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/* Storing & retrieving form fields in a JSON cookie |
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* copyright Will Bradley, 2012, released under a CC-BY license |
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* |
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* Change all instances of "myform" as necessary. |
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* Cookie will be stored under the current URL, but |
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* it won't include any hidden fields, etc. |
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*/ |
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function setCookie(c_name,value,expireminutes) |
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{ |
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var exdate=new Date(); |
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exdate.setMinutes(exdate.getMinutes()+expireminutes); |
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document.cookie=c_name+ "=" +escape(value)+ |
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((expireminutes==null) ? "" : ";expires="+exdate.toUTCString()); |
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} |
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function getCookie(c_name) |
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{ |
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if (document.cookie.length>0) |
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{ |
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c_start=document.cookie.indexOf(c_name + "="); |
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if (c_start!=-1) |
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{ |
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c_start=c_start + c_name.length+1; |
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c_end=document.cookie.indexOf(";",c_start); |
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if (c_end==-1) c_end=document.cookie.length; |
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return unescape(document.cookie.substring(c_start,c_end)); |
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} |
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} |
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return ""; |
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} |
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function onSubmit() |
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{ |
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var form=document.myform; |
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var json = []; |
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// Loop through all the form elements |
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for (var i=0;i<form.length;i++) { |
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// Make sure they're valid to be stored (i.e. checked, not a button) |
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if (form.elements[i].name && (form.elements[i].checked |
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|| /select|textarea/i.test(form.elements[i].nodeName) |
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|| /text|password/i.test(form.elements[i].type))) { |
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// Store them in an object association |
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var entry = {}; |
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entry[form.elements[i].name] = form.elements[i].value; |
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json.push(entry); |
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//alert(form.elements[i].id+": "+form.elements[i].value); |
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} |
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} |
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setCookie("myform",JSON.stringify(json),1); |
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//alert(JSON.stringify(json)); |
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} |
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function onLoad() { |
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// load values from cookie |
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var cookie = getCookie("myform"); |
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if(cookie.length > 10){ |
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var retval = JSON.parse(cookie); |
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//alert(retval.length); |
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for(var i=0;i<retval.length;i++) { |
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var obj = retval[i]; |
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for(var key in obj){ |
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//alert(key+": "+obj[key]); |
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document.myform.elements[key].value = obj[key]; |
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} |
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} |
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} |
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} |
