vue data hide display

In Vue development, we often encounter the need to hide or display data. For example, we may need to hide some sensitive data under certain circumstances or display certain data when conditions are met. Vue provides a variety of ways to hide and display data. Next, we will introduce these methods.

1. Conditional Rendering

Vue’s conditional rendering instructions can add v-if or v-show instructions to the DOM element to control whether the DOM element is true or false based on the condition. show. The usage of these two instructions is different: the

v-if instruction removes or re-adds elements from the DOM to the DOM, so it can be used to handle more intensive operations or involve a large number of sub-components. Case.

The v-show directive hides and displays elements through the display attribute of CSS. Because the element itself always exists in the DOM, the v-show directive handles both lightweight operations and ordinary operations more efficiently.

The following is a simple example:

<template>
  <div>
    <p v-if="showText">这里是需要隐藏的文本。</p>
    <p v-show="showText">这里是需要显示的文本。</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      showText: false,
    }
  },
}
</script>

In this example, we declare a data attribute named showText. According to the value of showText, we can control the display and hiding of text through the v-if and v-show instructions.

2. computed attribute

If we need to dynamically control the display and hiding of certain elements based on the state of data attributes, the computed attribute is a good choice. Computed properties are computed properties in Vue, they are only recalculated when the data properties they depend on change. We can use the computed attribute to calculate the logic that controls the display and hiding of elements.

The following is an example of using the computed attribute:

<template>
  <div>
    <p v-if="showText">这里是需要隐藏的文本。</p>
    <p v-show="showTextComputed">这里是需要显示的文本。</p>
    <button @click="toggleShowText">切换显示状态</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      showText: false,
    }
  },
  computed: {
    showTextComputed() {
      // 根据数据状态来计算是否显示元素
      return this.showText ? true : false
    },
  },
  methods: {
    toggleShowText() {
      // 切换showText的数据状态
      this.showText = !this.showText
    },
  },
}
</script>

In this example, we declare a computed attribute showTextComputed to calculate the displayed and hidden states of the element. By switching the value of showText using the toggleShowText method, we can dynamically control the calculation results of the computed attribute.

3. slot

Vue’s slot mechanism allows child components to insert content on parent components. By using slots, you can provide custom HTML content and styles for child components in the parent component. We can hide and display data through the slot mechanism.

The following is an example of using slot to hide and display content:

<template>
  <div>
    <content v-if="showText">
      <p>这里是需要隐藏的文本。</p>
    </content>
    <content v-show="showText">
      <p>这里是需要显示的文本。</p>
    </content>
    <button @click="toggleShowText">切换显示状态</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      showText: false,
    }
  },
  methods: {
    toggleShowText() {
      this.showText = !this.showText
    },
  },
}
</script>

In this example, we use the content tag as the slot and display the corresponding content based on the data status. Through the toggleShowText method, we can dynamically switch the data state to control the display and hiding of content.

Summary

Here are three different ways to hide and show data. Conditional rendering is the most common processing method, which can render and delete DOM elements based on the state of data. The computed attribute is suitable for situations where the state of the data needs to be calculated. The slot mechanism is suitable for situations where you need to provide custom styles and HTML content for child components. In Vue development, we can flexibly choose a method that suits us according to different needs to hide and display data.

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