Chris Pietschmann

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JavaScript: Loop through all elements in a form

Since I've been doing alot of JavaScript programming lately, I figured I could start blogging some code snippets. Here is a JavaScript snippet that shows how to loop through all the elements in a form and retrieve their element type, name and values. I had to use this code to gather all form values so I could post them to the server using AJAX.

<html>
<head>
<script type="text/javascript">
    function DisplayFormValues()
    {
        var str = '';
        var elem = document.getElementById('frmMain').elements;
        for(var i = 0; i < elem.length; i++)
        {
            str += "<b>Type:</b>" + elem[i].type + "&nbsp&nbsp";
            str += "<b>Name:</b>" + elem[i].name + "&nbsp;&nbsp;";
            str += "<b>Value:</b><i>" + elem[i].value + "</i>&nbsp;&nbsp;";
            str += "<BR>";
        } 
        document.getElementById('lblValues').innerHTML = str;
    }
</script>
</head>
<body>
    <form id="frmMain" name="frmMain">
        <input type="hidden" name="ElemHidden" value="some hidden text" />
        <input type="text" name="ElemText" value="some text" /><br />
        <textarea name="ElemTextArea">Some text area text</textarea><br />
        <br />
        <input type="button" value="Test" onclick="DisplayFormValues();" /> 
    </form>
    <hr />
    <div id="lblValues"></div>
</body>
</html>

I revisited this code and tested it again to make sure it still works. I found that it works with the latest browser versions available today, in addition to older browsers, such as:

  • Internet Explorer 6, 7, 8
  • FireFox 3 & 4 Beta 4
  • Google Chrome
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