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OnFocus in hidden div

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chrissparkle

chrissparkle

Programmer
Mar 27, 2006
50
NZ
I have a div which is hidden when the page is loaded. When the user clicks a link it shows the DIV and inside the DIV is a small comments form to complete. The comments form has two fields, a subject and a message field.

I want the subject (input type text) to have focus (ie, cursor in field) when the user clicks the link to show the DIV.

I tried putting in the usual onLoad focus into the body but I got errors that form field was inivisble, disabled or hidden etc etc.

Is there a way to achieve this?
 
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That's great and exactly what I needed, except when I click the button again to hide the div it tries to focus it again, and it brings up the error that the form field is invisible.

Code: 
<a href="javascript:toggleLayer('commentForm');document.ReplyF.message.focus()" title="Reply to this message">

That's my code - is there a way to have that focus code just fire when the div is being shown.

This is the js function:

Code: 
function toggleLayer(whichLayer)
{if (document.getElementById)
{// this is the way the standards work 
var style2 = document.getElementById(whichLayer).style;
style2.display = style2.display? "":"block";

}
else if (document.all)
{// this is the way old msie versions work
var style2 = document.all[whichLayer].style;
style2.display = style2.display? "":"block";
}
else if (document.layers)
{// this is the way nn4 works
var style2 = document.layers[whichLayer].style;
style2.display = style2.display? "":"block";
}
}
 
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You can do it like this.

[tt]<a href="javascript:toggleLayer('commentForm');[blue]if (document.ReplyF && document.ReplyF.message) {[/blue]document.ReplyF.message.focus()[blue]}[/blue]" title="Reply to this message">[/tt]
 
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Sorry! Misread the problem. The correct attack is to check the style of the display!

[tt]<a href="javascript:toggleLayer('commentForm');if (document.ReplyF.message.style.display!="hidden") {document.ReplyF.message.focus()}" title="Reply to this message">[/tt]

If the setting is "none" or "invisible", modify the conditional accordingly. That's the idea.
 
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Just a quick amendment. "hidden" might be set to style.visibility. If it is display setting, check against "none" instead.
 
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<a href="javascript:toggleLayer('commentForm');if (document.ReplyF.message.style.display!="hidden") {document.ReplyF.message.focus()}" title="Reply to this message">

This brings up a 'syntax error'?
 
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I changed it to "none" cos that's what in my css, and now its working but still bringing up the message "cannot chane focus because field is hidden or invisible etc
 
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The conditional must be scripted according to the page what designer has planned to put on the page. Except very dynamically generated page, the scripter should know before hand what kind of style is applied to the element, inline style or using stylesheet's class or other selector! If you know it is through stylesheet class, then of course a conditional test on the inline style (as posted) would not be sufficient to eliminate attempt to focus on hidden element.

Here is a test page for using inline or stylesheet class selector. As the scripter is pretending not knowing what kind of style is applying to the element, the function is consequently more involved. It shouldn't be except the element is dynamic to such a degree that the designer has no idea the eventual page look like---a very unlikely case.
[tt]
<html>
<head>
<script language="javascript">

function toggleLayer(whichLayer)
{if (document.getElementById)
{// this is the way the standards work
var style2 = document.getElementById(whichLayer).style;
style2.display = style2.display? "":"block";

}
else if (document.all)
{// this is the way old msie versions work
var style2 = document.all[whichLayer].style;
style2.display = style2.display? "":"block";
}
else if (document.layers)
{// this is the way nn4 works
var style2 = document.layers[whichLayer].style;
style2.display = style2.display? "":"block";
}
}
</script>
<style type="text/css">
.theShow {display:none;}
</style>
</head>
<body>
<div id="theDiv" style="display:none">abc</div>
<form name="theForm">
<!-- case [1]
<input type="text" name="theSubject" style="display:none;" value="default" />
-->
<!-- case [2] -->
<input type="text" name="theSubject" class="theShow" value="default" />
<!-- -->
</form>
<a href="javascript:document.getElementById('theDiv').style.display='block';
if (document.theForm.theSubject.style.display && (document.theForm.theSubject.style.display!='none')) {
document.theForm.theSubject.focus()
} else if (document.theForm.theSubject.className.length!=0) {
var sclass=document.theForm.theSubject.className;
var ocsssheets=document.styleSheets;
for (var i=0;i<ocsssheets.length;i++) {
var ocss=ocsssheets;
if (ocss.rules) {
ocss.cssRules=ocss.rules;
}
for (var j=0;j<ocss.cssRules.length;j++) {
if (ocss.cssRules[j].selectorText.indexOf('.' + sclass) != -1) {
if (ocss.cssRules[j].style.display != 'none') {
document.theForm.theSubject.focus();
}
}
}
}
}
">Feedback</a>
</body>
</html>
[/tt]
Test case [1] and case [2] successively but commenting out the other.
 
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