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I want to check page validation on client side, like Page.Validate() but it's a server side method. Is there any client side function which can work like Page.Validate() with JavaScript?

shA.t
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Azhar
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2 Answers2

76

Page_ClientValidate() will work. It returns true if the page was valid and it works fine.

If you are using ASP.NET 2.0, pass the validation group name as a parameter.
E.g.

if(Page_ClientValidate("SomeValidationGroup"))
     alert('its valid');

Otherwise if there is no validation group Page_ClientValidate("") will handle it.
E.g.

if(Page_ClientValidate(""))
     alert('its valid');
shA.t
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Azhar
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  • This is the quick answer. Tim's answer gives more detail if needed, just no examples. – Austin Rhymer Mar 02 '15 at 21:44
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    Note though that the Page_ClientValidate() does not exist if there are no validators on the page. So make sure to always check if it's there. – Robba Apr 14 '15 at 09:47
  • In my case, using Page_ClientValidate() derailed the functionality set up by the back end. Instead of performing the validation it just always returned true and no other validation actions or submission steps occurred. To the user the form didn't change. – JustinJason Oct 02 '15 at 20:08
25

There is a mini-clientside-validation API:

http://msdn.microsoft.com/en-us/library/aa479045.aspx#aspplusvalid_clientside

alt text

and here are some functions to trigger validation on validators:

alt text

Tim Schmelter
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