How to implement password display function in javascript

With the popularization of the Internet and the development of technology, our lives are becoming more and more digital and intelligent. In our daily lives, passwords have become a necessary option for most people. However, when entering a password, we often need to ensure the accuracy of the input, which requires us to clearly see the password. So, how to display the password? This article will introduce a method of using JavaScript to display passwords.

JavaScript is a widely used programming language that can be used to add interactivity and dynamics to web pages. In the password input box, we can use JavaScript to display the password in real time. There are many ways to implement password display, and this article will introduce two implementation methods.

Method 1: Use the type attribute of input

There are many types of input tags in HTML, and the type attribute can be set to the password type. This type hides the content of the input box so that we cannot see the actual content of the password even when we enter it. However, when the input box is focused, we can make the content of the input box visible by changing the value of the type attribute.

The following is a sample code that demonstrates how to display passwords by changing the type attribute of input:

<input type="password" id="password">
<button onclick="showPassword()">显示密码</button>

<script>
function showPassword() {
  var password = document.getElementById("password");
  if (password.type === "password") {
    password.type = "text";
  } else {
    password.type = "password";
  }
}
</script>

In this example, we first create a password input box and add Its type is set to password. Next, we create a button and call the showPassword() function when the user clicks the button. This function will get the password input box element and then check the value of its type attribute. If the type attribute is password, set it to text to make the content in the input box visible. If the type attribute is text, set it to password to hide the content of the input box again.

Method 2: Use JavaScript to create DOM elements

In addition to using the type attribute of the input tag to display the password, we can also dynamically generate DOM elements through JavaScript to display the password. Here is a sample code:

<div id="passwordContainer">
  <input type="password" id="password">
  <button onclick="showPassword()">显示密码</button>
</div>

<script>
function showPassword() {
  var passwordInput = document.getElementById("password");
  var passwordContainer = document.getElementById("passwordContainer");
  var passwordText = document.createElement("input");

  passwordText.setAttribute("type", "text");
  passwordText.setAttribute("value", passwordInput.value);
  passwordContainer.replaceChild(passwordText, passwordInput);
}
</script>

In this example, we first create a container that contains a password input box and a "Show Password" button. When the user clicks the button, the showPassword() function is called. This function will get the element of the password input box, then create a new input element and set its type to text. Next, replace the original password input box with the newly generated text box element.

It should be noted that when replacing a DOM element, the value of the newly generated element must be set to the value of the password input box, otherwise the user will not be able to see the input content when entering the password.

Summary:

Both of the above two methods can realize the real-time display of passwords, and each has its own advantages and disadvantages. Using the type attribute of input is very simple, but it may have an impact on the security of the website. Creating DOM elements using JavaScript is relatively more complex, but can effectively avoid security issues. In practical applications, you can choose a method that suits you according to your own needs.

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