JS Picture Verification Size

Verify file size only, do not validate pixels

<script>

function Check () {

var size= upload file control. Postedfile.contentlength; Get the size of the uploaded file

if (size>120) {

Alert ("Picture is greater than 120kb");

return false;

}

}

</script>

Verify pixel size

<input name= "txtimg" type= "file" id= "Txtimg"/>
<input name= "btnuploadimg" type= "button" id= "btnuploadimg" value= "Upload"/>
<span class= "Redcolor" > (Best Picture size: Width not exceeding 600 pixels, height not exceeding 600 pixels) </span>

<script language= "JavaScript" >
var allowimgfilesize=512; Allow upload of picture file size 0 for unrestricted units: KB
var allowimgwidth=600; The width of the allowed image to be uploaded is 0 unrestricted: px (pixels)
var allowimgheight=600; The height of the image allowed to upload is 0 unrestricted: px (pixels)

function checkimg () {
var Txtimg=document.getelementbyid ("Txtimg");
if (txtimg.value== "") {
Alert ("Click the browse button, select the JPG or GIF file you want to upload!");
Txtimg.focus ();
return false;
}
&NBSP;
   var txtimg_url=txtimg.value.tolowercase ();
   var txtimg_ext=txtimg_url.substring (txtimg_url.length-3,txtimg_url.length);
   if (txtimg_ext!= "JPG" && txtimg_ext!= "gif") {
    alert ("Please select files in jpg or GIF format!");
    txtimg.select ()
    document.execcommand ("Delete");
    Txtimg.focus ();
     return false;
 }
  var errmsgerrmsg = "";//error message
  var img=new Image ();
  Img.src=txtimg.value;
 &NBSP;
  if (Img.width > Allowimgwidth) {
   Errmsgerrmsg= "\ n \ nthe picture width exceeds the limit please upload the width less than" +allowimgwidth+ "px file, the current picture width is" +img.width+ "px"; &NBSP;
  alert (errmsgerrmsg);   return false;
 

if (Img.height > Allowimgwidth) {
Errmsgerrmsg= "\ n \ nthe picture height exceeds the limit please upload the file height less than" +allowimgheight+ "px, the current picture height is" +img.height+ "px";&NBSP;
   alert (errmsgerrmsg);    return false;
 
 &NBSP;
  var size = Formatnum (img.filesize/1024,2);
  if (Size > Allowimgfilesize)   {
  errmsgerrmsg = "\ n \ nthe picture file size exceeds the limit please upload less than" +allowimgfilesize+ " KB of files, the current file size is "+size+" KB "; &NBSP;
  alert (errmsgerrmsg);   return false;
 }

Alert (' ok! ');
return true;
}

</script>

JS Picture Verification Size