How does uniapp dynamically control the display and hiding of elements?

In Uniapp, we often need to show or hide some page elements based on user operations or other conditions. For example, when a user clicks a button, we need to display a pop-up window, or dynamically display a login or registration button based on whether the user is logged in. In this case, we can use the v-show command provided by Uniapp to dynamically control the display and hiding of elements.

The use of the v-show instruction is very simple. You can add the v-show instruction to the element that needs to be controlled, and then set the value of the instruction to a Boolean value. If the value is true, the element will be displayed. Otherwise the element is hidden. For example, we can control the display and hiding of a pop-up window on a button:

<template>
  <view>
    <button @click="showDialog=true">显示弹窗</button>
    <view v-show="showDialog">这里是弹窗</view>
  </view>
</template>

In this example, we set the showDialog variable to true on the click event of the button, so that the pop-up window can be displayed. . On the pop-up window element, we use the v-show command to control the display and hiding of the pop-up window. If the value of the showDialog variable is true, the pop-up window is displayed, otherwise the pop-up window is hidden.

In addition to using variables to control the value of the v-show directive, you can also use expressions to control the value of v-show. For example, we can control the display or hiding of a button based on whether the user is logged in:

<template>
  <view>
    <button v-show="isLoggedIn">已登录</button>
    <button v-show="!isLoggedIn">未登录</button>
  </view>
</template>

In this example, we control the display and hiding of two buttons based on the value of the isLoggedIn variable. If this variable is true, the "Logged in" button is displayed, otherwise the "Not logged in" button is displayed.

In short, the v-show command is a good helper for us to dynamically control the display and hiding of elements in Uniapp. By using the v-show directive appropriately, we can make page elements show different states under different circumstances, thereby providing users with a better user experience.

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