How can I perform a JavaScript function defined into a .js file included in my page from the page?

Question

I am pretty new in JavaScript and I have the following doubt.

Into a JSP page I include a .js file that contains a function definition, in this way:

<script src="<c:url value="resources/js/userAgentInfo.js" />"></script>

Into this userAgentInfo.js file I have define a function, something like this:

function exludeUserAgent() {

    ...............................................
    ...............................................
    ...............................................

    if (browserName === "Microsoft Internet Explorer" && majorVersion <= 10) {
        alert("EXCLUDE");
        return true;
    }
    
    return false;
}

OK, now my problem is: how can I call and perform this exludeUserAgent() function into my page? I have included the file that contain its definition but now I want to perform it when the page is loaded.

Are you wanting to exclude functionality based on a specific feature? If so, I'd suggest feature detection instead of User agent sniffing. — Johan
– Johan, Commented Sep 7, 2015 at 10:24

bhavikshah28 · Accepted Answer · 2015-09-07 10:13:12Z

2

Write the below code in your JSP page:

<script type="text/javascript">
$(document).ready(function(){
   exludeUserAgent()
});
</script>

answered Sep 7, 2015 at 10:13

bhavikshah28

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1 Comment

hindmost Over a year ago

The question has no jquery tag, so your answer seems to be irrelevant

Elvin Haci · Accepted Answer · 2015-09-07 10:16:57Z

0

Just use this single block in your webpage:

<script type="text/javascript"> exludeUserAgent();</script>

answered Sep 7, 2015 at 10:16

Elvin Haci

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Comments

Alexander Ermer · Accepted Answer · 2015-09-07 10:18:27Z

0

if you have jQuery in your page try:

<script type="text/javascript">
$(document).ready(function(){
   exludeUserAgent()
});
</script>

if no jQuery is available you can try:

<script type="text/javascript">
    window.onload = function(){
        exludeUserAgent();
    };
</script>

both script blocks just need to be part of your jsp

answered Sep 7, 2015 at 10:18

Alexander Ermer

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enhzflep · Accepted Answer · 2015-09-07 10:21:58Z

0

Typically, I attach an event to the onload event of the window. This will be fired whenever all the resources initially present on the page have loaded (css/html/images/sounds/videos).

To do this, you simply need do the following:

window.addEventListener('load', onDocLoaded, false);

Next, you need a function that will actually handle this event:

function onDocLoaded(evt)
{
   /* initialization code goes here */
}

In your case, you'd just need to add a call to the exludeUserAgent function to the body of onDocLoaded.

answered Sep 7, 2015 at 10:21

enhzflep

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Comments

Aminadav Glickshtein · Accepted Answer · 2015-09-07 10:24:04Z

0

Wy to wait until the page load? I think you want to do that immediately when your script file loads.

Just add call to the function on the script file:

exludeUserAgent()
function exludeUserAgent() {

    ...............................................
    ...............................................
    ...............................................

    if (browserName === "Microsoft Internet Explorer" && majorVersion <= 10) {
        alert("EXCLUDE");
        return true;
    }

    return false;
}

One more note: As you can see you can call the function before you defined it. This is how JavaScript works...

answered Sep 7, 2015 at 10:24

Aminadav Glickshtein

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