The HTML Tag contains an IMG tag that is not generally known to developers. Let's talk about its attributes first:
SRC, DYNSRC, start, ALT, controls, loop, loopdelay, heatace, vspace.... Some common attributes will not be listed,
Here we will talk about the "DYNSRC" attribute: DYNSRC can be used to insert various multimedia files in the format of Wav, Avi, AIFF, AU, MP3, Ra, Ram, etc.. The URL is an audio or video file and its path, which can be a relative or absolute path.
Example:
In this way, the path of any type of file can be dynamically assigned based on DYNSRC. In JavaScript, the file size can be obtained based on The filesize attribute of the image object.. Of course, the image object also has several other attributes, such as: filecreateddate, filemodifieddate, filesize, fileupdateddate, and filters ..., Code As follows:
JavaScript code
<SCRIPT type = "text/JavaScript">
Function getfilesize (filepath)
{
VaR image = new image ();
Image. DYNSRC = filepath;
Alert (image. filesize );
}
</SCRIPT>
<Body>
<Input type = "file" name = "file" size = "30" onchange = "getfilesize (this. Value)">
</Body>
After testing, no security prompt is displayed for the file size.
(The second method can be applied to the upload control)
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