. This is often more readable</li>
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// <li>visibleUrl - The URL with no protocol specified.
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// <li>cacheUrl - The URL to the copy of the document cached by Google
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// <li>title - The page title in HTML format.</li>
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// <li>titleNoFormatting - The page title in plain text</li>
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// <li>content - A snippet of information about the page</li>
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// </ul>
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// The query accepts one parameter: text - The string to search for
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constructor: function(/*Object*/args){
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// summary:
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// Initializer for the GoogleSearchStore store.
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// description:
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// The GoogleSearchStore is a Datastore interface to
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// the Google search service. The constructor accepts the following arguments:
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// <ul>
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// <li>label - the label attribute to use. Defaults to titleNoFormatting</li>
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// <li>key - The API key to use. This is optional</li>
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// <li>lang - The language locale to use. Defaults to the browser locale</li>
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// </ul>
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if(args){
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if(args.label){
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this.label = args.label;
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}
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if(args.key){
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this._key = args.key;
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}
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if(args.lang){
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this._lang = args.lang;
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}
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}
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this._id = dojox.data.GoogleSearchStore.prototype._id++;
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},
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// _id: Integer
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// A unique identifier for this store.
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_id: 0,
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// _requestCount: Integer
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// A counter for the number of requests made. This is used to define
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// the callback function that GoogleSearchStore will use.
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_requestCount: 0,
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// _googleUrl: String
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// The URL to Googles search web service.
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_googleUrl: "http://ajax.googleapis.com/ajax/services/search/",
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// _storeRef: String
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// The internal reference added to each item pointing at the store which owns it.
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_storeRef: "_S",
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// _attributes: Array
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// The list of attributes that this store supports
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_attributes: ["unescapedUrl", "url", "visibleUrl", "cacheUrl", "title", "titleNoFormatting", "content"],
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// label: String
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// The default attribute which acts as a label for each item.
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label: "titleNoFormatting",
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// type: String
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// The type of search. Valid values are "web", "local", "video", "blogs", "news", "books", "images".
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// This should not be set directly. Instead use one of the child classes.
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_type: "web",
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_queryAttr: "text",
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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("dojox.data.GoogleSearchStore: 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(/* attribute-name-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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if(typeof attribute !== "string"){
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throw new Error("dojox.data.GoogleSearchStore: a function was passed an attribute argument that was not an attribute name string");
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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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};
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},
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getValue: function(item, attribute, 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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if(values && values.length > 0){
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return values[0];
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}
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return defaultValue;
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},
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getAttributes: function(item){
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// summary:
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// See dojo.data.api.Read.getAttributes()
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return this._attributes;
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},
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hasAttribute: function(item, attribute){
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// summary:
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// See dojo.data.api.Read.hasAttributes()
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if(this.getValue(item,attribute)){
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return true;
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}
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return false;
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},
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isItemLoaded: function(item){
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// summary:
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// See dojo.data.api.Read.isItemLoaded()
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return this.isItem(item);
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},
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loadItem: function(keywordArgs){
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// summary:
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// See dojo.data.api.Read.loadItem()
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},
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getLabel: function(item){
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// summary:
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// See dojo.data.api.Read.getLabel()
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return this.getValue(item,this.label);
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},
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getLabelAttributes: function(item){
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// summary:
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// See dojo.data.api.Read.getLabelAttributes()
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return [this.label];
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},
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containsValue: function(item, attribute, value){
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// summary:
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// See dojo.data.api.Read.containsValue()
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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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if(values[i] === value){
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return true;
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}
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}
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return false;
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},
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getValues: function(item, attribute){
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// summary:
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// See dojo.data.api.Read.getValue()
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this._assertIsItem(item);
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this._assertIsAttribute(attribute);
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var val = item[attribute];
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if(dojo.isArray(val)) {
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return val;
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}else if(val !== undefined){
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return [val];
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}else{
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return [];
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}
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},
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isItem: function(item){
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// summary:
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// See dojo.data.api.Read.isItem()
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if(item && item[this._storeRef] === this){
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return true;
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}
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return false;
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},
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close: function(request){
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// summary:
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// See dojo.data.api.Read.close()
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},
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_format: function(item, name){
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return item;//base implementation does not format any items
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},
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fetch: function(request){
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// summary:
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// Fetch Google search items that match to a query
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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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request = request || {};
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var scope = request.scope || dojo.global;
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if(!request.query || !request.query[this._queryAttr]){
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if(request.onError){
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request.onError.call(scope, new Error(this.declaredClass +
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": A query must be specified, with a '" + [this._queryAttr] + "' parameter."));
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return;
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}
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}
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//Make a copy of the request object, in case it is
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//modified outside the store in the middle of a request
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var query = request.query[this._queryAttr];
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request = {
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query: {
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},
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onComplete: request.onComplete,
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onError: request.onError,
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onItem: request.onItem,
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onBegin: request.onBegin,
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start: request.start,
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count: request.count
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};
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request.query[this._queryAttr] = query;
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//Google's web api will only return a max of 8 results per page.
