How to change the properties of controls in Uniapp

Uniapp changes control properties

Uniapp is a cross-platform front-end framework. Its power is that after writing once, the code can be run on different platforms, such as Android and iOS. During the development process, we often need to change the properties of the control, including style and text content. So how to change the properties of the control in Uniapp?

1. Change the text content

Changing the text content is one of the most commonly used operations in our development. Controls in Uniapp are wrapped with {{}}. We can use {{}} to bind data to dynamically change text content.

For example, if we want to display the current time in a text box, we can bind the content of the text box to a timestamp variable:

<template>
  <view>
    <text>{{current_time}}</text>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        current_time: ''
      }
    },
    mounted() {
      setInterval(() => {
        this.current_time = new Date().toLocaleTimeString()
      }, 1000)
    }
  }
</script>

Continuously update the value of the current_time variable through a timer, You can achieve dynamic modification of text content. This method is suitable for various controls, such as text boxes, buttons, etc.

2. Change the style

Changing the style of a control is also one of the commonly used operations in development. In Uniapp, you can use style sheets to modify the style of controls. The most commonly used properties include color, background-color, font-size, etc.

<template>
  <view class="container">
    <text class="title">Hello World</text>
  </view>
</template>

<style>
  .container {
    background-color: #f5f5f5;
    padding: 20rpx;
  }
  .title {
    color: red;
    font-size: 28rpx;
  }
</style>

Here we set the background color to #f5f5f5, the font color to red, and the font size to 28rpx. Through style sheets, we can easily modify the style of controls to make the page look more beautiful.

3. Change visibility

In some cases, we need to hide or show controls in the program based on certain conditions. In Uniapp, you can use the v-show and v-if instructions to achieve this function. The v-show directive determines whether an element is displayed based on the value of the expression, and the v-if directive determines whether the element exists based on the value of the expression.

<template>
  <view>
    <text v-show="show_text">Hello World</text>
    <button v-if="show_button" @click="hide_text()">Hide</button>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        show_text: true,
        show_button: true
      }
    },
    methods: {
      hide_text() {
        this.show_text = false
        this.show_button = false
      }
    }
  }
</script>

Here we define a show_text variable and a show_button variable, which represent the visibility of the text box and button respectively. By default, both controls are visible. When we click the button, the hide_text method will set the values ​​of the show_text and show_button variables to false to achieve the purpose of hiding the control.

Summary

Through the above three aspects of demonstration, we can see that Uniapp is a very powerful front-end framework that can help us easily change the properties of controls to achieve various complex Effect. If you are a front-end developer, I believe Uniapp will make your work more convenient.

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