How to get the page width in vue

Vue.js is a popular JavaScript framework that can be used to build high-performance single-page applications (SPA). When developing applications using Vue.js, sometimes it is necessary to obtain the page width in order to make corresponding adaptation operations. This article explains how to get the page width and how to apply it in a Vue.js application.

Method 1: Use the innerWidth property of the window object

In JavaScript, you can get the width of the browser window through the innerWidth property of the window object. Since Vue.js is built on JavaScript, you can easily get the page width using the following code snippet:

let width = window.innerWidth;

This code snippet will assign the width of the current window to the width variable. However, the value of this variable is not automatically updated when the window size changes. Therefore, if you need to update the width value when the window size changes, you can use the following code:

window.addEventListener('resize', () => {
  let width = window.innerWidth;
  // 在此处操作 pageWidth 变量
});

The above code uses the resize event listener to automatically update the width value when the window size changes. However, if this method is used in a Vue.js application, each update requires the use of an event listener to obtain the width value, which results in increased code complexity and reduced efficiency.

Method 2: Use the calculated property of Vue.js

The calculated property in Vue.js is a special property that can automatically calculate new values ​​based on changes in other data. Therefore, you can use the page width as a calculated property to automatically update related components when the page width changes. For example:

<template>
  <div class="wrapper">
    <div class="content" :style="{ width: pageWidth + 'px' }">
      <!-- 在此处插入内容 -->
    </div>
  </div>
</template>

<script>
export default {
  name: 'MyComponent',
  data() {
    return {
      // 在此处声明公用数据
    };
  },
  computed: {
    pageWidth() {
      return window.innerWidth;
    }
  }
};
</script>

In the above code, the pageWidth calculated property is used to obtain the page width, and then applied to the component's style property. Due to the nature of computed properties, the pageWidth property is automatically updated whenever the window size changes, ensuring that the component's style is always consistent with the window width.

Method 3: Use Vue.js plug-in

If multiple components in the application need to obtain the page width, writing calculated properties in each component may become complicated and cumbersome. . To avoid this, you can write a Vue.js plugin to manage page width. The following is a simple plug-in example:

const WidthPlugin = {
  install(Vue) {
    const getScreenWidth = function() {
      return window.innerWidth;
    };
    Vue.prototype.$pageWidth = getScreenWidth;
  }
};

export default WidthPlugin;

The plug-in registers a prototype method named $pageWidth in Vue.js, which returns the width of the current page. To use the plugin in your application, just introduce and register it in main.js:

import Vue from 'vue';
import WidthPlugin from './plugins/WidthPlugin';

Vue.use(WidthPlugin);

In the component, use the $pageWidth method to get the page width and change it when the window size changes Automatically updated at any time. For example:

<template>
  <div class="wrapper">
    <div class="content" :style="{ width: $pageWidth() + 'px' }">
      <!-- 在此处插入内容 -->
    </div>
  </div>
</template>

<script>
export default {
  name: 'MyComponent',
  data() {
    return {
      // 在此处声明公用数据
    };
  }
};
</script>

In the above code, use the $pageWidth method to get the page width and apply it to the component's style.

Summary

This operation can be easily achieved whether using the innerWidth property of the window object, a calculated property of Vue.js, or writing a Vue.js plugin to get the page width. In actual applications, the appropriate method should be selected according to the specific situation to improve code readability and performance. If more components need to use this property, it is recommended to use a plug-in. If you only use the calculated property directly in one component, you can.

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