asked on

Get image site in javascrip

Hi E's,
I try to get the height of a image using this code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>Untitled Document</title> 
</head> 
<body> 
<img src="../../imagem/jpg640x480/DSC_2576.jpg"/>
<script>
var x = document.getElementById('img').height;
alert(x);
</script>
</body> 
</html>

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but not work, what is wrong?

The best regards, JC

Tom Beck

What you have should work. What browser are you using?

It works in Firefox but not in Safari in my tests so far.

Tom Beck

One way to do this is with jquery. For example, this works in Safari, Chrome and Firefox in my tests.

<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.2/jquery.js"></script>
<script>

$("#img").one("load", function(){
    var img = this;
    setTimeout(function(){
        alert(img.height);
    }, 30);
});

</script>

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Tom Beck

Javascript way:

<script>
window.addEventListener('load', function(){
  var x = document.getElementById('img').height;
  alert(x);
});
</script>

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Pedro Chagas

ASKER

Hi Tom,
I have test in Safari.
When I going home, I will test your solutions.
Thank you.

The best regards, JC

Sar1973

Try: var x= document.getElementById("img").style.height;

DualCool

make sure you give your image a height

<img id="imageID" src="path.png" style="height:299px;"/>

Pedro Chagas

ASKER

HI,
I see all the solutions, and I conclude javascript cant get the size of images, based only in the image, without style. If the image don't have any style associated, is impossible to js determinate the size of the image! Please tell me if I'm wrong.
When I try to know if js can get the size of the images, the objective is create a script for detect if the image is loaded or not loaded. Maybe this not was the correct path to that objective.
What should I do?

The best regards, JC

DualCool

there is no good way of doing that - what I do is preload the images in an on load function

Sar1973

Have you tried alert(document.getElementById("imageID").style.height;) ?

SOLUTION

Tom Beck

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SOLUTION

DualCool

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Pedro Chagas

ASKER

Hi Tom, you give a hope.
I try your last solution in two ways:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>Untitled Document</title> 
</head> 
<body> 
<div id="img"><img src="../../imagem/jpg640x480/DSC_2576.jpg"/></div>
<script>
window.addEventListener('load', function(){
  var x = document.getElementById('img').height;
  alert(x);
});
</script>
</body> 
</html>

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The result of was 'undefined'.

The second way:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>Untitled Document</title> 
</head> 
<body> 
<img src="../../imagem/jpg640x480/DSC_2576.jpg"/>
<script>
window.addEventListener('load', function(){
  var x = document.getElementById('img').height;
  alert(x);
});
</script>
</body> 
</html>

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alert not work.

My knowledge in js is poor, so I want ask you, if you can, how you use your code in my initial code.

The best regards, JC

Pedro Chagas

ASKER

Hi @DualCool, I don't do a refresh in this page, and I don't see your last comment. Thanks for your comment and help.
I want to see the correct code running to analyze your solution.
If you can help also, I appreciate. Thanks.

The best regards, JC

ASKER CERTIFIED SOLUTION

DualCool

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Pedro Chagas

ASKER

Hi @Sar1973, your solution not work, you can see the alert in the attach image (is empty). I try in FF and i.e.11. Anyway, thanks for trying to help.

Hi @DualCool, thank you.
I try in Safari 5.1.2 and work, also i.e. 11 and chrome 32.0.1700.107 m.
Not work in i.e.5, 6, 7, 8 and 9.
In fact, it is a bit viable solution.
Thank you all for the excellent help.

The best regards, JC