How to set width dynamically using uniapp

With the development of the mobile Internet, more and more developers have begun to learn and use uniapp to quickly develop practical mobile apps. During development, dynamically setting the width of a component is a very common requirement. This article will introduce how to use uniapp to dynamically set the width so that your application can have good visual effects on different devices.

1. Why we need to dynamically set the width

When developing mobile applications, we need to consider the size and screen resolution of different devices, especially for devices with different screen densities, we need to flexibly set components width to adapt to screen changes. For example, we may need to place multiple components on a page, and the width of these components needs to adapt according to the size and density of the screen. Failure to dynamically set the width may result in poor display on some devices.

2. The idea and principle of dynamically setting the width of uniapp

There are generally two methods to dynamically set the width in uniapp:

1. Use percentage (%) to set the width

Using percentage (%) to set the width can make the width of the component adaptive according to the screen size, achieving the effect of dynamically setting the width. For example, if you need to set the width of a component to 50% of the screen width, you can write like this:

<view style="width: 50%;">这个组件的宽度为屏幕宽度的50%</view>

2. Use JS to calculate the width and set the style

It is also the same to use JS to calculate the width and set the style. a common way. Depending on the device width and resolution, we can use JS to calculate the width of the component and set the style to achieve the effect of dynamically setting the width.

For example, if you need to set the width of a component to 50% of the screen width, you can write like this:

<view :style="{width: screenWidth / 2 + &#39;px&#39;}">这个组件的宽度为屏幕宽度的50%</view>

Among them, screenWidth is the screen width of the current device obtained through the API provided by uniapp. The specific code is as follows:

<script>
    export default {
        data() {
            return {
                screenWidth: uni.getSystemInfoSync().screenWidth // 获取当前设备的屏幕宽度
            }
        }
    }
</script>

3. Implementation method of dynamically setting the width of uniapp

Based on the above principles and ideas, we can use the following code to dynamically set the width of the component of uniapp:

<template>
  <view class="container">
    <view :style="{width: screenWidth / 2 + &#39;px&#39;}" class="box">这个组件的宽度为屏幕宽度的50%</view>
    <view :style="{width: screenWidth / 3 + &#39;px&#39;}" class="box">这个组件的宽度为屏幕宽度的33.33%</view>
    <view :style="{width: screenWidth / 4 + &#39;px&#39;}" class="box">这个组件的宽度为屏幕宽度的25%</view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        screenWidth: uni.getSystemInfoSync().screenWidth // 获取当前设备的屏幕宽度
      }
    }
  }
</script>

<style>
  .container {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .box {
    margin: 20px;
    padding: 20px;
    border: 1px solid #ccc;
  }
</style>

In the code, we use the API uni.getSystemInfoSync() provided by uniapp to get the screen width of the current device, then divide the width value by the corresponding ratio to get the width value of the component, and use the :style attribute to bind the style to calculate it. The width value is set to the component. In this way, we can achieve the effect of adaptively setting the width of the component under different screen sizes and resolutions.

Summary:

This article introduces the principle and implementation method of dynamically setting the width of uniapp, hoping to help readers better develop mobile applications. In the actual development process, you can choose to use percentages to set the width or use JS to calculate the width and set the style according to your needs to achieve the effect of dynamically setting the component width.

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