简易图片点击上传预览示例。chrome,火狐等浏览器下可支持拖拽预览 1. [代码] [HTML]代码 !DOCTYPEhtmlhead meta http-equiv="Content-Type" content="text/html; charset=utf-8" script type="text/javascript" //--从 file 域
1. [代码][HTML]代码
<!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, 'imgPre');}" 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>