一、上传并显示
HTML
<div id="swf" style="margin: 0 auto;text-align: center;">
<img src="/assets/img/default.jpg" height="180px" width="180px"
id="logoshow">
</div>
<div id="headview" style="text-align: center;margin: 0 auto;">
<input type="file" id="logo" name="logo" style="width: 180px;"
onchange="previewImage(this)">
</div>
JS
function previewImage(file){
var div = document.getElementById('swf');
if (file.files && file.files[0]) {//HTML5
var img = document.getElementById('logoshow');
var reader = new FileReader();
reader.readAsDataURL(file.files[0]);
reader.onload = function (evt) {
img.src = evt.target.result;
img.style.width= "180px";
};
}
else //兼容IE，滤镜
{
alert("filter");
var sFilter = 'filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
file.select();
file.blur();
var src = document.selection.createRange().text;
var img = document.getElementById('logoshow');
img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
div.innerHTML = "<img id=logoshow style='margin:0px auto;width:180px;height:180px;" + sFilter + src + "\"'>";
}
}
二、判断大小，IE10才有file功能
JS判断文件大小
<input id="file" type="file" onchange="filefujianChange(document.getElementById('file'))">
<script type="text/javascript">
function filefujianChange(target) {
var fileSize = 0;
if (!target.files) {
var filePath = target.value;
var fileSystem = new ActiveXObject("Scripting.FileSystemObject");
var file = fileSystem.GetFile (filePath);
fileSize = file.Size;
} else {
fileSize = target.files[0].size;
}
var size = fileSize / 1024;
alert(size);
if(size>2000){
alert("附件不能大于2M");
target.value="";
return
}
var name=target.value;
var fileName = name.substring(name.lastIndexOf(".")+1).toLowerCase();
alert(fileName);
if(fileName !="jpg" && fileName !="jpeg" && fileName !="pdf" && fileName !="png" && fileName !="dwg" && fileName !="gif" ){
alert("请选择图片格式文件上传(jpg,png,gif,dwg,pdf,gif等)！");
target.value="";
return ;
}
}
</script>
