onmouseover='src="img1.gif
or
onmouseover='this.src="img
Both would work if you have focus on the element where you have this script.
onmouseover='this.src="img
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Question
Any difference between onmouseover='src="img1.gif"' and onmouseover='this.src="img1.gif"'
I just realized that when I assign a function to an event, I've been randomly using either,
onmouseover='src="img1.gif
or
onmouseover='this.src="img
and either of them work just fine
Are there any differences in those two?
I see more people are using this.src=..., are there any problems with just doing src=...
I had posted exactly the same question at http://www.experts-exchang
What Zvonko said in there is not quote true since it still works when I had a global variable named src...
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Answers
Hi,
I've only had 1 mug of espresso so far, so the following may be somewhat disorganized :)
As you may have noticed, both IE & FF handle "src" & "this.src" in the same manner because of the reason stated by sognoct (above). Essentially, 'this' relates to whatever you are referring. In your case, 'this' refers to the mousedover's image source. Since javascript assumes 'this', there is no functional difference.
Wat Zvonko said about global variables & naming conventions is true (but not fully explained). If you have two variables with the same name (whether one is a keyword or not) and one is declared global & the other local, you will not always end up with the results expected.
Local variables lose their scope (die/cease to exist) when they leave the function; global variables retain their values until explicitly changed.
Older browsers tended to confuse keywords & variable names under certain conditions, which made the usage of 'this' popular.
this.src and src are only equivalent on elements that have a src property, otherwise this.src will set the property on the element and src will set the property on the window object.
For instance:
<img onmouseover="foo='bar';" onmouseout="alert(this.foo
- doesn't work because foo is assigned to the window object, not the img element.
And:
<img onmouseover="this.foo='bar
- does work! (not tested *every* browser though)
I think it's better practice to be explicit and always use 'this' in event handlers, to avoid accidental scope-leak at least.
--
Lee
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by: sognoctPosted on 2007-12-05 at 02:04:49ID: 20410073
In JavaScript this always refers to the owner of the function we're executing, or rather, to the object that a function is a method of. When we define our faithful function doSomething() in a page, its owner is the page, or rather, the window object (or global object) of JavaScript.
read there
http://www.quirksmode.org/