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POHow to fix this error dealing with an iframe
 

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  1. POHow to fix this error dealing with an iframe
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    <p>I am trying to stop a file from uploading when the user clicks on the "Cancel" button. To do this I am thinking of stopping the transport inside the iframe. The problem is be able to code this correctly. Below is the code of what I am trying to achieve but I am getting this error when I click on the "Cancel" button: </p> <pre><code>Uncaught exception: [Exception.... “Not enough arguments [nslDOMHTML.Document.execCommand]” nresult: “0x80570001 (NS_ERROR_XPC_NOT_ENOUGH_ARGS)” location: “JS frame;; https://......../QandATable.php = &lt;TOP_LEVEL&gt; ;; line 765” data: no] </code></pre> <p>First of all how can this error be fixed and second how can the code below be written correctly so that when the "Cancel" button is clicked on, it stops the transport inside the iframe?</p> <p>Below is the startImageUpload() function where it starts uploading a file. Within that function is the function which handles the "Cancel" button when it is clicked;</p> <pre><code>function startImageUpload(imageuploadform){ $(".imageCancel").click(function() { $('.upload_target')[0].contentwindow if ($('.upload_target')[0].contentWindow.document.execCommand) { // IE browsers $('.upload_target')[0].contentWindow.document.execCommand('Stop'); } else { // other browsers $('.upload_target')[0].contentWindow.stop(); } return stopImageUpload(); }); return true; } </code></pre> <p>Below is the form code which consists of the iframe:</p> <pre><code> var $fileImage = $("&lt;form action='imageupload.php' method='post' enctype='multipart/form-data' target='upload_target' onsubmit='return startImageUpload(this);' class='imageuploadform' &gt;" + "Image File: &lt;input name='fileImage' type='file' class='fileImage' /&gt;&lt;/label&gt;&lt;br/&gt;&lt;br/&gt;&lt;label class='imagelbl'&gt;" + "&lt;input type='submit' name='submitImageBtn' class='sbtnimage' value='Upload' /&gt;&lt;/label&gt;" + "&lt;/p&gt;&lt;p class='imagef1_cancel' align='center'&gt;&lt;label&gt;" + "&lt;input type='button' name='imageCancel' class='imageCancel' value='Cancel' /&gt;&lt;/label&gt;&lt;/p&gt;" + "&lt;iframe class='upload_target' name='upload_target' src='#' style='width:0;height:0;border:0px;solid;#fff;'&gt;&lt;/iframe&gt;&lt;/form&gt;"); </code></pre>
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