vue-render函数的三个参数-CSDN博客
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第一个参数(必须) - {String | Object | Function}
Vue.component('elem', {
render: function(createElement) {
return createElement('div');//一个HTML标签字符
/*return createElement({
template: '<div></div>'//组件选项对象
});*/
/*var func = function() {
return {template: '<div></div>'}
};
return createElement(func());//一个返回HTML标签字符或组件选项对象的函数*/
}
});第二个参数(可选) - {Object}
Vue.component('elem', {
render: function(createElement) {
var self = this;
return createElement('div', {//一个包含模板相关属性的数据对象
'class': {
foo: true,
bar: false
},
style: {
color: 'red',
fontSize: '14px'
},
attrs: {
id: 'foo'
},
domProps: {
innerHTML: 'baz'
}
});
}
});第三个参数(可选) - {String | Array}
Vue.component('elem', {
render: function(createElement) {
var self = this;
// return createElement('div', '文本');//使用字符串生成文本节点
return createElement('div', {},[//由createElement函数构建而成的数组
createElement('h1', '主标'),//createElement函数返回VNode对象
createElement('h2', '副标')
]);
}
});与template写法对比
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>render</title>
<script src="https://cdn.bootcss.com/vue/2.3.4/vue.js"></script>
</head>
<body>
<div id="app">
<ele></ele>
</div>
<script>
/*Vue.component('ele', {
template: '<div id="elem" :class="{show: show}" @click="handleClick">文本</div>',
data: function() {
return {
show: true
}
},
methods: {
handleClick: function() {
console.log('clicked!');
}
}
});*/
Vue.component('ele', {
render: function(createElement) {
return createElement('div', {
'class': {
show: this.show
},
attrs: {
id: 'elem'
},
on: {
click: this.handleClick
}
}, '文本');
},
data: function() {
return {
show: true
}
},
methods: {
handleClick: function() {
console.log('clicked!');
}
}
});
new Vue({
el: '#app'
});
</script>
</body>
</html>this.$slots用法
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>render</title>
<script src="https://cdn.bootcss.com/vue/2.3.4/vue.js"></script>
</head>
<body>
<div id="app">
<blog-post>
<h1 slot="header"><span>About Me</span></h1>
<p>Here's some page content</p>
<p slot="footer">Copyright 2016 Evan You</p>
<p>If I have some content down here</p>
</blog-post>
</div>
<script>
Vue.component('blog-post', {
render: function(createElement) {
var header = this.$slots.header,//返回由VNode组成的数组
body = this.$slots.default,
footer = this.$slots.footer;
return createElement('div', [
createElement('header', header),
createElement('main', body),
createElement('footer', footer)
])
}
});
new Vue({
el: '#app'
});
</script>
</body>
</html>使用props传递数据
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>render</title>
<script src="https://cdn.bootcss.com/vue/2.3.4/vue.js"></script>
</head>
<body>
<div id="app">
<ele :show="show"></ele>
<ele :show="!show"></ele>
</div>
<script>
Vue.component('ele', {
render: function(createElement) {
if (this.show) {
return createElement('p', 'true');
} else {
return createElement('p', 'false');
}
},
props: {
show: {
type: Boolean,
default: false
}
}
});
new Vue({
el: '#app',
data: {
show: false
}
});
</script>
</body>
</html>v-model指令
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>render</title>
<script src="https://cdn.bootcss.com/vue/2.3.4/vue.js"></script>
</head>
<body>
<div id="app">
<el-input :name="name" @input="val=>name=val"></el-input>
<div>你的名字是{{name}}</div>
</div>
<script>
Vue.component('el-input', {
render: function(createElement) {
var self = this;
return createElement('input', {
domProps: {
value: self.name
},
on: {
input: function(event) {
self.$emit('input', event.target.value);
}
}
})
},
props: {
name: String
}
});
new Vue({
el: '#app',
data: {
name: 'hdl'
}
});
</script>
</body>
</html>作用域插槽
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>render</title>
<script src="https://cdn.bootcss.com/vue/2.3.4/vue.js"></script>
</head>
<body>
<div id="app">
<ele>
<template scope="props">
<span>{{props.text}}</span>
</template>
</ele>
</div>
<script>
Vue.component('ele', {
render: function(createElement) {
// 相当于<div><slot :text="msg"></slot></div>
return createElement('div', [
this.$scopedSlots.default({
text: this.msg
})
]);
},
data: function() {
return {
msg: '来自子组件'
}
}
});
new Vue({
el: '#app'
