javascript - What changes to DOM are made when MVC Validation triggers? -

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I have a form in a modal window which is currently showing some validity (I am using ASP.NET MVC, I am using JQI UI, AJAX form, data annotations and humorous)

When this validation triggers, I have seen it so far that it does some things:

1: My Validation Summary from .validation-summary-valid to .validation-summary-errors

2: My friend A class has been added to the valid input, which is called .input-validation-error

3: My verification messages to their class .field -validation-valid .field-validation-error

But there is something else that is doing it and I'm not doing this to work Used to be.

I is a text box which requires I can select inside this box before triggering verification, then select the second box and the verification will be silent.

But as soon as I have an empty text box, I can select the text box and write something to remove the verification immediately, but if it is clear the hen and select a different box. The error has been re-applied without resubmitting.

So my question is: what has changed, how does it know that I have already tried to submit?

When confirmed, it adds a class for each input / class that must be valid . When the input / selection is not valid, then it adds a class for input / selection: 

  class = "input-validation-error"   
 when It is valid, it adds:    class = "valid"   
  Validation only sets fire on control when you change the value, Not when the focus loses.   
 Verification fire on change, even before you submit the form. Take a required textbox, add a value for it, and close the tab ... then go back and delete that value, and you should see the text box in red.

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