Monitor MouseMove

Nefarious1 · Apr 7, 2015

Hi -
I have recently been looking for some code that will allow me to monitor the mouse position for touch-screen devices. I found some code that worked, but am having problems parsing the example I found in to something more modular for my purposes. What I cant understand is why the second code example wont work ? I am guessing its something to do with scope, but any tips would be much appreciated.

===========================================================================================
CODE WORKS - BUT very "INLINE" I was trying to pull the code out in to distinct functions
===========================================================================================

Code:

<!--
To change this template, choose Tools | Templates
and open the template in the editor.
-->
<!DOCTYPE html>
<html>
    <head>
        <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <link rel="stylesheet" href="//code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.css">
  <script src="//code.jquery.com/jquery-1.10.2.min.js"></script>
  <script src="//code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.js"></script>
    </head>
    <body>
        <div id="status">x, y</div>
<script>
$( document ).ready(

function() 
{

document.addEventListener('touchmove', function(e) {
        e.preventDefault();
        $('#status').html('x='+event.touches[0].pageX + '  y= ' + event.touches[0].pageY);
    }, false);
}

);


</script>
       
    </body>
</html>

================================================================================================
SIMILAR CODE _ BUT USING DISTINCT FUNCTIONS - THIS CODE DOES NOT WORK!
===============================================================================================

Code:

<!DOCTYPE html>
<html>
    <head>
         <link rel="stylesheet" href="//code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.css">
  <script src="//code.jquery.com/jquery-1.10.2.min.js"></script>
  <script src="//code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.js"></script>
        
    </head>
<body>

<div id="status">x, y</div>

<script>
document.addEventListener('mousemove', myFunction(e));

function myFunction(e) 
{
      e.preventDefault();
        $('#status').html('x='+event.touches[0].pageX + '  y= ' + event.touches[0].pageY);
}
</script>

</body>
</html>

I dont think its due to the second attempt running outside of the "document Ready" function, but I am not sure. Anyway, any guidence would be much appreciated.

Cheers..

ChrisHirst · Apr 7, 2015

Why are you using "mousemove" rather than "touchmove" in the second example?

Chris.

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Time flies like an arrow, however, fruit flies like a banana.
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1DMF · Apr 8, 2015

I also believe you cannot use

Code:

document.addEventListener('mousemove', [highlight #FCE94F]myFunction(e)[/highlight]);

When using UDF's as arguments, if they have parentheses, they are evaluated immediately.

To get round this you have to wrap them in an anonymous function.

Code:

document.addEventListener('mousemove', function(e){myFunction(e);});

"In complete darkness we are all the same, it is only our knowledge and wisdom that separates us, don't let your eyes deceive you."

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Nefarious1 · Apr 9, 2015

OK Cheers 1DMF - very helpful.

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Monitor MouseMove

Nefarious1

Programmer

ChrisHirst

IS-IT--Management

1DMF

Programmer

Nefarious1

Programmer

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