Menu - 2 seconds delay to open submenu and showing hour glass (both IE6)

[guest]

see: ​http://archive.dojotoolkit.org/nightly/dojotoolkit/dijit/tests/test_Menu.html

On IE6: When opening a submenu it takes about 2 seconds to open the new layer. It is also showing a hour glass when opening a menulayer.

A ugly workaround is to place the following code in dijit.BackgroundIframe?:

if (!dojo.byId("BackgroundIframe_Waiting_Preventer")) {

var tmp_link = document.createElement("a");
tmp_link.href = "javascript:";
tmp_link.id = "BackgroundIframe_Waiting_Preventer";
document.body.appendChild(tmp_link);
tmp_link.click();
tmp_link.style.display = "none";

}

so dijit.BackgroundIframe? looks like:

dijit.BackgroundIframe? = function(/* HTMLElement */node){

summary: For IE z-index schenanigans. id attribute is required. description: new dijit.BackgroundIframe?(node) Makes a background iframe as a child of node, that fills area (and position) of node

if(!node.id){ throw new Error("no id"); }

if((dojo.isIE && dojo.isIE < 7)

(dojo.isFF && dojo.isFF < 3 && dojo.hasClass(dojo.body(), "dijit_a11y"))){

var iframe;
if(dojo.isIE){

if (!dojo.byId("BackgroundIframe_Waiting_Preventer")) {

var tmp_link = document.createElement("a");

tmp_link.href = "javascript:"; tmp_link.id = "BackgroundIframe_Waiting_Preventer"; document.body.appendChild(tmp_link); tmp_link.click(); tmp_link.style.display = "none";

}

var html="<iframe src='javascript:""'"

+ " style='position: absolute; left: 0px; top: 0px;" + " width: expression(document.getElementById("" + node.id + "").offsetWidth);" + " height: expression(document.getElementById("" + node.id + "").offsetHeight); " + "z-index: -1; filter:Alpha(Opacity="0");'>";

iframe = dojo.doc.createElement(html);

}else{

iframe = dojo.doc.createElement("iframe");

iframe.src = 'javascript:""'; iframe.className = "dijitBackgroundIframe";

} iframe.tabIndex = -1; Magic to prevent iframe from getting focus on tab keypress - as style didnt work. node.appendChild(iframe); this.iframe = iframe;

}

};

[bill]

Hmm, the backgroundIframe is causing the delay? I was supposing it was from IE Developer Toolbar. OK, thanks for the info. probably we can cache background iframes then... Not sure what your code above is doing exactly. if(dojo.isIE){...}else{...} There should be no else block because we don't create iframes except for IE6.

[guest]

I came up to this this solution by inserting a link with href="javascript:" in ​http://archive.dojotoolkit.org/nightly/dojotoolkit/dijit/tests/test_Menu.html

If you first click the 'javascript:' link, there is no more delay. In dijit.BackgroundIframe? I create and click this link programmaticly.

The if(dojo.isIE){...}else{...} preexists in the dijit/_base/popup.js (from line 186)

[guest]

Bill, you're right. Delay only occurs with installed IE Developer Toolbar. Just tested.

[bill]

(In [10099]) Fixes #4057: cache BackgroundIframes? to prevent 2s delay on IE6.

[bill]

(In [16540]) Fixes #8561: Visible IFRAMEs when using Dijits on IE6

I removed the code to pre-create a background iframe on IE6 on page load. This code was added in [10099] (refs #4057) to prevent a 2s delay on IE6 showing the first popup, but I'm not seeing that problem anymore, and the code is questionable anyway since it slows down page load time.