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JS Get picture Size Code Summary

Source: Internet
Author: User
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Get the length and width of a picture

  code is as follows copy code
 
 <script>
        function GetImageSize (imge) {
             var i = new Image () ; Create a new Picture object
              i.src = imge.src;// Assign the Src property of a picture to the SRC
for the new picture object               return new Array (i.width,i.height);
       } 
</script>

Call Mode:

The code is as follows Copy Code

<script>
var imagee = document.getElementById ("Imagee"),
ImageSize = getimagesize (Imagee),
ImgWidth = Imagesize[0],
ImgHeight = imagesize[1];
Test mode:
Console.log (ImgWidth);
Console.log (ImgHeight);
</script>

get picture size kb,mb form

  code is as follows copy code

<input type= "file" onchange= "Checksize ()" id= "F"/>

<script Type= "Text/javascript"

var ie=!-[1,];  //Distinguishing IE

Function checksize () {

var f= Document.getelementbyidx_x ("F");

if (IE) {

var img=new Image ();//Dynamically create IMG

Img.src=f.value;

Img.style.display= "None";

Img.onreadystatechange=function () {

if (img.readystate== ' complete ') {//When picture load complete

Alert ( img.filesize);//ie get file size

}

}

Document.body.removeChlid (IMG);//Get size end, remove picture

}

Else {

var fv=f.files[0].size;//firefox, and other standard value methods

Alert (FV);

}

}

</script>

Based on the above example, let's do a preview of the image before uploading it using the Get Picture size feature.

The code is as follows Copy Code

<HTML>
<HEAD>
<TITLE> demo picture and so on scale shrink </TITLE>
<script>
function Wa_setimgautosize (IMG)
{
var img=document.all.img1;//get Pictures
var maxwidth=200;//set Picture width limit
var maxheight=100;//set Picture height limit
var heightwidth=img.offsetheight/img.offsetwidth;//set aspect ratio
var widthheight=img.offsetwidth/img.offsetheight;//set ratio of width to height
Alert ("Test" +img.offsetheight+img.filesize);
if (img.offsetheight>1) alert (img.offsetheight);
if (img.readystate!= "complete") {
Return false;//ensure the picture is fully loaded
}

if (img.offsetwidth>maxwidth) {
Img.width=maxwidth;
Img.height=maxwidth*heightwidth;
}
if (img.offsetheight>maxheight) {
Img.height=maxheight;
Img.width=maxheight*widthheight;
}
}

function Checkimg (IMG)
{
var message= "";
var maxwidth=1;//set Picture width limit
var maxheight=1;//set Picture height limit

if (img.readystate!= "complete") {
Return false;//ensure the picture is fully loaded
}
if (img.offsetheight>maxheight) message+= "R height Excess:" +img.offsetheight;
if (img.offsetwidth>maxwidth) message+= "R width Excess:" +img.offsetwidth;
if (message!= "") alert (message);
}
</script>
</HEAD>
<BODY>

<br>
<input id=inp type= "file" onpropertychange= "Img1.src=this.value;" >
</BODY>
</HTML>

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