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Password Validation with Javascript Example and Code
Checkbox Validation with javascript

Here is the code:

  <html>
  <head>
  
  <script> 
    function validForm(passForm) { 
    if (passForm.passwd1.value == "") { 
    alert("you must enter a password");
    passForm.passwd1.focus();
    return false;
    } 
    if (passForm.passwd1.value != passForm.passwd2.value) { 
    alert("Entered passwords did not match");
    passForm.passwd1.focus();
    passForm.passwd1.select();
    return false;
    } 
    return true;
    } 
    </script> 
  
    <title>Password Validation</title>
	
    </head>
	
    <body bgcolor="#FFFFFF">
    <form name="form" action="validation.asp" onsubmit="return 
    validForm(this)">
   
    Your name: 
    <input type="text" name="textfield">
    <BR>
    Choose a password: 
    <input type="password" name="passwd1">
    <BR>
    Verify password: 
    <input type="password" name="passwd2">
    <BR>
    <input type="submit" value="Submit" name="submit">
    <input type="reset">
    
    </body>
    </html>