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var pageSize = 8;
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//Generate a unique function to be called back
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var callbackFn = "GoogleSearchStoreCallback_" + this._id + "_" + (++this._requestCount);
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//Build up the content to send the request for.
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//rsz is the result size, "large" gives 8 results each time
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var content = this._createContent(query, callbackFn, request);
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var firstRequest;
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if(typeof(request.start) === "undefined" || request.start === null){
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request.start = 0;
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}
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if(!request.count){
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request.count = pageSize;
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}
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firstRequest = {start: request.start - request.start % pageSize};
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var _this = this;
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var handle = null;
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var searchUrl = this._googleUrl + this._type;
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var getArgs = {
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url: searchUrl,
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preventCache: true,
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content: content
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};
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var items = [];
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var successfulReq = 0;
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var finished = false;
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var lastOnItem = request.start -1;
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var numRequests = 0;
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// Performs the remote request.
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function doRequest(req){
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//Record how many requests have been made.
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numRequests ++;
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getArgs.content.context = getArgs.content.start = req.start;
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var deferred = dojo.io.script.get(getArgs);
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//We only set up the errback, because the callback isn't ever really used because we have
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//to link to the jsonp callback function....
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deferred.addErrback(function(error){
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if(request.onError){
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request.onError.call(scope, error, request);
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}
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});
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}
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// Function to handle returned data.
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var myHandler = function(start, data){
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if(finished){return;}
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var results = _this._getItems(data);
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var cursor = data ? data['cursor']: null;
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if(results){
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//Process the results, adding the store reference to them
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for(var i = 0; i < results.length && i + start < request.count + request.start; i++) {
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_this._processItem(results[i], data);
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items[i + start] = results[i];
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}
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successfulReq ++;
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if(successfulReq == 1){
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// After the first request, we know how many results exist.
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// So perform any follow up requests to retrieve more data.
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var pages = cursor ? cursor.pages : null;
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var firstStart = pages ? Number(pages[pages.length - 1].start) : 0;
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//Call the onBegin method if it exists
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if (request.onBegin){
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var est = cursor ? cursor.estimatedResultCount : results.length;
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var total = est ? Math.min(est, firstStart + results.length) : firstStart + results.length;
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request.onBegin.call(scope, total, request);
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}
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// Request the next pages.
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var nextPage = (request.start - request.start % pageSize) + pageSize;
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var page = 1;
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while(pages){
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if(!pages[page] || Number(pages[page].start) >= request.start + request.count){
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break;
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}
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if(Number(pages[page].start) >= nextPage) {
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doRequest({start: pages[page].start});
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}
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page++;
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}
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}
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// Call the onItem function on all retrieved items.
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if(request.onItem && items[lastOnItem + 1]){
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do{
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lastOnItem++;
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request.onItem.call(scope, items[lastOnItem], request);
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}while(items[lastOnItem + 1] && lastOnItem < request.start + request.count);
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}
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//If this is the last request, call final fetch handler.
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if(successfulReq == numRequests){
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//Process the items...
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finished = true;
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//Clean up the function, it should never be called again
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dojo.global[callbackFn] = null;
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if(request.onItem){
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request.onComplete.call(scope, null, request);
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}else{
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items = items.slice(request.start, request.start + request.count);
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request.onComplete.call(scope, items, request);
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}
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}
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}
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};
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var callbacks = [];
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var lastCallback = firstRequest.start - 1;
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var sortFn = function(a,b){
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if(a.start < b.start){return -1;}
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if(b.start < a.start){return 1;}
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return 0;
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};
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// Attach a callback function to the global namespace, where Google can call it.
