Why won't my form post back after validation?

问题

I have an asp.net page with multiple validation summaries setup with ShowMessageBox="True" and several validators. I have run into a situation where when validation fails the validation summary displays correctly but then the next click that would normally trigger a postback of the page does not trigger a postback. So the steps look like this:

Click button that triggers validation.
Validation fails and a messagebox with the failure message is displayed.
Click a different button which does not validate but should trigger a postback nothing happens
Click same button as step 3 again postback happens as expected.

What could cause this behavior?

EDIT: The validation was being done in the following manner. In the asp page:

<asp:Button runat="server" id="btn" onClientClick="return DoValidation();" />

In the javascript:

function DoValidation() {
    if (!Page_ClientValidate('group1'))
        return false;
    if (!Page_ClientValidate('group2'))
        return false;

    return true;
}

回答1:

After working on this and making careful use of the debugger I finally found out that when you do validation the way described in the edit to the question a boolean is set on failure that blocks the next PostBack of the page from going through. I believe this is done when validation is being done automatically instead of explicitly as I'm doing here. Changing the javascript described above to look like this:

function DoValidation() {
    if (!Page_ClientValidate('group1')) {
        Page_BlockSubmit = false;
        return false;
    }
    if (!Page_ClientValidate('group2')) {
        Page_BlockSubmit = false;
        return false;
    }

    return true;
}

Causes the problem to go away. Hopefully this will help the next person who makes the same mistake I did.

来源：https://stackoverflow.com/questions/7769597/why-wont-my-form-post-back-after-validation

标签

ASP.NET

.net-3.5