#104 ✓invalid

form.serialize doesn't serialize radio buttons right

Reported by Evil.2000 | May 15th, 2008 @ 04:32 PM

If you want to serialize a form which has radio-buttons in, prototype serialises all of the radio buttons, not only the selected one.


<form method="POST" action="myscript.cgi" onsubmit="new Ajax.Updater('content', this.action, {method: 'post', parameters: $(this).serialize(true), evalScripts: true}); return false;">
<input type="radio" name="type" value="interval"> Interval
<input type="radio" name="type" value="once"> Once

This will produce the query string:


This is not a browser based error, because its reproduceable on Opera, Firefox and IE.

Comments and changes to this ticket

  • Evil.2000

    Evil.2000 May 15th, 2008 @ 06:28 PM

    I made a Quick'n'Dirty change to that so it will work for me for the moment.

    Hopefully this will be made in a better way ;)

      serializeElements: function(elements, options) {
        if (typeof options != 'object') options = { hash: !!options };
        else if (Object.isUndefined(options.hash)) options.hash = true;
        var key, value, submitted = false, submit = options.submit;
        var data = elements.inject({ }, function(result, element) {
          if (!element.disabled && element.name) {
            key = element.name; value = $(element).getValue();
            if (value != null && (element.type != 'submit' || (!submitted &&
                submit !== false && (!submit || key == submit) && (submitted = true)))) {
              if (key in result) {
                // a key is already present; construct an array of values
                // --- quick and dirty hack start ---
                if(!(element.type == 'radio' && value == '0')) {
                	if (!Object.isArray(result[key])) result[key] = [result[key]];
                // ---- quick and dirty hack end ----
              else result[key] = value;
          var debug = "";
          for (var schl in result) debug += schl+": "+result[schl]+"\n";
          return result;
        return options.hash ? data : Object.toQueryString(data);
  • John-David Dalton

    John-David Dalton May 16th, 2008 @ 04:33 AM

    Which version of Prototype are you using I don't think this is an issue in

  • John-David Dalton

    John-David Dalton May 16th, 2008 @ 04:41 AM

    Ya I cannot reproduce this in

  • Evil.2000

    Evil.2000 May 16th, 2008 @ 11:08 AM

    It says:

    Prototype JavaScript framework, version

    Okay i tested it again with fresh sources from www.projeotoypejs.org and it worked. Sorry, my bad!

    I found the error. I changed a line in Form.Element.Serializers.inputSelector from

        if (Object.isUndefined(value)) return element.checked ? element.value : null;


        if (Object.isUndefined(value)) return element.checked ? element.value : '0';

    Because i had a checkbox and wanted that this checkbox will be reported as '0' in serialized query sting if it isn't checked. So its easier to handle in any server-side script. But this affects the serializing of radio buttons, too.

    Maybe its better to serialize the checkbox- and radio-inputs in a seperate way?

    Or is there something easier to get this to work?

  • John-David Dalton

    John-David Dalton May 16th, 2008 @ 03:29 PM

    • State changed from “new” to “invalid”
  • John-David Dalton

    John-David Dalton May 16th, 2008 @ 03:30 PM

    you are free to modify the source code in anyway you want.

    With a small 'if' statement I am sure you can have checkboxes return 1 thing and radio buttons return another.

  • Evil.2000

    Evil.2000 May 19th, 2008 @ 11:25 AM

    I did.

    inputSelector: function(element, value) {
        if (Object.isUndefined(value)) {
        	if (element.type.toLowerCase() == "checkbox") {
        		return element.checked ? element.value : '0';
        	} else {
        		return element.checked ? element.value : null;
        } else {
        	element.checked = !!value;

    Maybe this kind of "feature" will be implemented is a future version of Prototype?

  • Tobie Langel

    Tobie Langel July 24th, 2009 @ 02:01 AM

    • Tag set to section:dom

    [not-tagged:"form" tagged:"section:dom" bulk edit command]

  • jeuxnewbanat

    jeuxnewbanat March 18th, 2016 @ 01:58 AM

    • Importance changed from “” to “”

    jeuxnewbanat يقدم أجمل وأحسن العاب تلبيس بنات حقيقية نعم حقيقة وليس خيال مع هدا الموقع المتجدد جربوه ولاتنسو مشاركته مع اصدقائكم

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