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dojo.global[callbackFn] = function(start, data, responseCode, errorMsg){
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try {
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if(responseCode != 200){
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if(request.onError){
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request.onError.call(scope, new Error("Response from Google was: " + responseCode), request);
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}
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dojo.global[callbackFn] = function(){};//an error occurred, do not return anything else.
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return;
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}
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if(start == lastCallback + 1){
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myHandler(Number(start), data);
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lastCallback += pageSize;
|
||
|
|
|
||
|
|
//make sure that the callbacks happen in the correct sequence
|
||
|
|
if(callbacks.length > 0){
|
||
|
|
callbacks.sort(sortFn);
|
||
|
|
//In case the requsts do not come back in order, sort the returned results.
|
||
|
|
while(callbacks.length > 0 && callbacks[0].start == lastCallback + 1){
|
||
|
|
myHandler(Number(callbacks[0].start), callbacks[0].data);
|
||
|
|
callbacks.splice(0,1);
|
||
|
|
lastCallback += pageSize;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}else{
|
||
|
|
callbacks.push({start:start, data: data});
|
||
|
|
}
|
||
|
|
} catch (e) {
|
||
|
|
request.onError.call(scope, e, request);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
// Perform the first request. When this has finished
|
||
|
|
// we will have a list of pages, which can then be
|
||
|
|
// gone through
|
||
|
|
doRequest(firstRequest);
|
||
|
|
},
|
||
|
|
|
||
|
|
_processItem: function(item, data) {
|
||
|
|
item[this._storeRef] = this;
|
||
|
|
},
|
||
|
|
|
||
|
|
_getItems: function(data){
|
||
|
|
return data['results'] || data;
|
||
|
|
},
|
||
|
|
|
||
|
|
_createContent: function(query, callback, request){
|
||
|
|
return {
|
||
|
|
q: query,
|
||
|
|
v:"1.0",
|
||
|
|
rsz:"large",
|
||
|
|
callback: callback,
|
||
|
|
key:this._key,
|
||
|
|
hl: this._lang
|
||
|
|
};
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
dojo.declare("dojox.data.GoogleWebSearchStore", dojox.data.GoogleSearchStore,{
|
||
|
|
// summary:
|
||
|
|
// A data store for retrieving search results from Google.
|
||
|
|
// The following attributes are supported on each item:
|
||
|
|
// <ul>
|
||
|
|
// <li>title - The page title in HTML format.</li>
|
||
|
|
// <li>titleNoFormatting - The page title in plain text</li>
|
||
|
|
// <li>content - A snippet of information about the page</li>
|
||
|
|
// <li>url - The URL for the item</li>
|
||
|
|
// <li>unescapedUrl - The URL for the item, with URL escaping. This is often more readable</li>
|
||
|
|
// <li>visibleUrl - The URL with no protocol specified.</li>
|
||
|
|
// <li>cacheUrl - The URL to the copy of the document cached by Google</li>
|
||
|
|
// </ul>
|
||
|
|
// The query accepts one parameter: text - The string to search for
|
||
|
|
});
|
||
|
|
|
||
|
|
dojo.declare("dojox.data.GoogleBlogSearchStore", dojox.data.GoogleSearchStore,{
|
||
|
|
// summary:
|
||
|
|
// A data store for retrieving search results from Google.
|
||
|
|
// The following attributes are supported on each item:
|
||
|
|
// <ul>
|
||
|
|
// <li>title - The blog post title in HTML format.</li>
|
||
|
|
// <li>titleNoFormatting - The blog post title in plain text</li>
|
||
|
|
// <li>content - A snippet of information about the blog post</li>
|
||
|
|
// <li>blogUrl - The URL for the blog</li>
|
||
|
|
// <li>postUrl - The URL for the a single blog post</li>
|
||
|
|
// <li>visibleUrl - The URL with no protocol specified.
|
||
|
|
// <li>cacheUrl - The URL to the copy of the document cached by Google
|
||
|
|
// <li>author - The author of the blog post</li>
|
||
|
|
// <li>publishedDate - The published date, in RFC-822 format</li>
|
||
|
|
// </ul>
|
||
|
|
// The query accepts one parameter: text - The string to search for
|
||
|
|
_type: "blogs",
|
||
|
|
_attributes: ["blogUrl", "postUrl", "title", "titleNoFormatting", "content", "author", "publishedDate"]
|
||
|
|
});
|
||
|
|
|
||
|
|
|
||
|
|
dojo.declare("dojox.data.GoogleLocalSearchStore", dojox.data.GoogleSearchStore,{
|
||
|
|
// summary:
|
||
|
|
// A data store for retrieving search results from Google.
