VueJS渲染VNode

本文介绍了VueJS渲染VNode的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

给出一个VueJS VNode 对象，如何获取HTML元素

Given a VueJS VNode object, how do I get the HTML element that would be generated if it were rendered?

例如：

> temp1
VNode {tag: "h1", data: undefined, children: Array(1), text: undefined, elm: undefined, …}
> temp1.children[0]
VNode {tag: undefined, data: undefined, children: undefined, text: "Test", elm: undefined, …}
> doSomething(temp1)
<h1>Test</h1>

目标

我正在尝试在库周围构建一个小的VueJS包装器。

Goal

I'm attempting to build a small VueJS wrapper around the DataTables.net library.

要模仿标记中HTML表的行为，我想要以下内容：

To mimic the behavior of HTML tables in my markup, I want something like the following:

<datatable>
    <thead>
        <tr>
            <th>Name</th>
            <th>Age</th>
            <th>Salary</th>
        </tr>
    </thead>
    <tbody>
        <datatable-row v-for="person in people">
            <td>{{ person.name }}</td>
            <td>{{ person.age }}</td>
            <td>{{ person.salary }}</td>
        </datatable-row>
    </tbody>
</datatable>

我到目前为止所做的事情

我已开始按以下方式实施此操作：

What I've done so far

I've started to implement this as follows:

DataTable.vue

<template>
    <table ref="table" class="display table table-striped" cellspacing="0" width="100%">
        <slot></slot>
    </table>
</template>

<script>
/* global $ */
export default {
    data: () => ({
        instance: null
    }),
    mounted() {
        this.instance = $(this.$refs.table).dataTable();
        this.$el.addEventListener("dt.row_added", function(e) {
            this.addRow(e.detail);
        });
    },
    methods: {
        addRow(row) {
            // TODO <-----
            console.log(row);
        }
    }
};
</script>

DataTableRow.vue

<script>
/* global CustomEvent */
export default {
    mounted() {
        this.$nextTick(() => {
            this.$el.dispatchEvent(new CustomEvent("dt.row_added", {
                bubbles: true,
                detail: this.$slots.default.filter(col => col.tag === "td")
            }));
        });
    },
    render() { return ""; }
};

当前操作：

在加载页面时，将初始化DataTable。因此，列标题的格式正确，并且我在左下角看到显示0个条目中的0到0

CustomEvent 是能够冒泡通过< tbody> 并被 DataTable 元素成功（绕过VueJS中的限制，即您无法收听插槽上的事件）

What this currently does:

When the page loads, the DataTable is initialized. So the column headers are properly formatted and I see "Showing 0 to 0 of 0 entries" in the bottom left
The CustomEvent is able to bubble up past the <tbody> and be caught by the DataTable element successfully (circumventing the limitation in VueJS that you can't listen to events on slots)

实际上添加行

我的活动是给我一个 VNode 对象的数组。我的行中每列有一个 VNode 。 DataTables API具有 addRow 函数，可以这样调用：

My event is giving me an array of VNode objects. There's one VNode per column in my row. The DataTables API has an addRow function which can be called like so:

this.instance.row.add(["col1", "col2", "col3"]);

在我的情况下，我希望通过渲染VNode生成的元素成为其中的元素

In my case, I want the resultant element from the rendering of the VNode to be the elements in this array.

var elems = [];
for (var i = 0; i < row.length; i++)
    elems[i] = compile(row[i]);
this.instance.row.add(elems);

不幸的是，这种 compile 方法使我难以理解。我尝试浏览VueJS文档，并尝试使用Google搜索，但是没有骰子。我尝试手动传递 createElement 函数（传递给 render 方法的参数），但这引发了错误。

Unfortunately this compile method eludes me. I tried skimming the VueJS documentation and I tried Googling it, but no dice. I tried manually passing the createElement function (the parameter passed to the render method) but this threw an error. How can I ask VueJS to render a VNode without injecting the result into the DOM?

推荐答案

我如何遇到VueJS渲染VNode而不将结果注入DOM的问题？

I ran into the same issue wanting to do basically the same thing with a row details template for DataTables.net.

一个解决方案可能是创建一个通用组件，该组件呈现出一个 VNode。 并以编程方式实例化。这是我使用数据表的 row.child（） API插入的动态详细信息行的设置。

One solution could be to create a generic component that renders out a VNode and instantiate that programmatically. Here is how my setup for a dynamic detail row that I insert using datatable's row.child() API.

RenderNode.js

export default {
    props: ['node'],
    render(h, context) {
        return this.node ? this.node : ''
    }
}

数据表。 vue

从上方包括渲染器组件

import Vue from 'vue'
import nodeRenderer from './RenderNode'

实例化并挂载渲染器获取编译的HTML

Instantiate and mount the renderer to get the compiled HTML

// Assume we have `myVNode` and want its compiled HTML

const DetailConstructor = Vue.extend(nodeRenderer)

const detailRenderer = new DetailConstructor({
    propsData: {
        node: myVNode
    }
})

detailRenderer.$mount()
// detailRenderer.$el is now a compiled DOM element
row.child(detailRenderer.$el).show()

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