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I got the following code on w3school :

<!DOCTYPE html>
<html>
<head>
<script>
function changetext(id)
{
id.innerHTML="Ooops!";
}
</script>
</head>
<body>
<h1 onclick="changetext(this)">Click on this text!</h1>
</body>
</html>

This is working well. Now for the sake of practice, I want want to do it by an external js file. My codes are as follows Html :

<!DOCTYPE html>
<html>
<body>

<p>Click the button to execute the <em>displayDate()</em> function.</p>

<button >Try it</button>


<p id="demo"></p>
<script src="function.js"></script>
</body>
</html>

My js file:

function displayDate()
{
    document.getElementById("demo").innerHTML=Date();
}
onclick='displayDate()';

But above code is not working. What should I do for this.

I got the following code on w3school :

<!DOCTYPE html>
<html>
<head>
<script>
function changetext(id)
{
id.innerHTML="Ooops!";
}
</script>
</head>
<body>
<h1 onclick="changetext(this)">Click on this text!</h1>
</body>
</html>

This is working well. Now for the sake of practice, I want want to do it by an external js file. My codes are as follows Html :

<!DOCTYPE html>
<html>
<body>

<p>Click the button to execute the <em>displayDate()</em> function.</p>

<button >Try it</button>


<p id="demo"></p>
<script src="function.js"></script>
</body>
</html>

My js file:

function displayDate()
{
    document.getElementById("demo").innerHTML=Date();
}
onclick='displayDate()';

But above code is not working. What should I do for this.

  • javascript
  • html
Share Improve this question edited Apr 19, 2014 at 9:27 jahan asked Apr 19, 2014 at 9:11 jahanjahan 5211 gold badge4 silver badges16 bronze badges 3
  • YOu cant right like this - onclick='displayDate()'; in js file – Butani Vijay Commented Apr 19, 2014 at 9:15
  • Thanks.. What should I do for this.. – jahan Commented Apr 19, 2014 at 9:21
  • CHeckout answer given by @Maurice – Butani Vijay Commented Apr 19, 2014 at 10:47
Add a ment  | 

2 Answers 2

Reset to default 5

This is often done with an ID on the button. To ensure the DOM is loaded when the script is executed, it is done in a load handler.

html:

<!DOCTYPE html>
<html>
<head>
    <script src="function.js"></script>
</head>
<body>

   <p>Click the button to execute the <em>displayDate()</em> function.</p>

   <button id="myButton">Try it</button>

   <p id="demo"></p>

</body>
</html>

function.js:

function displayDate()
{
    document.getElementById("demo").innerHTML=Date();
}

window.onload = function() {
    var btn = document.getElementById("myButton");
    btn.onclick = displayDate;
}

<!DOCTYPE html>
<html>
<body>

<p>Click the button to execute the <em>displayDate()</em> function.</p>

<button id="try it" onclick='displayDate()' >Try it</button>


<p id="demo"></p>
<script src="function.js"></script>
</body>
</html>

js file

    function displayDate()
{
    document.getElementById("demo").innerHTML=Date();
}

本文标签： htmlHow to use onclick in an external javascript fileStack Overflow

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