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Implementing multi-image upload preview function based on HTML

高洛峰Original: 2017-02-10 10:19:301366browse

Recently, I have been using the multi-image upload preview function on web pages, and I feel that it is quite good. Today I take the time to share with you the multi-image upload preview function based on HTML. Let’s take a look.

I have recently written I made a script for uploading multiple images on a web page. It feels very practical. I won’t go into the details. I’ll 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;></a><img  id=&#39;hidden"+name_pic+"&#39; style=&#39;display:none;&#39;>";
    $(&#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;></a>
<img  id=&#39;hidden1&#39; style=&#39;display:none;&#39;>
</p>
<input type=&#39;submit&#39; value="上传" />
</form>

Replace some upload.png by yourself This picture can meet your needs. If there is no response when clicking on the picture, don't forget to add jquery

The above is the editor's introduction to the multi-image upload preview function based on HTML. I hope it will be helpful to everyone. It's helpful. If you have any questions, please leave me a message and I will reply to you in time. I would also like to thank you all for your support of the PHP Chinese website!

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