AJAX - The Complete Reference

Chapter 2: Pre-Ajax JavaScript Communications Techniques 27

PART I

else

var iframe = document.createElement("iframe");

iframe.style.visibility = "hidden";

document.body.appendChild(iframe);

return iframe;

}

function makeIframeForm(ifr, url, payload)

{

var ifrDoc = null;

var ifrWindow = ifr.contentWindow || ifr.contentDocument;

if (ifrWindow.document)

ifrDoc = ifrWindow.document;

else

ifrDoc = ifrWindow;

if (!ifrDoc.body)

{

var html = ifrDoc.createElement("HTML");

ifrDoc.appendChild(html);

var head = ifrDoc.createElement("HEAD");

html.appendChild(head);

var body = ifrDoc.createElement("BODY");

html.appendChild(body);

}

var ifrForm = ifrDoc.createElement("FORM");

ifrForm.action = url;

ifrForm.method = "post";

ifrDoc.body.appendChild(ifrForm);

for (var key in payload)

{

var ifrText = ifrDoc.createElement("INPUT");

ifrText.type = "text";

ifrText.name = key;

ifrText.value = encodeValue(payload[key]);

ifrForm.appendChild(ifrText);

}

return ifrForm;

}

var ifr = makeIframe();

var ifrForm = makeIframeForm(ifr, url, payload);

ifrForm.submit();

}

function rate(rating, comment)

{

var ratingVal = 0;

/* determine rating value */

for (var i=0; i < rating.length; i++)

{

if (rating[i].checked)

{

ratingVal = rating[i].value;