CODEWITHSUNDEEP
javascriptasp.netvalidationpostback
Bartyk
Bartyk

Reputation: 89

How to do validation before postback?

I have custom control with ASP.Net validators.

writer.AddAttribute(HtmlTextWriterAttribute.Onclick, "javascript:return DoSmth();");

function DoSmth() {
var cBox = confirm("Are you sure?");
if (!cBox) {
    return false;
}
else {
//Invoke validation
}

When I push button submit, I call confirm box. If I press cancel - all right. But if I press ok, I need to do validation. How can I stop postback and do valiadation?

Upvotes: 2

Views: 4055

Answers (2)

Oleks
Oleks

Reputation: 32343

Call client-side Page_ClientValidate(validationGroup). It returns true if the page was valid.

function DoSmth() {
    var cBox = confirm("Are you sure?");
    if (!cBox) {
        return false;
    }
    else {
        return Page_ClientValidate(validationGroup);
    }
}

EDIT(an answer to a comment):

validationGroup here is a string variable, and it is not necessary to pass it to DoSmth function (honestly, the answer should be: it depends).

If this function is defined in a .js file, then yes, validationGroup should be passed as an argument.

If it is a part of the page/control it would be easier to use e.g. server side constructions here:

return Page_ClientValidate('<%= btnSubmit.ValidationGroup %>');

where btnSubmit is a button which causes validation, or use just a string variable.

Upvotes: 4

Bryan Weaver
Bryan Weaver

Reputation: 4473

I am not sure if you can stop a postback with ASP.Net Validation. From MSDN:

"Validation occurs after page initialization (that is, after view state and postback data have been processed) but before any change or click event handlers are called. "

I use jQuery Validation and then check the value in the same method as the confirm dialog.

function DoSmth() {

$('#form1').validate({
                rules: { field: "required" }
            });


var cBox = confirm("Are you shure?");
if (cBox && $('#form1').valid() ) {
    //form is valid 
}
else {
   return false;
}

Upvotes: 0

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