How to use vuejs slot
How to use vuejs slot: 1. Put some DOM in the sub-component; 2. Display or hide the DOM through slot, code such as "new Vue({el: "#app",data: {} ,components:{children:{...}}}) ”.
The operating environment of this article: Windows 7 system, vue version 2.9.6, DELL G3 computer.
Use of slots in vuejs
Overview:
If the parent component needs to put some DOM in the child component, then these DOM are Displaying or hiding, where to display, and how to display are all the responsibility of slot distribution.
Distributed in the following situations:
##
<p> <children> <span>我是slot内容</span> <!--这行不会显示--> </children> </p> <script> new Vue({ el: "#app", data: { }, components: { children: { //这个无返回值,不会继续派发 template: "<button>为了明确作用范围,所以使用button标签" } } }) </script>
Single slot:
<p> <children> <span>我是slot内容</span> <!--这行不会显示--> </children> </p> <script> new Vue({ el: "#app", data: { }, components: { children: { //这个无返回值,不会继续派发 template: "<button><slot>为了明确作用范围,所以使用button标签" } } }) </script>
即父组件放在子组件里的内容,插到了子组件<slot></slot>位置; 注意:即使有多个标签,会一起被插入,相当于在父组件放在子组件里的标签,替换了<slot></slot>这个标签。 例如:<p> <children> <span>我是slot内容</span> <p>测试测试</p> <em>我是测试的</em> <!--这行不会显示--> </children> </p> <script> new Vue({ el: "#app", data: { }, components: { children: { //这个无返回值,不会继续派发 template: "<button><slot>为了明确作用范围,所以使用button标签" } } }) </script>
D:具名slot:将放在子组件里的不同html标签放到不同位置,父组件在要发布的标签里添加slot=”name名”属性,子组件在对应分发的位置的slot标签里,添加name=”name名”属性,然后就会将对应的标签放在对应位置了。 例如:<p> <children> <span>12345</span> <span>56789</span> </children> </p> <script> new Vue({ el: "#app", data: { }, components: { children: { //这个无返回值,不会继续派发 template: "<button><slot name='first'>为了明确作用范围<slot name='third'>所以使用button标签" } } }) </script>
E:分发内容的作用域: 被分发的内容的作用域,根据其所在模块决定,例如:<p> <children> <span>12345</span> <span>56789</span> </children> </p> <script> new Vue({ el: "#app", data: { }, components: { children: { //这个无返回值,不会继续派发 template: "<button><slot name='first'>为了明确作用范围<slot name='third'>所以使用button标签" } }, methods: { test: function() { console.log("我是first点击打印的内容"); } } }) </script>点击按钮12345的区域时(而不是全部按钮),会触发父组件的test方法,然后打印“我是first点击打印的内容”。但是点击其他区域则没有影响。
F:当没有分发内容时的提示:假如父组件没有在子组件中放置有标签,或者是父组件在子组件中放置标签,但有slot属性,而子组件中没有slot属性的标签。那么子组件的slot标签,将不会起任何作用。除非,该slot标签内有内容,那么在无分发内容的时候,会显示该slot标签内的内容。 例如:<p> <children> <span>【12345】</span> </children> </p> <script> new Vue({ el: "#app", data: { }, components: { children: { //这个无返回值,不会继续派发 template: "<p><slot name='first'><button>【没内容显示1】为了明确作用范围,<slot name='last'><button>【没内容显示2】所以使用button标签" } } }) </script>
如果改为:<p> <children> <span>【12345】</span> </children> </p> <script> new Vue({ el: "#app", data: { }, components: { children: { //这个无返回值,不会继续派发 template: "<p><slot name='first'><button>【没内容显示1】为了明确作用范围,<slot name='last'><button>【没内容显示2】所以使用button标签" } } }) </script>
说明:a、name=”first”的slot标签被父组件对应的标签所替换(slot标签内部的内容被舍弃) b、name=”last”的slot标签,因为没有对应内容,则显示该slot标签内部的内容。 G、假如想控制子组件根标签的属性【1】首先,由于模板标签是属于父组件的,因此,将子组件的指令绑定在模板标签里,是不可以的(因为其归属于父组件) 【2】假如需要通过父组件控制子组件是否显示(例如v-show或v-if),那么这个指令显然是属于父组件的,可以将标签写在子组件的模板上。例如:<p> <button>点击让子组件显示</button> <children></children> </p> <script> new Vue({ el: "#app", data: { abc: false }, methods: { toshow: function() { this.abc = !this.abc; } }, components: { children: { //这个无返回值,不会继续派发 template: "<p>这里是子组件" } } }) </script>
点击之后:
说明:通过父组件(点击按钮,切换v-if指令的值)控制子组件是否显示。 【3】假如需要通过子组件,控制子组件是否显示(比如隐藏)那么这个指令显然是属于子组件的(会将值放在子组件的data属性下)那么就必须放置在子组件的根标签中。 例如:<p> <button>点击让子组件显示</button> <children> <span>【12345】</span> <!--上面这行不会显示--> </children> </p> <script> new Vue({ el: "#app", methods: { toshow: function() { this.$children[0].tohidden = true; } }, components: { children: { //这个无返回值,不会继续派发 template: "<p v-if='tohidden' @click='tohide'>这里是子组件", data: function() { return { tohidden: true } }, methods: { tohide: function() { this.tohidden = !this.tohidden; } } } } }) </script>
##Click "Here are the child components "After:
Click "Click to make the subcomponent display":
Click the button of the parent component to redisplay the child component by changing the tohidden attribute of the child component. The instructions of the subcomponent are bound to the template of the subcomponent (so they can be called).
Recommended learning: "
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