Learn about slots in Vue

Vue slots are an indispensable part of learning Vue. When I first came into contact with Vue, I had only a little understanding of these, especially the scope slots.

Later I found the slots more and more useful.

Share some knowledge about slots.

1. Slot content

One sentence: The slot can contain any content.

First look at the following code: declare a child-component component,

If now I want to place some content inside , the result What will it be like?

<div id="app">
    <child-component></child-component>

</div>
<script>
    Vue.component(&#39;child-component&#39;,{
        template:`
            <div>Hello,World!</div>
        `
    })
    let vm = new Vue({
        el:&#39;#app&#39;,
        data:{

        }
    })
</script>

<child-component>你好</child-component>

The output content is still the content in the component, and the content written in has no effect.

We now add a slot to the component

We are in-The "Hello" written in -component> works! ! !

Vue.component('child-component',{
        template:`
            <div>
            Hello,World!
            <slot></slot>
            </div>
        `
    })

Now, we know what a slot is:

The slot is a set of content distribution API implemented by Vue, which will The element serves as an outlet for carrying distributed content.

What this sentence means is that if there is no slot, some content in the component tag will not have any effect. When I declare the slot element in the component, in the component element The content written inside will go to it!

2. Named slot

The named slot is to give the slot a name

In the component, I give the slot a name There are three names, one is called "girl", one is called "boy", and one has no name.

Then in , the content corresponding to the slot attribute will correspond one-to-one with the name in the component.

The one without a name is the default slot! !

<div id="app">
    <child-component>
        <template slot="girl">
            漂亮、美丽、购物、逛街
        </template>
        <template slot="boy">
            帅气、才实
        </template>
        <div>
            我是一类人，
            我是默认的插槽
        </div>
    </child-component>
</div>
<script>
    Vue.component(&#39;child-component&#39;,{
        template:`
            <div>
            <h4 id="这个世界不仅有男人和女人">这个世界不仅有男人和女人</h4>

            <slot name="girl"></slot>

            <div style="height:1px;background-color:red;"></div>

            <slot name="boy"></slot>

            <div style="height:1px;background-color:red;"></div>

            <slot></slot>
            </div>
        `
    })
    let vm = new Vue({
        el:&#39;#app&#39;,
        data:{

        }
    })
</script>

3. Scope slot

I never understood what a scope slot is before! ! !

To put it bluntly, it is my attribute on the component, which can be used within the component element!

Let’s look at the simplest example first! !

We define an attribute say on the element (define it as you like!), then use the component child, and then add the attribute slot-scope to the template element! ! Just name it a

We print a and find that it is {"say" : "Hello"}, which is the key-value pair composed of the attributes and values ​​on the slot! ! !

This is the scope slot!

I can use the attributes/values ​​on the component on the component element! !

<div id="app">
    <child>
        <template slot-scope="a">
　　　　　　<!-- {"say":"你好"} -->

            {{a}}
        </template>
    </child>
</div>
<script>
    Vue.component(&#39;child&#39;,{
        template:`
            <div>
                <slot say="你好"></slot>
            </div>
        `
    })

    let vm = new Vue({
        el:&#39;#app&#39;,
        data:{

        }
    })
</script>

Look at the following example again:

<div id="app">
    <child :lists="nameList">
        <template slot-scope="a">
            {{a}}
        </template>
    </child>
</div>
<script>
    Vue.component(&#39;child&#39;,{
        props:[&#39;lists&#39;],
        template:`
            <div>
                <ul>
                    <li v-for="list in lists">
                        <slot :bbbbb="list"></slot>
                    </li>
                </ul>
            </div>
        `
    })

    let vm = new Vue({
        el:&#39;#app&#39;,
        data:{
            nameList:[
            {id:1,name:&#39;孙悟空&#39;},
            {id:2,name:&#39;猪八戒&#39;},
            {id:3,name:&#39;沙和尚&#39;},
            {id:4,name:&#39;唐僧&#39;},
            {id:5,name:&#39;小白龙&#39;},
            ]
        }
    })
</script>

Look at the output result

##Related recommendations:

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vue tutorial recommendation: 2020 latest 5 vue.js video tutorial selection

For more programming-related knowledge, please visit:

Introduction to Programming! !

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