How do I link a Javascript file into another Javascript file - javascript

There are two files here in the same folder.
I am trying to invoke a function named greet of app1 in app2.
app1.html
<script>
function greet() {
alert('hello from App1')
}
// greet() // commented out code
</script>
app2.html
<script type="text/javascript" src="./app1.html"></script>
<script>
function app2() {
alert('app2')
}
app2()
greet() // this line of code is not working
</script>

If you want to call the file in an another js file then you have to refer that file in the calling file.
Ex.
Refer the files in the head section.
<head>
<script src="File2.js" type="text/javascript"></script>
<script src="File1.js" type="text/javascript"></script>
</head>
you can have your body tag something like this:
<body>
<script type="text/javascript">
Method2(); // Where you want to call method from another JS.
</script>
</body>
then, using first file
File1.js
function Method1(number) {
alert("Method1");
}
File2.js
function Method2() {
Method1("Method1 is called in Method2");
}

I would recomend have separate external js files instead of an embedded <script> tag, but maybe this can help
How to include js file in another js file?

Related

calling javascript function from another file

I am trying to accomplish something similar to: Calling a function from one JavaScript file which requires another
Essentially, I have index.php, which is the main file for the home page. Within the index file, I am calling a javascript function from another js file.
<script src="js/data.js"></script>
<script>(go_call())</script>
within data.js:
function go_call(){
alert('working');
}
I get the following error: Uncaught ReferenceError: go_call is not defined
UPDATE 1:
My original code is working fine in IE, but this error I have occurs in google chrome.
A function cannot be called unless it was defined in the same file or one loaded before the attempt to call it.
A function cannot be called unless it is in the same or greater scope then the one trying to call it.
It should work like this:
1) within data.js
function go_call(){
alert('working');
}
2) Within file2.js
function clickedTheButton() {
go_call();
}
3) Html File:
<html>
<head>
</head>
<body>
<button onclick="clickedTheButton()">Click me</button>
<script type="text/javascript" src="data.js"></script>
<script type="text/javascript" src="file2.js"></script>
</body>
</html>

Call javascript from HTML

I have a HTML file with the content:
<script src="http://spelprogrammering.nu/simple.js">
function test()
{
//Function stuff
}
</script>
However, I'd like to write all my javascript (Function test) in a separate document (.js). How do I refer to, or call, this separate file so I get the same result as if the code was directly in the HTML?
I need the http://spelprogrammering.nu/simple.js to ease the graphics handling in function test.
You already have what you need in your source.
<script src="http://spelprogrammering.nu/simple.js"></script>
In the html section, refer to the file that contains your javascript, I'm assuming the html file is in the same folder as that containing your script.
<script src="script.js"></script>
If the script is in a different folder...
<script src="/path/to/script.js"></script>
<script src="http://spelprogrammering.nu/simple.js"></script>
<script src="main.js"></script>
Where main.js contains your function.
I think that you say that? in this case you need to make difrent script calling your .js
<code>
<script src="http://spelprogrammering.nu/simple.js"></script>
<script src="http://spelprogrammering.nu/other.js"></script>
<script src="http://spelprogrammering.nu/other2.js"></script>

Not able to call javascript function from index.html

HI i am facing some problem while calling function from index.html on load event
it return error readjson is not defined in console.
index.html
<script type="text/javascript">
$(window).load(function () {
readjson('a','s');
});
</script>
main.js file
<script type="text/javascript">
function readjson(val1,val2){
//some code
}
</script>
Can anyone tell me why it is not able to call, i have link main.js file to index.html
JavaScript files shouldn't include any HTML.
Remove <script type="text/javascript"> and </script> from main.js.
You should see an error when that file is loaded (along the lines of Unexpected token <).
Call it like this inside the js file without the "script" tag :
function readjson(val1,val2){
//some code
}
In index.html you need the "script"
And follow the advice given in the comments, always include first the .js file and then the function in the index.html
Did you add jquery link properly??
If not, you should add jquery link for $(window) to be called. such as..
<script src="http://code.jquery.com/jquery-latest.js"></script>
If you actually have two script declarations as you are showing here the the window load will fire first. It then look for your function, which has not been created yet. That's why you are getting undefined.
You could have one script declaration on the page and place your function in the load function.
<script>
$(window).load(function () {
readjson('a','s');
function readjson(val1,val2){
//some code
}
});
</script>
Remove tags from main.js:
<script type="text/javascript"> and </script>
and remember to include jquery and main.js with:
<script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-2.1.4.min.js"></script>
<script src="test.js"></script>

Calling external function from jquery (document).ready?

I'm trying to call a function in an external file from within a HTML page using the document.ready jquery functionality. Below is the example of code from my HTML, but it does not execute the function with the code I've written.
<script type="text/javascript"src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
<script type="text/javascript" src="_js/script.js">
//<![CDATA[
$(document).ready(function(){
// What do I run here to grab external file function?
extFunction();
});
//]]/>
Example of function from external file:
function extFunction(){
alert("ALERTED!");
};
<script type="text/javascript" src="_js/script.js">
You cannot have a src attribute on a <script> tag and also have JavaScript code inside the tag. Once the src attribute is seen by the browser, it does not execute anything within the tag. Please make two separate tags...
<script type="text/javascript" src="_js/script.js"></script>
<script type="text/javascript">
//<![CDATA[
$(document).ready(function(){
// What do I run here to grab external file function?
extFunction();
});
//]]/>
</script>
You cannot have body(content) and src for a script element
<script type="text/javascript" src="_js/script.js"></script>
<script type="text/javascript">
//<![CDATA[
$(document).ready(function(){
// What do I run here to grab external file function?
extFunction();
});
//]]/>
</script>
you want to call function from a php file or js file ??
if you want to call a function of another .js file just include that file in your .js file and if you want to call a php function then use ajax.

Why will an object literal load when in declared in external source file but not when called in a file including an external javascript file file

The code in the external file is
var testing = {
bugtest: function() {
alert('No Bugs Here');
}
}
In the php file I am using
<script type="text/javascript" src="externalScript.js">
testing.bugtest();
</script>
But this will not work why?
if I call the function in the external fil it works
var testing = {
bugtest: function() {
alert('No Bugs Here');
}
}
testing.bugtest()
this will work but this not what I want it to do I want to be able to call the function in the main file? What would the cause of this problem be?
You can not use src attribute and the text node with script elements.
They must be exclusive, e.g. an element each.
So your HTML would look something like...
<script type="text/javascript" src="externalScript.js"></script>
<script type="text/javascript">
testing.bugtest();
</script>
This
<script type="text/javascript" src="externalScript.js">
testing.bugtest();
</script>
is wrong. You can either specify a src, or run inline code.

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