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JS script determines the size and file type method instance on the client side

小云云Original: 2018-03-12 16:08:471330browse

This article mainly shares with you examples of JS scripts to determine the size and file type on the client side. Use JS scripts to determine the size and file type on the client side! Compatible with ie6, ie7, ie8, Google Chrome, ff and other browsers, I hope it can help everyone.

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript">
var isIE = /msie/i.test(navigator.userAgent) && !window.opera;
function fileChange(target,id) {
var fileSize = 0;
var filetypes =[".jpg",".png",".rar",".txt",".zip",".doc",".ppt",".xls",".pdf",".docx",".xlsx"];
var filepath = target.value;
var filemaxsize = 1024*2;//2M
if(filepath){
var isnext = false;
var fileend = filepath.substring(filepath.indexOf("."));
if(filetypes && filetypes.length>0){
for(var i =0; i<filetypes.length;i++){
if(filetypes[i]==fileend){
isnext = true;
break;
}
}
}
if(!isnext){
alert("不接受此文件类型！");
target.value ="";
return false;
}
}else{
return false;
}
if (isIE && !target.files) {
var filePath = target.value;
var fileSystem = new ActiveXObject("Scripting.FileSystemObject");
if(!fileSystem.FileExists(filePath)){
alert("附件不存在，请重新输入！");
return false;
}
var file = fileSystem.GetFile (filePath);
fileSize = file.Size;
} else {
fileSize = target.files[0].size;
}

var size = fileSize / 1024;
if(size>filemaxsize){
alert("附件大小不能大于"+filemaxsize/1024+"M！");
target.value ="";
return false;
}
if(size<=0){
alert("附件大小不能为0M！");
target.value ="";
return false;
}
}
</script>
</head>
<body>
<input type="file" name="contractFileName" style="width: 500px;" onchange="fileChange(this);"/>
</body>
</html>

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