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Password Match Validation in JavaScript

Password match validation in javascript
 
Html Code For Two Password textbox
  1. <div class="form-group">  
  2.     <label class="col-sm-2 control-label">  
  3.         Password:</label>  
  4.     <div class="col-sm-10">  
  5.         <input type="password" id="pass1" class="tex" name="pw1" ng-model="passw1" placeholder="Password" />  
  6.     </div>  
  7. </div>  
  8. <div class="form-group">  
  9.     <label class="col-sm-2 control-label">  
  10.         Repeat:</label>  
  11.     <div class="col-sm-10">  
  12.         <input type="password" id="pass2" class="tex" name="pw2" ng-model="passw2" placeholder="Repeat Password" />  
  13.     </div>  
  14. </div>  
JavaScript Code 
  1. strErrorMsg = "";  
  2. checkPass(document.getElementById('pass2'), '-Password Not Match');  
  3.   
  4. if (strErrorMsg == '')    
  5. {....  
  6.   
  7. }  
  8. $window.alert(' Errors \n' + strErrorMsg);  
Validation Code
  1. function checkPass(elem, helperMsg)   
  2. {  
  3.     if (pass1.value !== "" && pass2.value !== "")   
  4.     {  
  5.         if (pass1.value !== pass2.value)   
  6.         {  
  7.             strErrorMsg = strErrorMsg + helperMsg + "\n";  
  8.         }   
  9.         else   
  10.         {  
  11.         }  
  12.     }  
  13. }