How uniapp implements conditional rendering to control page display

uniapp implements how to use conditional rendering to control page display, requiring specific code examples

In uniapp development, we often need to decide a certain part of the page based on different conditions The display and hiding of these elements requires the use of conditional rendering. Conditional rendering can make judgments based on given conditions and selectively render certain content on the page based on the judgment results.

In uniapp, there are two ways to use conditional rendering: using the v-if instruction and using the v-show instruction. The two methods will be described below, with specific code examples.

Use the v-if instruction to implement conditional rendering:

The v-if instruction is one of the common instructions provided by the vue framework. It can determine whether to render a certain object based on the true or false of a given expression. elements.

First, define the elements that need to be conditionally rendered in the template tag, and then use the v-if directive to specify the judgment conditions. If the condition is true, the element will be rendered; if false, the element will be removed.

The specific code is as follows:

<template>
  <view>
    <text v-if="showElement">我是需要渲染的元素</text>
    <text v-else>我是需要隐藏的元素</text>
  </view>
</template>

<script>
export default {
  data() {
    return {
      showElement: true // 根据该值来决定元素的显示与隐藏
    }
  }
}
</script>

In the above code, we define a showElement attribute. The value of this attribute determines the display and hiding of elements that require conditional rendering. If showElement is true, "I am the element that needs to be rendered" will be displayed; if showElement is false, "I am the element that needs to be hidden" will be displayed.

Use the v-show instruction to implement conditional rendering:

The v-show instruction is also one of the common instructions provided by the vue framework. It can determine whether to display a certain object based on the true or false of a given expression. elements.

Different from the v-if directive, the v-show directive does not actually remove the element from the DOM, but controls its display and hiding by modifying the element's display attribute.

The specific code is as follows:

<template>
  <view>
    <text v-show="showElement">我是需要显示的元素</text>
    <text v-show="!showElement">我是需要隐藏的元素</text>
  </view>
</template>

<script>
export default {
  data() {
    return {
      showElement: true // 根据该值来决定元素的显示与隐藏
    }
  }
}
</script>

In the above code, we also define a showElement attribute. The value of this attribute determines the display and hiding of elements that require conditional rendering. If showElement is true, "I am the element that needs to be displayed" will be displayed; if showElement is false, "I am the element that needs to be hidden" will be displayed. It should be noted that switching the display and hiding of an element through the v-show instruction will not change the position of the element in the DOM.

Through the above two methods, we can easily control the display and hiding of page elements according to conditions in uniapp. Choosing the appropriate method based on actual needs can improve development efficiency and user experience.

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