条件渲染：组件或数据

Question

I'm trying to make editor functionality for page with Vue2. On a page there is a 'editable' filter. It recieves content_id. Using this content_id we should recieve data from root Vue instance (for example pageContent.mainTitle). Depending on editModeOn root variable we should render component or just output appropriate (for example <editable content="mainTitle" /> or content in mainTitle key).

Skeleton of HTML:

<div id="root">
    {{ 'mainContent' | editable }}

    <label class="checkbox">
        <input type="checkbox" v-model="editModeOn">
        Switch edit mode
    </label>
</div>

And a Vue instance:

new Vue({
    el: '#root',
    data: {
        editModeOn: true,
        pageContent: {
            mainTitle: "Test title",
            mainContent: "Lorem ipsum dolor sit amet, consectetur adipisicing elit. At, et!"
        }
    },
    filters: {
        editable(contentId) {
            if (!this.editModeOn) {
                return `<editable content="{{ this.pageContent[contentId] }}" />`;
            } else {
                return this.pageContent[contentId];
            }
        }
    }
});

The reason why I'm trying to achieve that functionality using filters is because of when edit mode disabled I don't want to make any wrapper like span or div (as it nesessary as root instance of any component).

Maybe it's a better way to achieve nesessary functionality, but I didn't find it. Has anyone an idea how to make this work? Thanks!

Answer 1

If I understand the problem correctly, you can solve this with a template . A template tag is not rendered.

<div id="root">
    <template v-if="!editModeOn">
      {{pageContent['mainContent']}}
    </template>
    <editable v-else :content="pageContent['mainContent']" />

    <label class="checkbox">
        <input type="checkbox" v-model="editModeOn">
        Switch edit mode
    </label>
</div>

Answer 2

Looking at the html, the contentId is hard-coded into the div, so I presume you'd have many such divs on the page. I'd make a component and pass in 'content' attribute.
Switching between edit and display can be with v-show

Vue.component('editable', {
  template: `
    <div>
      <div v-show="!editModeOn">{{ content }}</div>
      <div v-show="editModeOn">
        <input :value="content" @input="$emit('update:content', $event.target.value)"></input>
      </div>

      <label class="checkbox">
         <input type="checkbox" v-model="editModeOn">
        Switch edit mode
      </label>
    </div>
  `,
  props: ['content'],
  data {
    editModeOn: false
  }
})

On the main page

<editable :content.sync="pageContent['mainTitle']"></editable>    
<editable :content.sync="pageContent['mainContent']"></editable>

or perhaps

<editable v-for="item in pageContent" content.sync="item"></editable>    

Some notes:

Using v-show instead of v-if means the user can toggle back and forth between show and edit as desired, v-show keeps the edit in memory between mode but v-if destroys the edit node.

Using the .sync modifier allows the edits to be passed up to the parent, see .sync

I haven't tested this, so it may need some tweaking, but you get the idea. See working example codepen