Re: Using Event.observe -- Closure issue?
Scott Sauyet <[email protected]> Wed, 07 Feb 2007 11:01:58 -0500
| Newsgroups | gmane.comp.web.dom.wdf |
|---|---|
| Message-ID | <[email protected]> |
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Adam Griffis wrote:
> The problem I'm having stems from passing multiple arguments to a function
> rather than just one at a time, and I think it might be some sort of
> closure issue but I'm not certain how to resolve it. I have the an example
> page set up, with a longer description and examples of the problem in
> action:
>
> http://www.griffisweb.com/tooltip/ <http://www.griffisweb.com/tooltip/>
You're right that it's a closure issue. A good example is at
http://blog.morrisjohns.com/javascript_closures_for_dummies#Example%205
You should be able to work around this by moving the closure creation
outside the loop and its loop variable, as in:
NDLS.addTooltip = function() {
for (var i = 0, length = arguments.length; i < length; i++) {
NDLS.addSingleTooltip(arguments[i]);
}
}
NDLS.addSingleTooltip = function(imgName) {
var elm = $C(imgName);
if (elm) {
Event.observe(elm,'mouseover',function(event){
NDLS.showTooltip(event,imgName); });
Event.observe(elm,'mouseout',NDLS.hideTooltip);
}
}
Good luck,
-- Scott
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<p>Adam Griffis wrote:<br>
> The problem I'm having stems from passing multiple arguments to a function<br>
> rather than just one at a time, and I think it might be some sort of<br>
> closure issue but I'm not certain how to resolve it. I have the an example<br>
> page set up, with a longer description and examples of the problem in<br>
> action:<br>
> <br>
> <a href="http://www.griffisweb.com/tooltip/">http://www.griffisw<wbr>eb.com/tooltip/</a> <<a href="http://www.griffisweb.com/tooltip/">http://www.griffisw<wbr>eb.com/tooltip/</a>><br>
<br>
You're right that it's a closure issue. A good example is at<br>
<br>
<a href="http://blog.morrisjohns.com/javascript_closures_for_dummies#Example%205">http://blog.<wbr>morrisjohns.<wbr>com/javascript_<wbr>closures_<wbr>for_dummies#<wbr>Example%205</a><br>
<br>
You should be able to work around this by moving the closure creation <br>
outside the loop and its loop variable, as in:<br>
<br>
NDLS.addTooltip = function() {<br>
for (var i = 0, length = arguments.length; i < length; i++) {<br>
NDLS.addSingleToolt<wbr>ip(arguments[<wbr>i]);<br>
}<br>
}<br>
<br>
NDLS.addSingleToolt<wbr>ip = function(imgName) {<br>
var elm = $C(imgName);<br>
if (elm) {<br>
Event.observe(<wbr>elm,'mouseover'<wbr>,function(<wbr>event){<br>
NDLS.showTooltip(<wbr>event,imgName)<wbr>; });<br>
Event.observe(<wbr>elm,'mouseout'<wbr>,NDLS.hideToolti<wbr>p);<br>
}<br>
}<br>
<br>
Good luck,<br>
<br>
-- Scott<br>
<br>
</p>
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