});
</script>
</body>
</html>向子组件中传递作用域插槽
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>render</title>
<script src="https://cdn.bootcss.com/vue/2.3.4/vue.js"></script>
</head>
<body>
<div id="app">
<ele></ele>
</div>
<script>
Vue.component('ele', {
render: function(createElement) {
return createElement('div', [
createElement('child', {
scopedSlots: {
default: function(props) {
return [
createElement('span', '来自父组件'),
createElement('span', props.text)
];
}
}
})
]);
}
});
Vue.component('child', {
render: function(createElement) {
return createElement('b', this.$scopedSlots.default({text: '我是组件'}));
}
});
new Vue({
el: '#app'
});
</script>
</body>
</html>函数化组件
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>render</title>
<script src="https://cdn.bootcss.com/vue/2.3.4/vue.js"></script>
</head>
<body>
<div id="app">
<smart-item :data="data"></smart-item>
<button @click="change('img')">切换为图片为组件</button>
<button @click="change('video')">切换为视频为组件</button>
<button @click="change('text')">切换为文本组件</button>
</div>
<script>
// 图片组件选项
var ImgItem = {
props: ['data'],
render: function(createElement) {
return createElement('div', [
createElement('p', '图片组件'),
createElement('img', {
attrs: {
src: this.data.url
}
})
]);
}
}
// 视频组件
var VideoItem = {
props: ['data'],
render: function(createElement) {
return createElement('div', [
createElement('p', '视频组件'),
createElement('video', {
attrs: {
src: this.data.url,
controls: 'controls',
autoplay: 'autoplay'
}
})
]);
}
};
/*纯文本组件*/
var TextItem = {
props: ['data'],
render: function(createElement) {
return createElement('div', [
createElement('p', '纯文本组件'),
createElement('p', this.data.text)
]);
}
};
Vue.component('smart-item', {
functional: true,
render: function(createElement, context) {
function getComponent() {
var data = context.props.data;
if (data.type === 'img') return ImgItem;
if (data.type === 'video') return VideoItem;
return TextItem;
}
return createElement(
getComponent(),
{
props: {
data: context.props.data
}
},
context.children
)
},
props: {
data: {
type: Object,
required: true
}
}
});
new Vue({
el: '#app',
data() {
return {
data: {}
}
},
methods: {
change: function(type) {
if (type === 'img') {
this.data = {
type: 'img',
url: 'https://raw.githubusercontent.com/iview/iview/master/assets/logo.png'
}
} else if (type === 'video') {
this.data = {
type: 'video',
url: 'http://vjs.zencdn.net/v/oceans.mp4'
}
} else if (type === 'text') {
this.data = {
type: 'text',
content: '这是一段纯文本'
}
}
}
},
created: function() {
this.change('img');
}
});
</script>
</body>
</html>
渲染动态表单用法
<template>
<div>
<form>
<div v-for="(field, index) in fields" :key="index">
<component :is="field.type" :name="field.name" :label="field.label" :options="field.options" v-model="form[field.name]" />
</div>
</form>
</div>
</template>
<script>
import Vue from 'vue';
export default {
data() {
return {
form: {},
fields: [
{ type: 'text', name: 'username', label: '用户名' },
{ type: 'password', name: 'password', label: '密码' },
{ type: 'select', name: 'gender', label: '性别', options: [{ value: 'male', label: '男' }, { value: 'female', label: '女' }] },
{ type: 'checkbox', name: 'hobbies', label: '爱好', options: [{ value: 'reading', label: '阅读' }, { value: 'music', label: '音乐' }, { value: 'sports', label: '运动' }] },
{ type: 'radio', name: 'status', label: '状态', options: [{ value: 'active', label: '激活' }, { value: 'inactive', label: '未激活' }] },
],
};
},
render(h) {
const self = this;
const fields = self.fields.map((field) => {
const props = {
props: {
name: field.name,
label: field.label,
options: field.options,
value: self.form[field.name],
},
on: {
input: (value) => {
self.form[field.name] = value;
},
},
};
return h(field.type, props);
});
return h('div', fields);
},
};
</script>
<style>
/* 样式省略 */
</style>
在示例代码中我们定义了一个表单组件其中的 `fields` 数组包含了表单中的各个字段每个字段都有一个 `type` 属性表示字段的类型例如文本框、密码框、下拉框等。在 `render` 函数中我们使用 `map` 方法遍历 `fields` 数组根据每个字段的类型动态生成对应的组件并将组件的属性和事件绑定到表单数据中。最后我们将所有生成的组件包裹在一个 `div` 元素中返回。
需要注意的是由于在 `render` 函数中动态生成了组件因此在模板中无法直接使用这些组件。如果需要在模板中使用这些组件可以通过在 `render` 函数中将生成的组件保存到一个数组中然后在模板中使用 `v-for` 渲染这个数组。
希望这个示例能帮助您理解如何使用 Vue 的 render 函数渲染动态表单。如有任何问题请随时提问。