|
||
|
|
// The following attributes are supported on each item:
|
||
|
|
// <ul>
|
||
|
|
// <li>title - The blog post title in HTML format.</li>
|
||
|
|
// <li>titleNoFormatting - The blog post title in plain text</li>
|
||
|
|
// <li>content - A snippet of information about the blog post</li>
|
||
|
|
// <li>url - The URL for the item</li>
|
||
|
|
// <li>lat - The latitude.</li>
|
||
|
|
// <li>lng - The longtitude.</li>
|
||
|
|
// <li>streetAddress - The street address</li>
|
||
|
|
// <li>city - The city</li>
|
||
|
|
// <li>region - The region</li>
|
||
|
|
// <li>country - The country</li>
|
||
|
|
// <li>phoneNumbers - Phone numbers associated with this address. Can be one or more.</li>
|
||
|
|
// <li>ddUrl - A URL that can be used to provide driving directions from the center of the search results to this search results</li>
|
||
|
|
// <li>ddUrlToHere - A URL that can be used to provide driving directions from this search result to a user specified location</li>
|
||
|
|
// <li>staticMapUrl - The published date, in RFC-822 format</li>
|
||
|
|
// </ul>
|
||
|
|
// The query accepts one parameter: text - The string to search for
|
||
|
|
_type: "local",
|
||
|
|
_attributes: ["title", "titleNoFormatting", "url", "lat", "lng", "streetAddress",
|
||
|
|
"city", "region", "country", "phoneNumbers", "ddUrl", "ddUrlToHere",
|
||
|
|
"ddUrlFromHere", "staticMapUrl"]
|
||
|
|
});
|
||
|
|
|
||
|
|
dojo.declare("dojox.data.GoogleVideoSearchStore", dojox.data.GoogleSearchStore,{
|
||
|
|
// summary:
|
||
|
|
// A data store for retrieving search results from Google.
|
||
|
|
// The following attributes are supported on each item:
|
||
|
|
// <ul>
|
||
|
|
// <li>title - The blog post title in HTML format.</li>
|
||
|
|
// <li>titleNoFormatting - The blog post title in plain text</li>
|
||
|
|
// <li>content - A snippet of information about the blog post</li>
|
||
|
|
// <li>url - The URL for the item</li>
|
||
|
|
// <li>published - The published date, in RFC-822 format.</li>
|
||
|
|
// <li>publisher - The name of the publisher.</li>
|
||
|
|
// <li>duration - The approximate duration, in seconds, of the video.</li>
|
||
|
|
// <li>tbWidth - The width in pixels of the video.</li>
|
||
|
|
// <li>tbHeight - The height in pixels of the video</li>
|
||
|
|
// <li>tbUrl - The URL to a thumbnail representation of the video.</li>
|
||
|
|
// <li>playUrl - If present, supplies the url of the flash version of the video that can be played inline on your page. To play this video simply create and <embed> element on your page using this value as the src attribute and using application/x-shockwave-flash as the type attribute. If you want the video to play right away, make sure to append &autoPlay=true to the url..</li>
|
||
|
|
// </ul>
|
||
|
|
// The query accepts one parameter: text - The string to search for
|
||
|
|
_type: "video",
|
||
|
|
_attributes: ["title", "titleNoFormatting", "content", "url", "published", "publisher",
|
||
|
|
"duration", "tbWidth", "tbHeight", "tbUrl", "playUrl"]
|
||
|
|
});
|
||
|
|
|
||
|
|
dojo.declare("dojox.data.GoogleNewsSearchStore", dojox.data.GoogleSearchStore,{
|
||
|
|
// summary:
|
||
|
|
// A data store for retrieving search results from Google.
