What is the process for logging in using a Bootstrap modal?

Question

What is the process for logging in using a Bootstrap modal?

I am currently working on creating a login feature using a bootstrap modal, but unfortunately, I am facing some issues with it. If anyone is willing to offer their assistance, I would greatly appreciate it.

My knowledge of JavaScript and Bootstrap is limited.

function login(){
        
        var username=document.getElementsByName("username").value;
        var password=document.getElementsByName("password").value;
        if(username.value == null && password.value == null){
             $('.alert').show();
            
        }
         else{
       document.getElementById("wrongpassword").innerHTML="Thank u very much"; 
         }
    }

.alert{
  display:none;
}

<div class="modal fade" id="modal1"  role="dialog">
    <div class="modal-dialog">
    <!-- Modal content-->
      <div class="modal-content">
        <div class="modal-header">
          <button type="button" class="close" data-dismiss="modal">&times;</button>
          <h3 class="modal-title text-center" style="color:#333366;"><strong>LOGIN TO FOOD SAVIOR</strong></h3>
        </div>
        <div class="modal-body">
<div class="form-group">
<input type="text" placeholder="Username" name="username" class="form-control" style="height:40px;" required>
</div>
<div class="form-group">
<input type="password" placeholder="Password" name="password" class="form-control" style="height:40px;" required>
</div>
<div class="text-center">
<input type="submit" value="LOGIN" name="login_btn" id="login_btn" onclick="login()" class="btn btn-primary" style="background-color:#333366;height:40px;color:#ffffff">
</div>
            
            <div class="alert alert-danger alert-dismissable fade in">
                <button type="button" class="close" data-hide="alert">&times;</button>
                    <p> You Entered Wrong Detail. Enter Again
                    </p>
            </div>
            
            <p id="wrongpassword"></p>
<h4 class="text-center"><a href="#">Forget Password</a></h4>
</div>
        <div class="modal-footer">
<h4 class="text-center">Don't have Account yet? Let's <a href="#modal2" data-toggle="modal">Sign up</a> its fun and easy!</h4>
            <div class="text-center"><button type="button" class="btn btn-success" data-dismiss="modal"><p>Close</p></button>
        </div>
        </div>
      </div>
      
    </div>
  </div>
  
  <a href="#modal1" data-toggle="modal">
            <h5>Login</h5></a>

strong text

javascript css bootstrap-modal

Answer 1

Answer №1

When your code doesn't run as expected, there are three main reasons to consider:

If you are using `getElementsByName` and treating it as a single DOM element instead of a collection, make sure to add `[0]` after the function call to access the first element in the collection.
Be cautious of accessing the `value` property multiple times for your `username` and `password` elements. Once you've assigned the values to variables, there's no need to extract them again in your `if` statement.
Ensure you are checking for the right conditions when displaying an alert. Instead of comparing `username == null && password == null`, focus on `!username || !password`, as `username` and `password` are always strings and never `null`. Another approach is to check if they are empty strings with `username === '' || password === ''` or converting them to booleans for a more concise comparison.

Demo Snippet:

function login() {
  var username = document.getElementsByName("username")[0].value;
  var password = document.getElementsByName("password")[0].value;
  
  if (!username || !password) {
    $('.alert').show();
  } else {
    document.getElementById("wrongpassword").innerHTML = "Thank u very much";
  }
}

.alert { display: none; }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<div class="modal fade" id="modal1" role="dialog">
  <div class="modal-dialog">
  
    <!-- Modal content-->
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal">&times;</button>
        <h3 class="modal-title text-center" style="color:#333366;"><strong>LOGIN TO FOOD SAVIOR</strong></h3>
      </div>
      <div class="modal-body">
        <div class="form-group">
          <input type="text" placeholder="Username" name="username" class="form-control" style="height:40px;" required>
        </div>
        <div class="form-group">
          <input type="password" placeholder="Password" name="password" class="form-control" style="height:40px;" required>
        </div>
        <div class="text-center">
          <input type="submit" value="LOGIN" name="login_btn" id="login_btn" onclick="login()" class="btn btn-primary" style="background-color:#333366;height:40px;color:#ffffff">
        </div>

        <div class="alert alert-danger alert-dismissable fade in">
          <button type="button" class="close" data-hide="alert">&times;</button>
          <p> You Entered Wrong Detail. Enter Again
          </p>
        </div>

        <p id="wrongpassword"></p>
        <h4 class="text-center"><a href="#">Forget Password</a></h4>
      </div>
      <div class="modal-footer">
        <h4 class="text-center">Don't have Account yet? Let's <a href="#modal2" data-toggle="modal">Sign up</a> its fun and easy!</h4>
        <div class="text-center"><button type="button" class="btn btn-success" data-dismiss="modal"><p>Close</p></button>
        </div>
      </div>
    </div>

  </div>
</div>

<a href="#modal1" data-toggle="modal">
  <h5>Login</h5>
</a>

Answer 2

When your code doesn't run as expected, there are three main reasons to consider:

If you are using `getElementsByName` and treating it as a single DOM element instead of a collection, make sure to add `[0]` after the function call to access the first element in the collection.
Be cautious of accessing the `value` property multiple times for your `username` and `password` elements. Once you've assigned the values to variables, there's no need to extract them again in your `if` statement.
Ensure you are checking for the right conditions when displaying an alert. Instead of comparing `username == null && password == null`, focus on `!username || !password`, as `username` and `password` are always strings and never `null`. Another approach is to check if they are empty strings with `username === '' || password === ''` or converting them to booleans for a more concise comparison.

