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Implementation of HTML multi-image upload preview function

小云云

Dec 11, 2017 am 10:48 AM

htmlFunctionaccomplish

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=&#39;width:100%&#39;;   //重写css样式
                }else{
                imgObjPreview.style.cssText=&#39;height:100%;width:auto;&#39;;                  
                }
        imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]);
        imgObjPreview.style.display = &#39;block&#39;;
        }
    }else{
        return false;
    }
    if(o==name_pic){
        var count=$(&#39;.pro_img&#39;).length;
        if(count<6){
        name_pic++;
    var pic_p="<a class=&#39;pro_img&#39; id=&#39;a"+name_pic+"&#39; ><input type=&#39;file&#39; id=&#39;file"+name_pic+"&#39;  accept=&#39;image/*&#39; multiple=&#39;multiple&#39; name=&#39;pic[]&#39; onchange=&#39;t1("+name_pic+")&#39;/><img  src=&#39;upload.jpg&#39; id=&#39;img"+name_pic+"&#39; alt="Implementation of HTML multi-image upload preview function" ></a><img   id=&#39;hidden"+name_pic+"&#39; style=&#39;display:none;&#39; alt="Implementation of HTML multi-image upload preview function" >";
    $(&#39;#upload&#39;).append(pic_p); 
    }       
}
}
</script>
</head>
<!-- multiple=&#39;multiple&#39; -->
<form action="http://192.168.0.7/index.php/Home/Pic/upload" enctype="multipart/form-data" method="post">
<p id=&#39;upload&#39;>
<a class=&#39;pro_img&#39; id=&#39;a1&#39; >
<input type=&#39;file&#39; id=&#39;file1&#39;  accept=&#39;image/*&#39; multiple=&#39;multiple&#39; name=&#39;pic[]&#39; onchange=&#39;t1(1)&#39;/>
<img  src=&#39;upload.jpg&#39; id=&#39;img1&#39; alt="Implementation of HTML multi-image upload preview function" ></a>
<img   id=&#39;hidden1&#39; style=&#39;display:none;&#39; alt="Implementation of HTML multi-image upload preview function" >
</p>
<input type=&#39;submit&#39; 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

php, ajax and h5 implement image upload function example

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