extjs modify css

In modern web application development, styles on the page are colorful and very important. As pages become more complex, it is quite common to use frameworks and libraries to simplify styling operations. Among them, ExtJS is a very popular JavaScript framework that can be used to build large-scale, powerful web applications.

In ExtJS, many controls are rendered based on CSS. Therefore, sometimes it is necessary to modify the style of a certain control or add some custom styles to meet specific needs. This article will introduce how to modify CSS styles in ExtJS.

First of all, you need to understand the style file structure in ExtJS. All style files are located in the /ext/packages directory. The specific path may vary depending on the version. Each component has a dedicated style sheet, for example, the button's style is located in the /ext/packages/core/build/resources/core-all.css file.

To modify the style of a control, you can define a new style or modify the existing style in the .scss file. The .scss file is written in the Sass language, which makes it easier to handle style sheets, such as nested rules, variables, mixins, etc.

In ExtJS, each control has a dedicated CSS class, and the style of the control can be modified by modifying the class. For example, if you want to modify the color of a button, you can use the following code:

.x-btn {
    background-color: #f00;
}

When writing the .scss file, you need to pay attention to the following points:

• ExtJS All .scss files will be processed and a compressed CSS file will be generated, so there is no need to consider performance issues when writing styles.
• Variables can be used to define reused values ​​such as color, size, etc. to avoid code duplication.
• You can use mixins to share styles, such as introducing a style that contains both color and size through @include.

For some controls, you may need to customize some CSS classes to meet more specific needs. In this case, you can use the cls property to set the control's custom CSS class. For example, if you want to add a CSS class with the class name my-panel to a panel, you can use the following code:

Ext.create('Ext.panel.Panel', {
    title: 'My Panel',
    cls: 'my-panel',
    height: 200,
    width: 400,
    renderTo: Ext.getBody()
});

and then define it in the .scss file The style of my-panel class is sufficient.

In addition to modifying the style in the .scss file, you can also use JavaScript code to modify the style at runtime. Each component has an instantiated DOM element, and its style can be modified through the element's style attribute. For example, if you want to use JavaScript code to change the background color of a panel to green, you can use the following code:

var panel = Ext.create('Ext.panel.Panel', {
    title: 'My Panel',
    height: 200,
    width: 400,
    renderTo: Ext.getBody()
});
panel.getEl().setStyle('background-color', 'green');

It should be noted that if the style of a certain control needs to be used in multiple places, it is best to Define it in the .scss file. This makes the style code clearer and more maintainable, and the style can be easily modified.

In short, modifying CSS styles in ExtJS can be achieved using .scss files or JavaScript code. You can choose which method to use based on the specific situation, or use both at the same time to achieve better results.

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