I searched, I swear. All my keywords were ignored by the search engine. Or I may just suck at searching with the right keywords, but I've been unable to find information about this. Perhaps somebody can elaborate.
I would to like to create a function, included in the header of an HTML page, which calls functions which are defined later, in <script /> tags farther down in the body of the page (I understand this is a terrible idea, but it is a constraint that I have to work with). Unfortunately, the intuitive way (but inherently impossible) of doing this doesn't work: -
function myEarlyFunction() {
-
if(typeof myLateFunction != 'undefined') {
-
myLateFunction();
-
}
-
}
-
...
-
...
-
...
-
<script type="text/javascript">
-
function myLateFunction() {
-
//do stuff
-
}
-
</script>
Is there a way to do this that...well, works? And if so, how?
Thanks so much!
4  2713 
I searched, I swear. All my keywords were ignored by the search engine. Or I may just suck at searching with the right keywords, but I've been unable to find information about this. Perhaps somebody can elaborate.
I would to like to create a function, included in the header of an HTML page, which calls functions which are defined later, in <script /> tags farther down in the body of the page (I understand this is a terrible idea, but it is a constraint that I have to work with). Unfortunately, the intuitive way (but inherently impossible) of doing this doesn't work:
-
function myEarlyFunction() {
-
if(typeof myLateFunction != 'undefined') {
-
myLateFunction();
-
}
-
}
-
...
-
...
-
...
-
<script type="text/javascript">
-
function myLateFunction() {
-
//do stuff
-
}
-
</script>
Is there a way to do this that...well, works? And if so, how?
Thanks so much!
Try this it will work insha-Allah -
function myEarlyFunction() {
-
if( (typeof myLateFunction != 'undefined') && (typeof myLateFunction == 'function') )
-
myLateFunction();
-
}
-
}
-
Try this it will work insha-Allah
-
function myEarlyFunction() {
-
if( (typeof myLateFunction != 'undefined') && (typeof myLateFunction == 'function') )
-
myLateFunction();
-
}
-
}
-
This doesn't work. The problem is that, at the time of parsing, the JavaScript interpreter can find no definition of "myLateFunction " and so this test is never even considered. Try it. Just make an HTML file out of this and see what happens... - <script type="text/javascript">
-
function earlyFunction() {
-
if(typeof lateFunction != 'undefined' && typeof lateFunction == 'function') {
-
lateFunction();
-
}
-
-
}
-
</script>
-
-
Holy crap it's de text. Lol.
-
-
<script type="text/javascript">
-
function lateFunction() {
-
alert("HOLLAH!");
-
}
-
</script>
-
-
It's more text.
-
-
<script type="text/javascript">
-
-
earlyFunction();
-
-
</script>
What I'm looking for is some other mechanism for _dynamically_ (i.e. at RUNTIME) doing function lookups and allowing this sort of behavior. Suggestions? Thanks again!
I apologize. I'm an idiot. I had a typo in my sample file. Misaw is right; this does, in fact work. However, you don't need the (typeof ___ == "function") . Simply conditionalizin g on undefined works just fine.
Try this...
Put the function below within the "<head></head>" tags
<script type="text/javascript">
<!--
function addEvent(elemen tObject, eventName, functionObject)
{
if(document.add EventListener)
elementObject.a ddEventListener (eventName, functionObject, false);
else
if(document.att achEvent)
elementObject.a ttachEvent("on" + eventName, functionObject) ;
}
function earlyFucntion() {
if(typeof myLateFunction != 'undefined') {
myLateFunction( );
}
}
addEvent(window ,'load',earlyFu cntion);
//-->
</script>
then call your
<script type="text/javascript">
<!--
function myLateFunction( ){
alert("fire");
}
//-->
</script>
wherever in the document you want to...
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