Implementation of HTML multi-image upload preview function
Recently, I have been using the multi-image upload preview function on web pages, and I feel that it is quite good. Today, I took the time to share with you the implementation of the multi-image upload preview function based on HTML. I hope it can help everyone.
I recently wrote a script for uploading multiple images on a web page. I think it is quite practical. I won’t go into the details and just paste the code~
<head>
<style>
.pro_img{ margin-left:10px;margin-top:10px;width:300px;height: 300px;background-color: black; --border-radius:999em; overflow:hidden;float:left; --margin:5% 35%;position: relative;}
.pro_img img{ position: absolute;left: 50%;top:50%; transform: translate(-50%,-50%);width: 100%
}
.pro_img {position:relative}
.pro_img input{position: absolute;width: 100%;height: 100%;margin:0;opacity:0;z-index: 100;}
</style>
<script type="text/javascript" src="jquery.min.js"></script>
<script>
name_pic=1;
function t1(o){
//alert(name_pic);
if(o==1 || name_pic!=1){
var file="file"+o;
var img="img"+o;
var hid="hidden"+o;
var aa="a"+o;
}else{
var file="file"+name_pic;
var img="img"+name_pic;
var hid="hidden"+name_pic;
var aa="a"+name_pic;
}
var docObj = document.getElementById(file);
var imgObjPreview = document.getElementById(img);
var hidden=document.getElementById(hid);
// alert(hidden);
if (docObj.files && docObj.files[0]) {
hidden.src=window.URL.createObjectURL(docObj.files[0]); //获取file文件的路径
hidden.onload=function(){
var width=hidden.width;
var height=hidden.height;
var a=document.getElementById(aa);
if(width>height){
imgObjPreview.style.cssText='width:100%'; //重写css样式
}else{
imgObjPreview.style.cssText='height:100%;width:auto;';
}
imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]);
imgObjPreview.style.display = 'block';
}
}else{
return false;
}
if(o==name_pic){
var count=$('.pro_img').length;
if(count<6){
name_pic++;
var pic_p="<a class='pro_img' id='a"+name_pic+"' ><input type='file' id='file"+name_pic+"' accept='image/*' multiple='multiple' name='pic[]' onchange='t1("+name_pic+")'/><img src='upload.jpg' id='img"+name_pic+"' alt="Implementation of HTML multi-image upload preview function" ></a><img id='hidden"+name_pic+"' style='display:none;' alt="Implementation of HTML multi-image upload preview function" >";
$('#upload').append(pic_p);
}
}
}
</script>
</head>
<!-- multiple='multiple' -->
<form action="http://192.168.0.7/index.php/Home/Pic/upload" enctype="multipart/form-data" method="post">
<p id='upload'>
<a class='pro_img' id='a1' >
<input type='file' id='file1' accept='image/*' multiple='multiple' name='pic[]' onchange='t1(1)'/>
<img src='upload.jpg' id='img1' alt="Implementation of HTML multi-image upload preview function" ></a>
<img id='hidden1' style='display:none;' alt="Implementation of HTML multi-image upload preview function" >
</p>
<input type='submit' value="上传" />
</form> You can meet your needs by replacing some upload.png pictures yourself. If there is no response when clicking on the picture, don’t forget to add jquery
Related recommendations:
javascript implements asynchronous image upload method example
HTML5 image upload preprocessing
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