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c# - Ajax.BeginForm beforeSubmit event

In MVC, is there a way to fire an onBeforeSubmit event when using Ajax.BeginForm? I'd like to validate some data on the client side and give proper feedback to the user.

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by (71.8m points)

OnBegin is what you're looking for:

using (Ajax.BeginForm("Action", "Controller", 
new AjaxOptions() {
OnBegin = "alert('Replace with validation logic.')"
}))

UPDATE

Something like this:

   function onSubmitFeedbackBegin(context) {
        if (uploading > 0) {
            return false;
        }
    }

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