Native JS for instant preview code

Last Update:2016-10-22 Source: Internet

Author: User

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<! DOCTYPE html>
<meta charset= "Utf-8" >
<title> Upload Images </title>
<style>
body,div,img{
margin:0 Auto;
padding:0;
}
html{
width:100%;
height:100%;
}
body{
line-height:20px;
Font-family: "Microsoft Jas Black";
width:1000px;
height:100%;
Background-color: #000;

}
. upload-img{
position:relative;
Text-align:center;
line-height:300px;
Float:left;
margin-top:100px;
Background-color: #fff;
Color: #333;
font-size:30px;
width:300px;
height:300px;
margin-left:15px;
margin-right:15px;
}
. upload-img. imgs{
Position:absolute;
left:0;
top:0;
width:100%;
height:100%;
}
. upload-img:hover{
Color: #f90;
}
. upload-img. btn{
width:100%;
height:100%;
opacity:0;
Filter:alpha (opacity=0);
Z-index:2;
Position:absolute;
left:0;
top:0;
Cursor:pointer;
}
</style>
<body>
<div class= "Upload-img" >
Upload image
<input type= "File" class= "btn" onchange= "uploadimg (this,1);"/>
</div>
<div class= "Upload-img" >
Upload image
<input type= "File" class= "btn" onchange= "uploadimg (this,2);"/>
</div>
<div class= "Upload-img" >
Upload image
<input type= "File" class= "btn" onchange= "uploadimg (this,3);"/>
</div>
<script>
Upload image
function Uploadimg (that,num) {
var Parentnode=that.parentnode;
var images=parentnode.getelementsbytagname ("img");
if (images.length==0) {
Createimg (Parentnode,num);
}
var Img=document.getelementbyid ("img" +num);
var f=that.files;
if (F&&f[0]) {
Checkedimg (THAT,F,IMG);
}else{
Compatible with IE
var Srcval=that.value;
if (!srcval) {
Alert ("You performed a cancel operation");
Img.setattribute ("src", "");
Srcval= "";
}else{
var houzui=srcval.substr (Srcval.lastindexof ("."))
. replace (".", "");
if (houzui== "jpg" | | houzui== "JPEG") {
Img.setattribute ("src", srcval);
}else{
Alert ("Please upload a picture with suffix jpg,jpeg format");
Img.setattribute ("src", "");
Srcval= "";
}
}

}
}
Create a picture
function Createimg (parentnode,num) {
var imgelement=document.createelement ("img");
Imgelement.classname= "IMGs";
Imgelement.id= "img" +num;
Parentnode.appendchild (imgelement);
}
Determine the type of picture, size
function Checkedimg (that,f,img) {
Type of picture
if (f[0].type== "Image/jpeg") {
Image size cannot exceed 3M
if (f[0].size/1024/1024<3) {
var Imgsrc=window. Url.createobjecturl (That.files[0]);
Img.setattribute ("src", imgsrc);
}else{
Alert ("Upload image size cannot exceed 3M");
Empty file fields
F=[];
Img.setattribute ("src", "");
return false;
}
}else{
Alert ("Please upload a picture with suffix jpg,jpeg format");
Empty file fields
F=[];
Img.setattribute ("src", "");
return false;
}
}
</script>
</body>

Native JS for instant preview code

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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Native JS for instant preview code

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