"Grant Wagner" <gw*****@agricoreunited.com> wrote in message
news:41***************@agricoreunited.com...
Ken wrote:
I would like to measure the fileSize of the image (without uploading
it - php).
I use:
var size_pic = document.getElementById('num1').childNodes[0].fileSize;
alert("size = " + size_pic);
which works on IE with one exception.
With a first time displayed image, the script displays a size= -1 The
image is displayed on the first pass. The fileSize script is located after
the img script.
var image_display=document.createElement('img');
image_display.src='file://' + field;
image_display.name = 'pict';
document.getElementById('num1').appendChild(image_ display);
The second pass is correct. size = 11479
Is this a cache problem? The first pass caches the file, the second
pass reads the file?
No, the problem is that the file has not yet loaded by the time you
attempt to access it's size. Make the display of it's size dependant on the onload
event of the image.
var image_display=document.createElement('img');
image_display.onload = function() {
alert(this.fileSize);
}
image_display.src='file://' + field;
image_display.name = 'pict';
document.getElementById('num1').appendChild(image_ display);
Of course, you'll need to replace alert(this.fileSize) with something more
useful, perhaps create another node under the image and display the size
there.
--
Grant Wagner <gw*****@agricoreunited.com>
comp.lang.javascript FAQ - http://jibbering.com/faq
Grant,
This works but not like I want.
I am trying to determine the file size to test for size < max spec. The
script works for the first image but not for a second image which replaces
the first image if it is over spec.
Removing the onload... the script works but will not measure fileSize on the
first pass.
Any suggestions.
Ken
<input type=file size=65 name="picture1" onChange="image_size(this.value);"
Id="pt1">
<div id="image_size_display"></div>
<script type="text/javascript">
// Image size to be under max limit
function image_size(field){
if ((document.createElement) && (document.getElementById)) {
var image_display=document.createElement('img');
image_display.onload = function() { image_size = this.fileSize; }
image_display.src='file://' + field;
image_display.name = 'pict';
image_display.alt = 'image';
document.getElementById('image_size_display').appe ndChild(image_display);
alert("image_size = " + image_size);
if(image_size >2000000){alert("This picture ( file ) is geater than
2,000,000.\n\n" + "Select another picture or reduce the size of the picture
( file )")};
alert("test");
document.getElementById('image_size_display').remo veChild(image_display);
} }
</script>
