How to store data into DOM?-JS Tutorial-php.cn

Home

Web Front-end

JS Tutorial

How to store data into DOM?

PHPz

Sep 14, 2023 pm 11:41 PM

如何将数据存储到 DOM 中？

Storing data in the DOM means storing data in plain text format. For example, we store data in state variables while using React or any other reactive framework. When the user updates the data in the input field, it stores the updated data in the state variable.

So we store the data in the state variable before submitting the form. When the form is submitted, we use the value of the state variable.

In plain JavaScript we can do the same thing like store data in plain text format and whenever we need to submit a form we can get the data from the DOM instead of the input field.

Here, we will learn to store data in DOM using JavaScript and Jquery.

Use JavaScript to store data in the DOM

In JavaScript, we can create an object to store data. We can store data in an object in plain text format and get it from the object when needed.

grammar

Users can use JavaScript to store data in the DOM according to the following syntax.

let data_obj = {
   prop1: "",  
}
data_obj.prop1 = value;

In the above syntax, we create the data_obj object to store data, and we can update its value.

Example

In the example below, we create a form with two input fields. Additionally, we gave each input field a name. Whenever the user clicks on the store data function, it calls the storeInDOM() function, which takes the input value and stores it in the object. Whenever the user presses the "Get Stored Data" button, it calls the getFromDOM() function, which accesses the data from the data_obj object.

<html>
<body>
   <h2 id="Using-JavaScript-to-store-data-in-DOM">Using JavaScript to store data in DOM</h2>
   <form>
      <label for = "fname"> First name: </label> <br>
      <input type = "text" id = "fname" name = "fname"> <br>
      <label for = "lname"> Last name: </label> <br>
      <input type = "text" id = "lname" name = "lname">
   </form>
   <button onclick = "storeInDOM()"> Store data </button>
   <button onclick = "getFromDOM()"> get stored data </button>
   <div id = "content"> </div>
   <script>
      let data_obj = {
         fname: "",
         lname: ""
      }
      function storeInDOM() {
         var fname = document.getElementById("fname").value;
         var lname = document.getElementById("lname").value;
         data_obj.fname = fname;
         data_obj.lname = lname;
      }
      function getFromDOM() {
         document.getElementById("content").innerHTML = "The value of first name is - " + data_obj.fname + " <br> The value of the second name is - " + data_obj.lname;
      }
   </script>
</body>
</html>

In the output, the user can see the stored data.

Using jQuery to store data in the DOM

jQuery contains a data API, which we can call using the data() method. We can store data for specific elements. When we pass two parameters to the data API, it stores the data for the specific element; otherwise, it returns the data stored for the specific element.

grammar

Users can use Jquery's data() method to store data in the DOM according to the following syntax.

$("CSS_identifier ").data("key_name", value);

CSS identifiers are used to select elements in the above syntax. The data() method takes the key as the first parameter and the related value as the second parameter.

Example

The form contains the email and password input fields as in the example below. Whenever the user presses the button to store the data, we use Jquery to get the value entered and store it in the DOM of the specific element using the data() method. Here, $("#email").data("email", email) will access the input with id equal to email and store 'email' as the key and the input value as the value of the 'email' key. p>

Therefore, we can use the data() method to store key-value pairs with any element as a reference, and users also need to use the same element as a reference when accessing the data.

<html>
<head>
   <script src = "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.3/jquery.min.js"></script>
</head>
<body>
   <h2 id="Using-jQuery-to-store-data-in-DOM">Using  jQuery to store data in DOM</h2>
   <form>
      <label for = "Email"> Email: </label> <br>
      <input type = "email" id = "email" name = "email"> <br>
      <label for = "password"> Password: </label> <br>
      <input type = "text" id = "password" name = "password">
   </form>
   <button onclick = "storeInDOM()"> Store data </button>
   <button onclick = "getFromDOM()"> Show stored data </button>
   <div id = "content"> </div>
   <script>
      // storing data in DOM using jQuery's data() method
      function storeInDOM() {
         var email = $("#email").val();
         var password = $("#password").val();
         $("#email").data("email", email);
         $("#password").data("password", password);
      }
      // getting data from DOM using jQuery's data() method
      function getFromDOM() {
         var email = $("#email").data("email");
         var password = $("#password").data("password");
         $("#content").html("Email: " + email + " Password: " + password);
      }
   </script>
</body>
</html>

Users learned to store data in the DOM. However, storing data in the DOM is a bad practice because it is temporary. Users can use the browser's local or session storage to store data, and the syntax is simple.

In JQuery, users can use the data API to store data for specific elements. In JavaScript, users need to store all data in single or multiple objects.

The above is the detailed content of How to store data into DOM?. For more information, please follow other related articles on the PHP Chinese website!

Statement

This article is reproduced at:tutorialspoint. If there is any infringement, please contact admin@php.cn delete

Python vs. JavaScript: A Comparative Analysis for DevelopersMay 09, 2025 am 12:22 AM

The main difference between Python and JavaScript is the type system and application scenarios. 1. Python uses dynamic types, suitable for scientific computing and data analysis. 2. JavaScript adopts weak types and is widely used in front-end and full-stack development. The two have their own advantages in asynchronous programming and performance optimization, and should be decided according to project requirements when choosing.

Python vs. JavaScript: Choosing the Right Tool for the JobMay 08, 2025 am 12:10 AM

Whether to choose Python or JavaScript depends on the project type: 1) Choose Python for data science and automation tasks; 2) Choose JavaScript for front-end and full-stack development. Python is favored for its powerful library in data processing and automation, while JavaScript is indispensable for its advantages in web interaction and full-stack development.

Python and JavaScript: Understanding the Strengths of EachMay 06, 2025 am 12:15 AM

Python and JavaScript each have their own advantages, and the choice depends on project needs and personal preferences. 1. Python is easy to learn, with concise syntax, suitable for data science and back-end development, but has a slow execution speed. 2. JavaScript is everywhere in front-end development and has strong asynchronous programming capabilities. Node.js makes it suitable for full-stack development, but the syntax may be complex and error-prone.

JavaScript's Core: Is It Built on C or C ?May 05, 2025 am 12:07 AM

JavaScriptisnotbuiltonCorC ;it'saninterpretedlanguagethatrunsonenginesoftenwritteninC .1)JavaScriptwasdesignedasalightweight,interpretedlanguageforwebbrowsers.2)EnginesevolvedfromsimpleinterpreterstoJITcompilers,typicallyinC ,improvingperformance.

JavaScript Applications: From Front-End to Back-EndMay 04, 2025 am 12:12 AM

JavaScript can be used for front-end and back-end development. The front-end enhances the user experience through DOM operations, and the back-end handles server tasks through Node.js. 1. Front-end example: Change the content of the web page text. 2. Backend example: Create a Node.js server.

Python vs. JavaScript: Which Language Should You Learn?May 03, 2025 am 12:10 AM

Choosing Python or JavaScript should be based on career development, learning curve and ecosystem: 1) Career development: Python is suitable for data science and back-end development, while JavaScript is suitable for front-end and full-stack development. 2) Learning curve: Python syntax is concise and suitable for beginners; JavaScript syntax is flexible. 3) Ecosystem: Python has rich scientific computing libraries, and JavaScript has a powerful front-end framework.

JavaScript Frameworks: Powering Modern Web DevelopmentMay 02, 2025 am 12:04 AM

The power of the JavaScript framework lies in simplifying development, improving user experience and application performance. When choosing a framework, consider: 1. Project size and complexity, 2. Team experience, 3. Ecosystem and community support.

The Relationship Between JavaScript, C , and BrowsersMay 01, 2025 am 12:06 AM

Introduction I know you may find it strange, what exactly does JavaScript, C and browser have to do? They seem to be unrelated, but in fact, they play a very important role in modern web development. Today we will discuss the close connection between these three. Through this article, you will learn how JavaScript runs in the browser, the role of C in the browser engine, and how they work together to drive rendering and interaction of web pages. We all know the relationship between JavaScript and browser. JavaScript is the core language of front-end development. It runs directly in the browser, making web pages vivid and interesting. Have you ever wondered why JavaScr

See all articles