Simple image click upload function-JS Tutorial-php.cn

Simple image click upload function

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Release： 2018-03-08 11:14:18

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This time I will bring you a simple click-to-upload function for pictures, and make a simple click-to-upload function for pictures. What are the things to note? The following is a practical case, let’s take a look.

Simple image click upload preview example. Chrome, Firefox and other browsers can support drag and drop preview

<!DOCTYPE>
<html>
  
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <script type="text/javascript"> 
//--从 file 域获取 本地图片 url
function getFileUrl(sourceId) {
    var url;
    if (navigator.userAgent.indexOf("MSIE")>=1) { // IE
        url = document.getElementById(sourceId).value;
    } else if(navigator.userAgent.indexOf("Firefox")>0) { // Firefox
        url = window.URL.createObjectURL(document.getElementById(sourceId).files.item(0));
    } else if(navigator.userAgent.indexOf("Chrome")>0) { // Chrome
        url = window.URL.createObjectURL(document.getElementById(sourceId).files.item(0));
    }
    return url;
}
var ss=null
var ImgType=["gif", "jpeg", "jpg", "bmp", "png","ico"];
//--将本地图片 显示到浏览器上 
function preImg(obj, targetId) { 
    ss=obj;
        if (!RegExp("\.(" +  ImgType.join("|") + ")$", "i").test(obj.value.toLowerCase())) {
            alert("选择文件错误,图片类型必须是" +  ImgType.join(","));
            this.value = "";
            return false
        }
    var sourceId=obj.id
    var url = getFileUrl(sourceId);
    var imgPre = document.getElementById(targetId);
    imgPre.src = url;
      
} 
</script>
</head>
  
<body>
    <form action="">
        <label style="position: relative;width:100px;height:100px;display: block;line-height:100px; " align="center">
             <input type="file"  accept="image/*" name="imgOne" id="imgOne" onchange="if(this.value){preImg(this, &#39;imgPre&#39;);}" style="height: 100%;width: 100%;position: absolute;z-index: 9;left: 0;right: 0;opacity: 0;"/>
             <img id="imgPre" src=""   style="display: block;position: absolute;width:100%;height:100%;border: 1px solid #999;"/>
             上传图片
        </label> 
    </form>
</body>
  
</html>

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I believe you have mastered the method after reading the case in this article. For more exciting content, please pay attention to other related articles on the PHP Chinese website!