How to implement mini program template in uniapp

With the popularity of mini programs, more and more developers are beginning to try to use different frameworks and technologies to implement mini program development. Recently, uniapp, a cross-platform development framework, has gradually become the focus of everyone's attention. This article will introduce how uniapp implements mini program template.

1. What is template

In a mini program, template is a structural component that can be reused. By defining a template once, it can be used in different pages, thereby reducing The amount of code is reduced and development efficiency is improved. Unlike other components of the mini program, template does not support direct rendering and needs to be introduced through the import statement.

2. How uniapp implements template

Since uniapp is developed based on the Vue framework, the use of template is similar to Vue's template.

First, define a template component in uniapp. You need to add the name attribute to the template tag to identify the name of the component. For example:

<template name="myTemp">
  <div>{{msg}}</div>
</template>

Then, introduce the component through import in the applet page, and then use the component in the page. For example:

<template>
  <view>
    <import src="../template/myTemp"></import>
    <template is="myTemp" data="{{msg:&#39;Hello World!&#39;}}"></template>
  </view>
</template>

In the above code, we first introduced the myTemp component through the import statement, then used the component in the page, and passed a parameter "Hello World!" to the component through the data attribute. The final running effect is shown in the figure below:

\begin{figure}[ht]
\centering
\includegraphics[width=8cm]{uniapp-template}
\caption{uniapp implementation Mini program template}
\end{figure}

3. Advanced usage of template

In addition to the above basic usage, template also supports some advanced usage. The following are some common advanced usages:

1. Slot slot

The slot slot allows us to reserve some positions in the component to dynamically pass content into the parent component.

When defining a component, we can define the slot location through the slot tag. For example:

<template name="myTemp">
  <div>
    <slot name="header"></slot>
    {{msg}}
    <slot name="footer"></slot>
  </div>
</template>

Using this component in the parent component, we can use the slot attribute to insert content into the corresponding slot position. For example:

<template>
  <view>
    <import src="../template/myTemp"></import>
    <template is="myTemp">
      <view slot="header">Header</view>
      <view slot="footer">Footer</view>
    </template>
  </view>
</template>

In the above code, we inserted "Header" and "Footer" into the reserved slot positions in the component. The final running effect is shown in the figure below:

\begin{figure}[ht]
\centering
\includegraphics[width=8cm]{uniapp-template-slot}
\caption{ uniapp implements mini program template slot}
\end{figure}

2. Custom component events

In the mini program, we can trigger custom component events through the triggerEvent method . Similarly, in uniapp, we can also trigger events through the $emit method. The specific usage is as follows:

Define the event processing method in the component. For example:

<template name="myTemp">
  <button @click="handleClick">Click Me!</button>
</template>
<script>
  export default {
    methods: {
      handleClick() {
        this.$emit('myEvent')
      }
    }
  }
</script>

Use this component in the parent component and define the callback method of the component event. For example:

<template>
  <view>
    <import src="../template/myTemp"></import>
    <template is="myTemp" @myEvent="handleEvent"></template>
  </view>
</template>

<script>
  export default {
    methods: {
      handleEvent() {
        console.log('Event Triggered!')
      }
    }
  }
</script>

In the above code, we define a custom event named "myEvent" in the myTemp component and trigger the event through the $emit method in the handleClick method. Then use this component in the parent component and specify the callback method of the event through the @myEvent attribute. The final running effect is shown in the figure below:

\begin{figure}[ht]
\centering
\includegraphics[width=8cm]{uniapp-template-event}
\caption{ uniapp implements mini program template event}
\end{figure}

IV. Conclusion

This article briefly introduces how uniapp implements mini program template, as well as some advanced usage of template. By studying this article, readers can understand the basic usage and typical application scenarios of templates in uniapp, and help developers better use uniapp to develop small programs.

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