Requirements
What do current frameworks emphasize on one-way binding and what are two-way binding?
- One-way data binding: It means that we write the template first, then integrate the template and data (the data may come from the background) to form HTML code, and then insert this HTML code into the document flow.
- Two-way data binding: Two-way binding between data model (Module) and view (View). That is, no matter whether I modify the relevant data of the data model or the data on the view, the corresponding data will be updated accordingly.
Implementation principle
The main thing is the binding of events.
- On the view layer (View), you can bind the keyup event to update the data model
- Use the Object.defineProperty() method on the data model to define the set method of the object. When the object property setting is triggered, Also modify the data in the view layer.
Case Code
<!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8">
<title>Title</title></head><body><input type="text" id="myinput" ><script>
var input = document.getElementById("myinput");
var obj = {};
Object.defineProperty(obj, "input", {
get: function () {
return input.value;
},
set: function (val) {
input.value = val;
changeCallback(input.value);
}
});
input.onkeyup = function () {
obj.input = input.value;
}; function changeCallback(val) {
console.log("这里是不管view层，还是module层修改后的回调，最后设置的值是"+val);
}</script></body></html>Ideas
First, we first use the Object.defineProperty() method to set the set method of obj, as long as we modify the input of obj Attribute, this set method will be triggered, and then the callback will be triggered, which realizes the data binding of the module layer.
Then, bind the keyup event on the input to realize the binding of the view layer.
As long as there is a modification between the two, regardless of the value of input or the input attribute of obj, the latest modified value will be obtained.
This should be the simplest idea.
The above is the detailed content of How to implement two-way data binding in js. For more information, please follow other related articles on the PHP Chinese website!
es6数组怎么去掉重复并且重新排序May 05, 2022 pm 07:08 PM去掉重复并排序的方法：1、使用“Array.from(new Set(arr))”或者“[…new Set(arr)]”语句，去掉数组中的重复元素，返回去重后的新数组；2、利用sort()对去重数组进行排序，语法“去重数组.sort()”。
JavaScript的Symbol类型、隐藏属性及全局注册表详解Jun 02, 2022 am 11:50 AM本篇文章给大家带来了关于JavaScript的相关知识，其中主要介绍了关于Symbol类型、隐藏属性及全局注册表的相关问题，包括了Symbol类型的描述、Symbol不会隐式转字符串等问题，下面一起来看一下，希望对大家有帮助。
原来利用纯CSS也能实现文字轮播与图片轮播！Jun 10, 2022 pm 01:00 PM怎么制作文字轮播与图片轮播？大家第一想到的是不是利用js，其实利用纯CSS也能实现文字轮播与图片轮播，下面来看看实现方法，希望对大家有所帮助！
JavaScript对象的构造函数和new操作符（实例详解）May 10, 2022 pm 06:16 PM本篇文章给大家带来了关于JavaScript的相关知识，其中主要介绍了关于对象的构造函数和new操作符，构造函数是所有对象的成员方法中，最早被调用的那个，下面一起来看一下吧，希望对大家有帮助。
JavaScript面向对象详细解析之属性描述符May 27, 2022 pm 05:29 PM本篇文章给大家带来了关于JavaScript的相关知识，其中主要介绍了关于面向对象的相关问题，包括了属性描述符、数据描述符、存取描述符等等内容，下面一起来看一下，希望对大家有帮助。
javascript怎么移除元素点击事件Apr 11, 2022 pm 04:51 PM方法：1、利用“点击元素对象.unbind("click");”方法，该方法可以移除被选元素的事件处理程序；2、利用“点击元素对象.off("click");”方法，该方法可以移除通过on()方法添加的事件处理程序。
整理总结JavaScript常见的BOM操作Jun 01, 2022 am 11:43 AM本篇文章给大家带来了关于JavaScript的相关知识，其中主要介绍了关于BOM操作的相关问题，包括了window对象的常见事件、JavaScript执行机制等等相关内容，下面一起来看一下，希望对大家有帮助。
foreach是es6里的吗May 05, 2022 pm 05:59 PMforeach不是es6的方法。foreach是es3中一个遍历数组的方法，可以调用数组的每个元素，并将元素传给回调函数进行处理，语法“array.forEach(function(当前元素,索引,数组){...})”；该方法不处理空数组。
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
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),
Notepad++7.3.1
Easy-to-use and free code editor
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.
Atom editor mac version download
The most popular open source editor
SublimeText3 Linux new version
SublimeText3 Linux latest version
