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用javaScript获取文件，jpg图片大小

2008-08-05 15:47 471 查看

<HTML>

<HEAD>

<SCRIPT>

function getImageDimension (imgURL, loadHandler) {

var img = new Image();

img.onload = loadHandler;

if (document.layers

&& location.protocol.toLowerCase() != 'file:'

&& navigator.javaEnabled())

netscape.security.PrivilegeManager.enablePrivilege(

'UniversalFileRead'

);

img.src = imgURL;

}

function getFileSize (fileName) {

if (document.layers) {

if (navigator.javaEnabled()) {

var file = new java.io.File(fileName);

if (location.protocol.toLowerCase() != 'file:')

netscape.security.PrivilegeManager.enablePrivilege(

'UniversalFileRead'

);

return file.length();

}

else return -1;

}

else if (document.all) {

window.oldOnError = window.onerror;

window.onerror = function (err) {

if (err.indexOf('utomation') != -1) {

alert('file access not possible');

return true;

}

else

return false;

};

var fso = new ActiveXObject('Scripting.FileSystemObject');

var file = fso.GetFile(fileName);

window.onerror = window.oldOnError;

return file.Size;

}

}

function showImageDimensions () {

alert(this.width + 'x' + this.height);

}

</SCRIPT>

<SCRIPT>

function checkImageDimensions (fileName) {

var imgURL = 'file:///' + fileName;

getImageDimension(imgURL, showImageDimensions);

}

</SCRIPT>

</HEAD>

<BODY>

<FORM NAME="formName">

<INPUT TYPE="file" NAME="fileName">

<BR>

<INPUT TYPE="button" VALUE="check file size"

ONCLICK="alert(getFileSize(this.form.fileName.value))"

>

<BR>

<INPUT TYPE="button" VALUE="check image dimensions"

ONCLICK="checkImageDimensions(this.form.fileName.value)"

>

</FORM>

</BODY>

</HTML>

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