How can I use conditional rendering in Vue.js with the template tag?

I have been diving into learning vue.js by referencing the documentation available on Vue.js Reference Doc.

Following the examples provided, I encountered an issue with the example in the conditional part.

Here is the code snippet that didn't work for me:

<template id="app-3">
<div v-if="ok">
    <h1>Title</h1>
    <p>Paragraph 1</p>
    <p>Paragraph 2</p>
</div>
</template>
<script src="vue.js"></script>
<script>
    var app = new Vue({
        el : '#app-3',
        data : {
            ok : true
        }
    });
</script>

The above code did not work as expected.

However, when I tried this alternative version of the code below, it worked fine:

<transition id="app-3">
    <template v-if="ok">
        <div>
            <h1>Title</h1>
            <p>Paragraph 1</p>
            <p>Paragraph 2</p>
        </div>
    </template>
</transition>
<script src="vue.js"></script>
<script>
    var app = new Vue({
        el : '#app-3',
        data : {
            ok : true
        }
    });
</script>

I am curious to understand why the first code snippet didn't behave as expected!

Answer №1

@xyiii pointed out the console error that was displayed.

In response to @xyiii's comment:

Is the Vue.js Doc example incorrect?

No. They are simply illustrating a scenario where you need to toggle multiple elements based on the same property.

Instead of structuring it like this:

Title Paragraph 1 Paragraph 2

You can group them within a template tag and organize it like this:

<template v-if="ok">
<h1>Title</h1>
<p>Paragraph 1</p>
<p>Paragraph 2</p>
</template>

The <template> tag acts as a placeholder and is not rendered on the DOM.

Having two root elements by accident can look like this:

<template v-if="ok">
    <div>Root element 1</div>
    <div>Root element 2</div>
</template>

This causes an error in Vue to prevent such instances.

To understand why only one root element is necessary, refer to @LinusBorg's comment here.

Answer №2

While using the debugging console:

An error message states that you cannot use <template> as the component root element because it has the potential to contain multiple nodes.

The solution is to have a single root element. Since the template tag allows for multiple elements, it is not suitable as the root element in Vue.

Instead, opt for a div and your revised example will function correctly:

<div id="app-3">
  <div v-if="ok">
    <h1>Title</h1>
    <p>Paragraph 1</p>
    <p>Paragraph 2</p>
  </div>
</div>

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