Determine if page is valid in JavaScript - ASP.NET

What is the best way to determine if a form on an ASPX page is valid in JavaScript?

I am trying to check the validation of an user control that was opened using the JavaScript window.showModalDialog() and checking the 'Page.IsValid' property on the server side does not work. I am using ASP.NET validation controls for page validation.

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You can use jQuery and the Validation plugin to perform client side validation. This will work with both html tags and asp.net server controls. Phil Haack has a good sample project that will show you the basics.

This SO question has an in depth review of this approach as well.

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The ASP.NET validation controls expose a client side API you can use with javascript: http://msdn.microsoft.com/en-us/library/aa479045.aspx

You should be able to check the Page_IsValid object to see if any of the validation controls are invalid.

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最佳答案

If I have a page that is using a bunch of ASP.NET validation controls I will use code similar to the following to validate the page. Make the call on an input submit. Hopefully this code sample will get you started!

    <input type="submit" value="Submit" onclick"ValidatePage();" />


<script type="text/javascript">


function ValidatePage() {


if (typeof (Page_ClientValidate) == 'function') {
Page_ClientValidate();
}


if (Page_IsValid) {
// do something
alert('Page is valid!');
}
else {
// do something else
alert('Page is not valid!');
}
}


</script>
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You are checking for Page.IsValid where you should be checking for Page_IsValid (it's a variable exposed by the .NET validators) :)

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$("input[id$=Button2]").click(function () {
var validated = Page_ClientValidate('repo');
if (validated) {
// JavaScript code.
}
});
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Set ValidationGroup property for each asp.net validator control in your page, you have to provide same name to ValidationGroup in a page.

For example:

<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Required" ValidationGroup="Validate"></asp:RequiredFieldValidator>
<asp:RangeValidator ID="RangeValidator1" runat="server" ErrorMessage="RangeValidator" ValidationGroup="Validate"></asp:RangeValidator>
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="CustomValidator" ValidationGroup="Validate"></asp:CustomValidator>

After that in your javascript call like Page_ClientValidate("ValidationGroup")

For example:

function ValidatePage(){
if(Page_ClientValidate("Validate")){ //validate using above validation controls group
//validation return true section
}
else{
//validation return false section
}
}

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