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基于HTML如何做出多图上传预览效果

php中世界最好的语言原创: 2018-01-20 09:21:572105浏览

这次给大家带来基于HTML如何做出多图上传预览效果，基于HTML做出多图上传预览效果的注意事项有哪些，下面就是实战案例，一起来看一下。

自己最近写了一个网页多图上传的脚本,感觉挺实用的,细节就不要说了,直接贴代码了~

<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_div="<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_div);
    }      
}
}
</script>
</head>
<!-- multiple=&#39;multiple&#39; -->
<form action="http://192.168.0.7/index.php/Home/Pic/upload" enctype="multipart/form-data" method="post">
<div 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;>
</div>
<input type=&#39;submit&#39; value="上传" />
</form>

自己替换一些upload.png这张图片就能达到自己的需求,如果说图片点击没反应,别忘了加入jquery

相信看了这些案例你已经掌握了方法，更多精彩请关注php中文网其它相关文章！