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39 lines
984 B
JavaScript
39 lines
984 B
JavaScript
dojo.provide("dojox.validate.isbn");
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// summary: Provides ISBN validation functions in `dojox.validate`
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//
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dojox.validate.isValidIsbn = function(/* String */value) {
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// summary: Validate ISBN-10 or ISBN-13 based on the length of value
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// value: String
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// An ISBN to validate
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// returns: Boolean
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var len, sum = 0, weight;
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if(!dojo.isString(value)){
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value = String(value);
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}
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value = value.replace(/[- ]/g,''); //ignore dashes and whitespaces
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len = value.length;
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switch(len){
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case 10:
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weight = len;
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// ISBN-10 validation algorithm
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for(var i = 0; i < 9; i++){
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sum += parseInt(value.charAt(i)) * weight;
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weight--;
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}
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var t = value.charAt(9).toUpperCase();
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sum += t == 'X' ? 10 : parseInt(t);
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return sum % 11 == 0; // Boolean
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break;
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case 13:
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weight = -1;
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for(var i = 0; i< len; i++){
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sum += parseInt(value.charAt(i)) * (2 + weight);
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weight *= -1;
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}
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return sum % 10 == 0; // Boolean
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break;
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}
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return false;
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}
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