|
||
|
|
// The following attributes are supported on each item:
|
||
|
|
// <ul>
|
||
|
|
// <li>title - The news story title in HTML format.</li>
|
||
|
|
// <li>titleNoFormatting - The news story title in plain text</li>
|
||
|
|
// <li>content - A snippet of information about the news story</li>
|
||
|
|
// <li>url - The URL for the item</li>
|
||
|
|
// <li>unescapedUrl - The URL for the item, with URL escaping. This is often more readable</li>
|
||
|
|
// <li>publisher - The name of the publisher</li>
|
||
|
|
// <li>clusterUrl - A URL pointing to a page listing related storied.</li>
|
||
|
|
// <li>location - The location of the news story.</li>
|
||
|
|
// <li>publishedDate - The date of publication, in RFC-822 format.</li>
|
||
|
|
// <li>relatedStories - An optional array of objects specifying related stories.
|
||
|
|
// Each object has the following subset of properties:
|
||
|
|
// "title", "titleNoFormatting", "url", "unescapedUrl", "publisher", "location", "publishedDate".
|
||
|
|
// </li>
|
||
|
|
// </ul>
|
||
|
|
// The query accepts one parameter: text - The string to search for
|
||
|
|
_type: "news",
|
||
|
|
_attributes: ["title", "titleNoFormatting", "content", "url", "unescapedUrl", "publisher",
|
||
|
|
"clusterUrl", "location", "publishedDate", "relatedStories" ]
|
||
|
|
});
|
||
|
|
|
||
|
|
dojo.declare("dojox.data.GoogleBookSearchStore", dojox.data.GoogleSearchStore,{
|
||
|
|
// summary:
|
||
|
|
// A data store for retrieving search results from Google.
|
||
|
|
// The following attributes are supported on each item:
|
||
|
|
// <ul>
|
||
|
|
// <li>title - The book title in HTML format.</li>
|
||
|
|
// <li>titleNoFormatting - The book title in plain text</li>
|
||
|
|
// <li>authors - An array of authors</li>
|
||
|
|
// <li>url - The URL for the item</li>
|
||
|
|
// <li>unescapedUrl - The URL for the item, with URL escaping. This is often more readable</li>
|
||
|
|
// <li>bookId - An identifier for the book, usually an ISBN.</li>
|
||
|
|
// <li>pageCount - The number of pages in the book.</li>
|
||
|
|
// <li>publishedYear - The year of publication.</li>
|
||
|
|
// </ul>
|
||
|
|
// The query accepts one parameter: text - The string to search for
|
||
|
|
_type: "books",
|
||
|
|
_attributes: ["title", "titleNoFormatting", "authors", "url", "unescapedUrl", "bookId",
|
||
|
|
"pageCount", "publishedYear"]
|
||
|
|
});
|
||
|
|
|
||
|
|
dojo.declare("dojox.data.GoogleImageSearchStore", dojox.data.GoogleSearchStore,{
|
||
|
|
// summary:
|
||
|
|
// A data store for retrieving search results from Google.
|
||
|
|
// The following attributes are supported on each item:
|
||
|
|
// <ul>
|
||
|
|
// <li>title - The image title in HTML format.</li>
|
||
|
|
// <li>titleNoFormatting - The image title in plain text</li>
|
||
|
|
// <li>url - The URL for the image</li>
|
||
|
|
// <li>unescapedUrl - The URL for the image, with URL escaping. This is often more readable</li>
|
||
|
|
// <li>tbUrl - The URL for the image thumbnail</li>
|
||
|
|
// <li>visibleUrl - A shortened version of the URL associated with the result, stripped of a protocol and path</li>
|
||
|
|
// <li>originalContextUrl - The URL of the page containing the image.</li>
|
||
|
|
// <li>width - The width of the image in pixels.</li>
|
||
|
|
// <li>height - The height of the image in pixels.</li>
|
||
|
|
// <li>tbWidth - The width of the image thumbnail in pixels.</li>
|
||
|
|
// <li>tbHeight - The height of the image thumbnail in pixels.</li>
|
||
|
|
// <li>content - A snippet of information about the image, in HTML format</li>
|
||
|
|
// <li>contentNoFormatting - A snippet of information about the image, in plain text</li>
|
||
|
|
// </ul>
|
||
|
|
// The query accepts one parameter: text - The string to search for
|
||
|
|
_type: "images",
|
||
|
|
_attributes: ["title", "titleNoFormatting", "visibleUrl", "url", "unescapedUrl", "originalContextUrl",
|
||
|
|
"width", "height", "tbWidth", "tbHeight", "tbUrl", "content", "contentNoFormatting"]
|
||
|
|
});
|