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How to modify CSS styles in ExtJS

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Release： 2023-04-26 18:10:09

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ExtJS is a powerful JavaScript library designed to simplify web application development. When developing with ExtJS, we often need to customize CSS styles to meet business needs. This article explains how to modify CSS styles in ExtJS.

1. Understand the CSS used by ExtJS

When developing using ExtJS, we need to introduce the CSS file of ExtJS. When using the command line tool to create an ExtJS project, a global style file app.css will be automatically generated, which contains all ExtJS styles. We can introduce this file in app.js in the following way:

Ext.application({
    name: 'MyApp',
    extend: 'MyApp.Application',
    requires: [
        'Ext.plugin.Viewport',
        'Ext.layout.*',
        'Ext.form.*'
    ],
    // 引入全局样式文件
    css: ['app.css'],
    mainView: 'MyApp.view.main.Main'
});

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In ExtJS components, some CSS styles will be used by default, and these styles are stored in the style sheet file that comes with ExtJS. These styles can be viewed in your browser's developer tools.

2. How to modify the CSS style

Modify the style through the ExtJS component configuration

When using the ExtJS component, we can use the configuration item Modify the style of the component. For example, to modify the font color and background color on a button component:

Ext.create('Ext.button.Button', {
    text: 'My Button',
    ui: 'customButton', // 通过 ui 配置修改样式
    style: {
        color: 'white',  // 通过 style 配置修改样式
        background: 'blue'
    },
    renderTo: 'button-container'
});

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Use custom CSS

In addition to modifying the style through configuration items, we can also Use custom CSS style files. CSS files can be introduced in the index.html file of the ExtJS project:

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>MyApp</title>
    <link rel="stylesheet" type="text/css" href="resources/css/custom.css"> <!-- 引入自定义 CSS -->
</head>

<body>
    <div id="app"></div>
    <script src="ext/build/ext-all.js"></script>
    <script src="app.js"></script>
</body>

</html>

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In the custom CSS style file, we can modify the style of the components in ExtJS. For example, to modify the style of the button component:

.customButton {
    color: white;
    background-color: blue;
}

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Dynamicly modify the CSS style in the code

If you need to dynamically modify the CSS style in the JavaScript code, you can use Ext.dom. The Helper.createDom() method creates a style node and inserts it into the head to dynamically modify the CSS style:

var styleEl = Ext.dom.Helper.createDom({
    tag: 'style', // 标签名称
    html: '.customButton {color: white;background-color: blue;}'  // 自定义的样式
});
Ext.getHead().appendChild(styleEl);   // 将节点插入到 head 中

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Using the above method can flexibly control style changes to meet our needs.

Summary

There are three main ways to modify CSS styles in ExtJS: modifying styles through configuration items, using custom CSS style files, and dynamically modifying CSS styles in code. Depending on your needs, you can choose different methods. At the same time, you need to pay attention to the ExtJS style used by the component by default. You can locate the style class that needs to be modified by viewing the style in the browser developer tools.

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