js:
/**
* 上传图片本地预览方法
* @param {Object} fileObj 上传文件file的id元素 fresh-fileToUpload
* @param {Object} previewObj 上传图片的预览id元素 fresh-send-preview-img
* @param {Object} localImg 预览图片的父层id元素 fresh-send-preview-imgvideo
*/
fs.setImagePreview =function(fileObj, previewObj, localImg) {
var docObj = document.getElementById(fileObj);
var imgObjPreview = document.getElementById(previewObj);
if (docObj.files && docObj.files[0]) {
//火狐下，直接设img属性
//火狐7以上版本不能用上面的getAsDataURL()方式获取，需要一下方式
imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]);
} else {
//IE下，使用滤镜
docObj.select();
var imgSrc = document.selection.createRange().text;
var localImagId = document.getElementById(localImg);
//必须设置初始大小
// localImagId.style.width = "120px";
// localImagId.style.height = "80px";
//图片异常的捕捉，防止用户修改后缀来伪造图片
try {
localImagId.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;
} catch (e) {
alert("您上传的图片格式不正确，请重新选择!");
return false;
}
imgObjPreview.style.display = ‘none‘;
document.selection.empty();
}
return true;
}
使用方法：
fs.fileupload = function(dom) {
var that =$(dom);
if( that.length == 0 ){
return false;
}
if (!/\.(gif|jpg|jpeg|png|GIF|JPG|PNG)$/.test(dom.value)) {
alert(‘图片格式无效！‘);
return false;
}
//显示图片预览区域
$(‘#fresh-send-preview‘).removeClass(‘hide‘);
$(‘.fresh-send-preview-imgvideo‘).find(‘img‘).attr(‘src‘, ‘http://img04.xesimg.com/loading.gif‘);
this.setImagePreview(‘fresh-fileToUpload‘, ‘fresh-send-preview-img‘, ‘fresh-send-preview-imgvideo‘);
};
html:
<div class="fresh-send-preview hide" id="fresh-send-preview">
<div class="fresh-send-preview-imgvideo" id="fresh-send-preview-imgvideo">
<img id="fresh-send-preview-img" src="img/fresh-send-img.png">
<i class="fresh-preview-close"></i>
</div>
</div>
<div class="fresh-send-upload">
<input class="fresh-fileToUpload" id="fresh-fileToUpload" type="file" size="45" name="dynImg" accept="image/*" />
</div>