用于文件上传的Java脚本验证
[英]Java Script Validation for file uploading
问题描述
I got stuck in JavaScript validation in product adding form. 
我陷入产品添加形式的JavaScript验证中。
In that page I have file upload control to upload product image. 在该页面中，我具有文件上传控件以上传产品图片。 I am not getting how to validate that using JavaScript. 我没有得到如何使用JavaScript进行验证。
If image is not uploaded to that control I want to display Upload Image message in Label. 如果没有将图像上传到该控件，我想在“标签”中显示“ Upload Image消息。
How to accomplish this? 如何做到这一点？ Please help me. 请帮我。
The script I have written is: 我写的脚本是：
var fileup = document.getElementById('<%=FileUploadImg.ClientID %>').value;
if (fileup == "")
{
document.getElementById("lblFileUploadImg").innerHTML = "<font color='red'>
Upload Image File</font>";
document.getElementById('<%=FileUploadImg.ClientID %>').focus();
return false;
}
else
{
document.getElementById("lblFileUploadImg").innerHTML = "";
}
The control I have used is: 我使用的控件是：
<asp:FileUpload ID="FileUploadImg" runat="server" Width="217px" Height="20px" />
<asp:Label ID="lblFileUploadImg" runat="server" >
3 个解决方案
解决方案1
0 2014-03-24 09:03:25
With jQuery you could simply do this: 使用jQuery，您可以简单地做到这一点：
$('#myFile').bind('change', function() {
if(this.files[0].size>...){
alert('File is too big');
};
});
maybe this is what you are looking for: 也许这就是您想要的：
$("input:file").change(function () {
if ($(this).val() !== "") {
var ul_file = $(this).val();
var extension = ul_file.substr((ul_file.lastIndexOf('.') + 1));
var accepted_file_endings = ["jpg", "jpeg", "bmp", "gif", "tif", "png"];
extension = extension.toLowerCase()
if ($.inArray(extension, accepted_file_endings) !== -1) {
...
解决方案2
0 2014-03-24 09:13:55
You can get validate file uploading using JavaScript like this. 您可以像这样使用JavaScript获取验证文件上传。
<script type="text/javascript">
function validate() {
var uploadcontrol = document.getElementById('<%=FileUploadImg.ClientID%>').value;
//Regular Expression for fileupload control.
var reg = /(.doc|.docx|.pdf)$/i;
if (uploadcontrol.length > 0)
{
//Checks with the control value.
if (reg.test(uploadcontrol))
{
document.getElementById('<%=lblFileUploadImg.ClientID%>').innerHTML = "<font color='green'>Upload Image File</font>";
return true;
}
else
{
//If the condition not satisfied shows error message.
document.getElementById('<%=lblFileUploadImg.ClientID%>').innerHTML = "Error while upload image";
return false;
}
}
} //End of function validate.
</script>
<asp:FileUpload ID="FileUploadImg" runat="server" Width="217px" Height="20px" />
<asp:Label ID="lblFileUploadImg" runat="server" />
<asp:Button runat="server" Text="Upload" ID="btnupload" onclientclick="return validate();" />
解决方案3
0 2014-03-24 09:21:57
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script>
function Validate() {
var fileup = document.getElementById('<%=FileUploadImg.ClientID %>').value;
if (fileup == "") {
document.getElementById('<%=lblFileUploadImg.ClientID%>').innerHTML = "<font color='red'>Upload Image File</font>";
document.getElementById('<%=FileUploadImg.ClientID %>').focus();
return false;
}
else {
document.getElementById('<%=lblFileUploadImg.ClientID%>').innerHTML = "";
return true;
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUploadImg" runat="server" />
<asp:Label ID="lblFileUploadImg" runat="server" Text="Label"></asp:Label>
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="return Validate();" />
</div>
</form>
</body>
</html>
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