Question

i have a iframe and form like this :

<iframe id="FileUploadFrame" name="FileUploadFrame" src="" style="display: none; border: 0; width: 0; height: 0;">
            <form id="FileUploadForm" name="FileUploadForm" accept-charset="utf-8"  target="FileUploadFrame" enctype="multipart/form-data" encoding="multipart/form-data" method="POST" action="CIMtrek_Regional_WhseForm_FileUpload">
   </form>
</iframe>

and this is how i submit the form which in iframe

function fileUpload() {

    //var UploadForm = document.forms["FileUploadForm"];
    var UploadForm = global.forms["FileUploadForm"];

    alert("Form : "+typeof global.forms["FileUploadForm"]);
    alert("Form : "+typeof global.forms["FileUploadFrame"]);
    iframeId = document.getElementById("FileUploadFrame");


    // Add event...
    var eventHandler = function () {

        if (iframeId.detachEvent) iframeId.detachEvent("onload", eventHandler);
        else iframeId.removeEventListener("load", eventHandler, false);

        // Message from server...
        if (iframeId.contentDocument) {
            content = iframeId.contentDocument.body.innerHTML;
        } else if (iframeId.contentWindow) {
            content = iframeId.contentWindow.document.body.innerHTML;
        } else if (iframeId.document) {
            content = iframeId.document.body.innerHTML;
        }

        document.getElementById(div_id).innerHTML = content;
    }
    if (iframeId.addEventListener) iframeId.addEventListener("load", eventHandler, true);
    if (iframeId.attachEvent) iframeId.attachEvent("onload", eventHandler);

    //alert('submitting form');
    //form.submit();
    //document.forms["FileUploadForm"].submit();
    alert(UploadForm.submit());
}

but i get the following exception when submitting the form :

Error: Unable to get value of the property 'submit': object is null or undefined

Please help me to find the problem and fix.

Best Regards

Answer 1

The way to get the FileUploadForm is:

iframeId = document.getElementById("FileUploadFrame");
//This is the trick
var ifrDoc = iframeId.contentDocument || iframeId.contentWindow.document;
var UploadForm = ifrDoc.getElementById("FileUploadForm");

Or you could have some code in the frame that sets a variable in parent to the form, but I wouldn’t trust that method.

Source: accessing a form that is in an iframe

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EDIT:

Also, for get the upload form valid it needs to looks just like any other form except:

• the form tag must specify the POST method
• the form tag must specify an enctype of multipart/form-data
• the form must contain an <input type=file> element.