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PHP JavaScript form diseases not passed and form still submitted

Source: Internet
Author: User
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PHP JavaScript form validation failed and form still submitted
Title, my case is not to enter any data, click Submit Registration, will pop up "Please enter user name" such as the prompt, click OK to go to another page, and only a sentence: Column ' UserName ' cannot be null.
Here's the code:
HTML Code 
  
  
  
  
   
  <title>Untitled Document</title>
  
   
  
  
  Forum
Registered

                  
Please fill in the following required information to complete the registration
With * are required fields, if not complete will not be registeredClear cookies Contact us no plates mobile browse back to top
Time now is:06-21 21:28, Gzip enabled Zhejiang b2-20070029
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