Regular validation express in asp.net

Karthik K

Hi ,

How to not proceed the button click event on the regularvalidationexpression go on Invalid ,Can anyone suggest with example code .the validation working fine but its allow the click event on the codebehind .

source code :


    
    
    
    
        
            Change Password 
            
                
                

                    
                        Old Password 
                        
                    

                    
                        Password
                        
                           
                    
                    
                        Repeat Password
                        
                    
                    
                            
                    
                    
                       

                      
                          
                          ** You should change the Default Password with Strong Password **                                           
                          ** Your Password should contains 1 Uppercase,1 Alphabet 
                           1 Lowercase,1 Number,1 Special Character **

Thanks in advance

Karthik.K

4 Replies

Know the answer? Post it — somebody with the same question will find it here.

Jayraj Chhaya2y ago
Accepted answer
To prevent the button click event from proceeding when the validation fails, you need to set the CausesValidation property of the btnSave button to false. This will bypass the validation controls and prevent the button click event from being triggered when the validation fails.

Here's the updated code:
By setting CausesValidation to false, the button click event will only be triggered if the validation is successful.
+3
Jignesh Kumar2y ago
Hello Karthik,

You mean you want to do validation execution on client side and server side both, to make it work you need to set "EnableClientScript" to true.
```
 

                      
```
+2
Tuhin Paul2y ago
If you want to prevent the button click event from proceeding when the validation fails, you can use the Page_ClientValidate function in JavaScript. This function is automatically generated by ASP.NET when you use validation controls.

onclick="btnSave_Click" CausesValidation="true" />

This JavaScript function (validate()) uses Page_ClientValidate('chkcharacters') to check whether all validation controls in the specified validation group (chkcharacters) have passed. If validation fails, it returns false, preventing the form submission. If validation passes, it returns true, allowing the form submission to proceed.

Note: The Page_ClientValidate function is automatically generated by ASP.NET when you use validation controls with ValidationGroup. Ensure that you have ClientIDMode set to AutoID or similar for your controls if you are using Master Pages or have other considerations for the client-side IDs.
+2
Jithu Thomas2y ago
To prevent the button click event from proceeding when the regular expression validation fails, you can use the Page_ClientValidate function in JavaScript to manually trigger client-side validation before allowing the form submission. Additionally, you can check the Page_IsValid property in your code-behind to ensure that server-side validation is also successful.

Here's an example of how you can modify your code:
1. Add an OnClientClick attribute to your button and call the validateForm JavaScript function:
2. Add the validateForm JavaScript function to your page:
  
  This JavaScript function performs the following:
3. Triggers client-side validation for the specified validation group ('chkcharacters').
4. Checks the Page.IsValid property to ensure server-side validation is successful.
5. Returns true if both client-side and server-side validations pass, allowing the form submission.
6. Returns false if either client-side or server-side validation fails, preventing the form submission.
+2