Meteor Blaze在Template.onCreated中访问Template.contentBlock

Jan*_*nkt 7 javascript meteor spacebars meteor-blaze html-templates

我正在为孩子们写一个定制的Blaze块助手:

<template name="parent">
    {{> Template.contentBlock ..}}
</template>

<template name="child">
    {{> Template.contentBlock ..}}
</template>
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我的预期用例是拥有一个带有任意子节点的模板,我在html文件中定义.

{{#parent}}

  {{#child id="child1" title="Child 1"}}
    <p>This is content of child 1</p>
  {{/child}}

  {{#child id="child2" title="Child 2"}}
    <p>This is content of child 2</p>
  {{/child}}

  {{#child id="childN" title="Child N"}}
    <p>This is content of child N</p>
  {{/child}}

{{/parent}}
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到目前为止没问题.但是,在父模板中onCreated/ autorun我想要访问child模板.我想使用这些数据在父模板元素中动态创建

Template.parent.onCreated(function () {
    const instance = this;
    instance.state = new ReactiveDict();

    instance.autorun(function () {
        const contentBlocks = // how?
        instance.state.set("children", contentBlocks);
    });
});

Template.parent.helpers({
    children() {
        return Template.instance().state.get("children");
    }
});
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children将在使用parent模板如下:

{{#parent}}

  {{#each children}}
    do something with {{this.value}}
  {{/each}}      

  {{#child id="child1" title="Child 1"}}
    <p>This is content of child 1</p>
  {{/child}}

  {{#child id="child2" title="Child 2"}}
    <p>This is content of child 2</p>
  {{/child}}

  {{#child id="childN" title="Child N"}}
    <p>This is content of child N</p>
  {{/child}}

{{/parent}}
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我不想要的是访问contentBlock的内容(<p>),而是获取添加的child模板列表.

使用当前的Template/Blaze API可以实现吗?该文档是有点薄上这一点.

它基本上与这篇文章相反:如何获取父模板实例(当前模板)


编辑1:使用父视图的渲染功能(仅部分工作)

我找到了一种方法来获取parent模板的孩子而不是他们的data反应:

// in Template.parant.onCreated -> autorun
const children = instance.view.templateContentBlock.renderFunction()
    .filter(child => typeof child === 'object')
    .map(el => Blaze.getData(el._render()));
console.log(children);
// null, null, null because Blaze.getData(view) does return null
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我找到的另一种方法是使用共享,ReactiveVar但两者似乎都不够干净.我只想获取父js代码中的Template实例列表.


编辑2:使用共享的ReactiveVar(仅部分工作)

ReactiveVar只要它在两个模板的范围内,就可以使用共享:

const _cache = new ReactiveVar({});

Template.parent.onCreated(function () {
    const instance = this;
    instance.state = new ReactiveDict();

    instance.autorun(function () {
        const children = Object.values(_cache.get());
        instance.state.set("children", children);
    });
});

Template.parent.helpers({
    children() {
        return Template.instance().state.get("children");
    }
});
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工作(但只渲染一次,不反应):

Template.child.onCreated(function () {
    const instance = this;
    const data = Template.currentData();
    const cache = _cache.get();
    cache[data.id] = data;
    _cache.set(cache);
});
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不工作(子自动运行是设置值,但不呈现新值):

Template.child.onCreated(function () {
    const instance = this;
    instance.autorun(function() {
        const instance = this;
        const data = Template.currentData();
        const cache = _cache.get();
        cache[data.id] = data;
        _cache.set(cache);
    });
});
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小智 6

这是我想出来的.请告诉我这是你想要的还是我误解了.

main.html中:

<body>
    {{> content}}
</body>

<template name="content">
    {{#parent}}

        {{#each children}}
            <p>do something with {{this.id}}</p>
            <p>data: {{this.tmpl.data.title}}</p>
        {{/each}}

        {{#child id="child1" title="Child 1" parentTemplate=this.parentTemplate}}
            <p>This is content of child 1</p>
        {{/child}}

        {{#child id="child2" title="Child 2" parentTemplate=this.parentTemplate }}
            <p>This is content of child 2</p>
        {{/child}}

        {{#child id="childN" title="Child N" parentTemplate=this.parentTemplate }}
            <p>This is content of child N</p>
        {{/child}}

    {{/parent}}
</template>

<template name="parent">
    {{> Template.contentBlock parentTemplate=template}}
</template>

<template name="child">
    {{> Template.contentBlock }}
</template>
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main.js

import { Template } from 'meteor/templating';
import { ReactiveVar } from 'meteor/reactive-var';

import './main.html';

Template.content.helpers({
    children() {
        return this.parentTemplate.children.get();
    },
});

Template.parent.onCreated(function () {
    this.children = new ReactiveVar([]);
});

Template.parent.helpers({
    template() {
        return Template.instance();
    }
});

Template.child.onRendered(function () {
    const children = this.data.parentTemplate.children.get();
    children.push({ id: this.data.id, tmpl: this });
    this.data.parentTemplate.children.set(children);
});
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输出:

在此输入图像描述

虽然它使用的ReactiveVar是不理想的,它不依赖于任何全局,你可以将你的代码放在不同的文件中,没问题.