ive a form with a image , button and textbox. ive to resize the images height and width to what ever is entered in the textbox, when the button is clicked. My image just disappears when the button is clicked.
heres my code
<!DOCTYPE HTML>
<html>
<head>
<title>Resize Image</title>
</head>
<body>
<script>
function resizeimage()
{
var theImg = document.getElementById('image');
theImg.height = size;
theImg.width = size;
}
var size=parseInt(document.getElementById('txtbox'));
</script>
<form name ="ResizeImage">
<img src = "cookie.jpg" id="image">
</br>
<input type=button value="Resize" onclick="resizeimage()">
</br>
<input type=text id="txtbox"
</form>
</body>
</html>
Apart from the HTML problems (please run it through the validator), the main problem is that the part of code that reads the size of the image is outside of the function. On page load, this is what happens.
resizeimage() is definedsize is set to whatever is in the input at that pointAt 2. the input doesn't even exist yet because 3. isn't done yet, so var size is set to undefined. It never changes after that, because the function resizeimage() does not try to read the size of the image again.
Also, document.getElementById returns an element. You will have to read what the user put into it by using it's .value property
Try this:
function resizeimage()
{
var size=parseInt(document.getElementById('txtbox').value);
var theImg = document.getElementById('image');
theImg.height = size;
theImg.width = size;
}
Working example: http://jsfiddle.net/KZH5p/
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments