What is the difference between text(), val() and html() in jquery
The difference between text(), val() and html() in jquery: text() is used to access the text content of html elements; html() can not only be used to access the text content of html elements, It can also be used to access html content; val() is only used to access the content of input elements.
The operating environment of this tutorial: windows7 system, jquery1.12.4 version, Dell G3 computer.
Common points: text(), html(), and val() are used to store and retrieve values of html elements.
Difference:
- text() is used to access the text content of html elements
- html() can not only be used to access the text content of html elements, It can also be used to access html content
- val() is used to access input element content
text() definition and usage
text() Method method sets or returns the text content of the selected element. If there are sub-tags, the text in the sub-tags is returned together, which is equivalent to the innerText of js.
The code is as follows
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<script src="./js/jquery-1.12.4.js"></script>
<title>Document</title>
</head>
<body>
<p id="p1">p有文本内容</p>
<p id="p2">
p2内的文本
<span>span内有文本内容</span>
</p>
<input type="text" id="input1" value="这是一个input标签">
<input type="text" name="" id="input2" placeholder="能成功获取">
<button id="button1" value="这是一个button标签"></button>
<script>
console.log($("#p1").text());
console.log($("#p2").text());
console.log($("#p2 span").text()) ;
console.log($("#input1").text());
console.log($("#input2").text());
console.log($("#button1").text());
</script>
</body>
</html>Console printed results
It can be seen that text() only outputs the text content within the label, and js The innerText method is the same as
html() definition and usage
html() method returns or sets the content of the selected element (inner HTML) , including tags. If there are sub-tags, return the sub-tag itself and the text within the sub-tag
Equivalent to innerHTML of js
If the method does not set parameters, it will return The current content of the selected element.
<body>
<p id="p1">p有文本内容</p>
<p id="p2">
p2内的文本
<span>span内有文本内容</span>
</p>
<input type="text" id="input1" value="这是一个input标签">
<input type="text" name="" id="input2" placeholder="能成功获取">
<button id="button1" value="这是一个button标签"></button>
<script>
console.log($("#p1").html());
console.log($("#p2").html());
console.log($("#p2 span").html());
console.log($("#input1").html());
console.log($("#input2").html());
console.log($("#button1").html());
</script>
</body>The result of printing through the console
Print the text content in the current tag. If there is a sub-tag, combine the sub-tag itself and the Print the text together
This is similar to innerHTML of js
Notes on using text() and html():
Through the above two examples, We know that the element that exists in the document object (dom), such as p, can obtain its text value through text() and html(). Then if this element does not exist in the document object (dom), but we pass text( ) and html() to get its text value, what will happen?
The h1 element does not exist in dom, we add the following code:
console.log($('h1')) console.log($('h1').text()) //空字符串 console.log($('h1').html()) //undefined
The following is the printing result: $('h1').text() prints an empty string, $('h1' ),html() print undefined
val() definition and usage
val() method Returns or sets the value of the selected element.
The value of the element is set through the value attribute. This method is mostly used for input elements.
The method is mainly used to obtain the value of the form element
If this method does not set parameters, it returns the current value of the selected element.
<body>
<p id="p1">p有文本内容</p>
<p id="p2">
p2内的文本
<span>span内有文本内容</span>
</p>
<input type="text" id="input1" value="这是一个input标签1">
<input type="text" name="" id="input2" value="这是一个input标签2" placeholder="能成功获取">
<button id="button1" value="这是一个button标签"></button>
<script>
console.log($("#p1").val());
console.log($("#p2").val());
console.log($("#p2 span").val());
console.log($("#input1").val());
console.log($("#input2").val());
console.log($("#button1").val());
</script>
</body>Printing the results through the console
val() is used to output the data in the form. It can be seen that the text in the p and span tags are not the same. It was not output. I also tested the H5 new tag placeholder
which was also not output, so this val should only be for the value attribute of the tag
So what about setting the value of val()
We add three lines of code to the script tag and set the values of two input boxes and a botton
$('#input1').val('123'); $('#input2').val('123'); $('#button1').val('123');
Let’s take a look at the effect and HTML structure presented by the browser:
For the input box, the value set through val() is displayed in the text box, and its own value has not been changed; for the button, the value set through val() is actually in the text box. Assigning a value to the value attribute
For more programming-related knowledge, please visit:Introduction to Programming! !
The above is the detailed content of What is the difference between text(), val() and html() in jquery. For more information, please follow other related articles on the PHP Chinese website!
JavaScript in Action: Real-World Examples and ProjectsApr 19, 2025 am 12:13 AMJavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.
JavaScript and the Web: Core Functionality and Use CasesApr 18, 2025 am 12:19 AMThe main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.
Understanding the JavaScript Engine: Implementation DetailsApr 17, 2025 am 12:05 AMUnderstanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.
Python vs. JavaScript: The Learning Curve and Ease of UseApr 16, 2025 am 12:12 AMPython is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.
Python vs. JavaScript: Community, Libraries, and ResourcesApr 15, 2025 am 12:16 AMPython and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.
From C/C to JavaScript: How It All WorksApr 14, 2025 am 12:05 AMThe shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.
JavaScript Engines: Comparing ImplementationsApr 13, 2025 am 12:05 AMDifferent JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.
Beyond the Browser: JavaScript in the Real WorldApr 12, 2025 am 12:06 AMJavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
SublimeText3 Chinese version
Chinese version, very easy to use
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
Dreamweaver CS6
Visual web development tools
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
Zend Studio 13.0.1
Powerful PHP integrated development environment