Demo Snippet:

function login() {
  var username = document.getElementsByName("username")[0].value;
  var password = document.getElementsByName("password")[0].value;
  
  if (!username || !password) {
    $('.alert').show();
  } else {
    document.getElementById("wrongpassword").innerHTML = "Thank u very much";
  }
}

.alert { display: none; }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<div class="modal fade" id="modal1" role="dialog">
  <div class="modal-dialog">
  
    <!-- Modal content-->
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal">&times;</button>
        <h3 class="modal-title text-center" style="color:#333366;"><strong>LOGIN TO FOOD SAVIOR</strong></h3>
      </div>
      <div class="modal-body">
        <div class="form-group">
          <input type="text" placeholder="Username" name="username" class="form-control" style="height:40px;" required>
        </div>
        <div class="form-group">
          <input type="password" placeholder="Password" name="password" class="form-control" style="height:40px;" required>
        </div>
        <div class="text-center">
          <input type="submit" value="LOGIN" name="login_btn" id="login_btn" onclick="login()" class="btn btn-primary" style="background-color:#333366;height:40px;color:#ffffff">
        </div>

        <div class="alert alert-danger alert-dismissable fade in">
          <button type="button" class="close" data-hide="alert">&times;</button>
          <p> You Entered Wrong Detail. Enter Again
          </p>
        </div>

        <p id="wrongpassword"></p>
        <h4 class="text-center"><a href="#">Forget Password</a></h4>
      </div>
      <div class="modal-footer">
        <h4 class="text-center">Don't have Account yet? Let's <a href="#modal2" data-toggle="modal">Sign up</a> its fun and easy!</h4>
        <div class="text-center"><button type="button" class="btn btn-success" data-dismiss="modal"><p>Close</p></button>
        </div>
      </div>
    </div>

  </div>
</div>

<a href="#modal1" data-toggle="modal">
  <h5>Login</h5>
</a>

Answer 3

Answer №2

One potential issue is that you are trying to access the .value Property twice:

    function login(){

         var username=document.getElementsByName("username");
         var password=document.getElementsByName("password");
         if(username.value == null && password.value == null){
              $('.alert').show();

         }
         else{
       document.getElementById("wrongpassword").innerHTML="Thank u very much"; 
          }
     }

Make sure you are properly targeting the elements you want to retrieve the values from.

Answer 4

One potential issue is that you are trying to access the .value Property twice:

    function login(){

         var username=document.getElementsByName("username");
         var password=document.getElementsByName("password");
         if(username.value == null && password.value == null){
              $('.alert').show();

         }
         else{
       document.getElementById("wrongpassword").innerHTML="Thank u very much"; 
          }
     }

Make sure you are properly targeting the elements you want to retrieve the values from.

Answer 5

Answer №3

Values for username and password are already assigned as follows:

    var username=document.getElementsByName("username").value;
    var password=document.getElementsByName("password").value;

This simplifies the code to:

    if(username == "" || password == ""){

Avoid using null and compare with empty strings instead. It appears you intended to use || and not &&.

Answer 6

Values for username and password are already assigned as follows:

    var username=document.getElementsByName("username").value;
    var password=document.getElementsByName("password").value;

This simplifies the code to:

    if(username == "" || password == ""){

Avoid using null and compare with empty strings instead. It appears you intended to use || and not &&.

Answer 7

Answer №4

Using .value twice in your function is causing it to not work correctly. Please make the following changes:

function login(){

    var username=document.getElementsByName("username");
    var password=document.getElementsByName("password");
    if(username.value == null && password.value == null){
         $('.alert').css("display","block");

    }
     else{
   document.getElementById("wrongpassword").innerHTML="Thank u very much"; 
     }
}

Answer 8

Using .value twice in your function is causing it to not work correctly. Please make the following changes:

function login(){

    var username=document.getElementsByName("username");
    var password=document.getElementsByName("password");
    if(username.value == null && password.value == null){
         $('.alert').css("display","block");

    }
     else{
   document.getElementById("wrongpassword").innerHTML="Thank u very much"; 
     }
}

What is the process for logging in using a Bootstrap modal?

Answer №1

Demo Snippet:

Answer №2

Answer №3

Answer №4

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