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Vue.js Conditional Rendering
v-if and v-show directives are used to conditionally render a block in Vue.js.
v-if
In vue.js, the directive v-if is used to conditionally render a block. The block will only be rendered if the directive's expression returns a truthy value.
Example :
<script setup> import { ref } from 'vue' const show = ref(true) </script> <template> <button>toggle</button> <h1 id="Vue-js">Vue.js</h1> </template>
You can use the v-else directive to indicate an "else block" for v-if. If the v-if directive expression does not return true, v-else block is rendered.
<script setup> import { ref } from 'vue' const show = ref(true) </script> <template> <button>toggle</button> <h1 id="v-if-directive"> v-if directive </h1> <h1 id="v-else-directive"> v-else directive </h1> </template>
v-else-if
The v-else-if, serves as an "else if block" for v-if. It can also be chained multiple times. When v-if and v-else-if do not evaluate to true, the v-else directive is triggered.
<p v-if="currentState === 0">State 0: Message 1</p> <p v-else-if="currentState === 1">State 1: Message 2</p> <p v-else-if="currentState === 2">State 2: Message 3</p> <p v-else>State 3: Message 4</p>
v-show
When we want to display an item conditionally, we can use the v-show directive as another option.
<h1 id="Ok">Ok!</h1>
The difference is that an element with a v-show is always rendered and remains in the DOM. v-show changes the CSS display property to show or hide the element. v-show doesn't work with v-else
v-if vs. v-show
v-if is "real" conditional rendering because it ensures that event listeners and child components inside the conditional block are properly destroyed and re-created during toggles.
v-if : if the condition is false on initial render, it will not do anything - the conditional block won't be rendered until the condition becomes true for the first time.
v-show is always rendered and remains in the DOM. v-show changes the CSS display property to show or hide the element. v-show doesn't work with v-else
v-if has higher toggle costs while v-show has higher initial render costs. prefer v-show if you need to toggle something very often, and prefer v-if if the condition is unlikely to change at runtime.
Conclusion
In this article, we examined the features and differences of v-if and v-show directives. Understanding these distinctions is essential for optimizing rendering performance and managing element visibility in your Vue.js applications.
The above is the detailed content of Vue.js Conditional Rendering and V-if vs V-show. For more information, please follow other related articles on the PHP Chinese website!

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