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Editorial Team
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Asked: 2026-05-31T17:53:59+00:00

I am returning form elements into a form from ajax. I can count the

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I am returning form elements into a form from ajax. I can count the number of elements returned, but I don’t know how to cycle through them. I need to be able to get the value of each element returned.

I am pretty sure this is a basic javascript thing that I just don’t know. The problem only looks more complicated with the Ajax.

My code looks like this:

    // The view page
    <html>
    <head>
    <script language="javascript">
    function calculateAlphaTotals(){
        var length = document.myForm["alpha[]"].length;
        alert( length ); // correctly outputs 3
        for( var i = 0; i < length; i++ ){
            try{
                alert( document.myForm["alpha[]"].value ); // HTML ObjectCollection 
                alert( document.myForm["alpha["+i+"]"].value ); // Object Required
            } catch( error ) { }
        }
    }
    </script>
    </head>
    <body>
    <form name="myForm" id="myFormId" method="post">
        <div id="ajaxOutputId"></div>
    </form>
    </body>
    </html>

    // The Ajax page:

    <input name="alpha[]" onchange="calculateAlphaTotals()" />
    <input name="alpha[]" onchange="calculateAlphaTotals()" />
    <input name="alpha[]" onchange="calculateAlphaTotals()" />
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1 Answer

  1. Editorial Team

    try using document.myForm["alpha[]"][i].value instead of document.myForm["alpha["+i+"]"].value

    so you function will be like this

        function calculateAlphaTotals(){
        var length = document.myForm["alpha[]"].length;
        alert( length ); // correctly outputs 3
        for( var i = 0; i < length; i++ ){
            try{
                alert( document.myForm["alpha[]"][i].value ); // Object Required
            } catch( error ) { }
        }
    }
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