How to use v-if and v-else to render conditional content in Vue

Vue is a popular front-end development framework that provides a variety of instructions to help us manage the dynamic content of our applications. Two of the instructions, v-if and v-else, are used to render content based on conditions.

The v-if directive allows us to embed a Boolean expression in the template, and the corresponding content will be rendered only when the expression is true. When the expression is false, nothing is rendered.

For example, in the Vue template, we can use the v-if directive in the following way:

<div v-if="isMaster">{{ message }}</div>

In the above code, we control the display of text content through the isMaster variable. If isMaster is true, the message value will be rendered on the page. If isMaster is false, the div will not be rendered.

In addition to the v-if directive, Vue also provides a v-else directive. v-else can only follow the v-if directive and is used to specify the content that should be rendered when the expression of v-if is false.

For example, in a Vue template, we can use both v-if and v-else directives in the following way:

<div v-if="isMaster">{{ message }}</div>
{{ errMsg }}

In the above code, if isMaster is true, the first The text content in each div will be rendered. If isMaster is false, the text content in the second div will be displayed and the first div will not be displayed.

In addition, Vue also provides a v-else-if directive for switching rendering content among multiple conditions.

For example, in a Vue template, we can use the v-if, v-else-if and v-else directives simultaneously in the following way:

<div v-if="isMaster">{{ message }}</div>
{{ teacherMsg }}
{{ errMsg }}

In the above code, if isMaster If true, the text content in the first div will be rendered. If isMaster is false and isTeacher is true, the text content in the second div will be displayed. If both isMaster and isTeacher are false, the text content in the third div will be displayed.

In summary, using v-if, v-else and v-else-if directives in Vue can help us render specific content to the page based on conditions. Using these directives improves the ability to adapt to various environments and add conditional code when needed. Also, be sure to test when using these directives to ensure that the rendered conditional content displays correctly.

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