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.

Answers:

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Method 1

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>

Method 2

You are checking for Page.IsValid where you should be checking for Page_IsValid (it’s a variable exposed by the .NET validators) 🙂

Method 3

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.

Method 4

$("input[id$=Button2]").click(function () {
    var validated = Page_ClientValidate('repo');
    if (validated) {
        // JavaScript code.
    }
});

Method 5

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.

Method 6

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
}
}

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0