Attributes for 'v-bind' directives must have a value specified

Struggling to implement a tree structure in vue.js and encountering an issue with element props. Any assistance would be greatly appreciated.

I've attempted using :content="{{tempCont}}" as well as content="{{tempCont}}", but neither approach proved successful.

Below is where the tree element is being utilized:

<div id="tree">
    <treeItem :title="Parent" :content="{{tempCont}}"></treeItem>
</div>

Here's the complete tree element code:

<template>
    <div>
        <p v-on:click="openTree">{{title}}</p>
        <div id="childs" v-if="childVisibility">
            <treeItem v-for="item in content" :key="item" title=item>
        </div>
    </div>
</template>

<script>
export default {
    data: {
        childVisibility: false
    },

    methods: {
        openTree: function(){
            childVisibility = !childVisibility;
        }
    },

    props: {
        title: String,
        content: Array,
    }
}
</script>

<style scoped>

</style>

Error message received:

Answer №1

To implement, follow this example: :content="tempCont"

<div id="forest">
  <treeElement :title="Root" :content="tempCont"></treeElement>
</div>

Answer №2

First and foremost, when using v-bind with v-bind:title or :title, the binding should be in the form of a javascript expression.

If you want the title attribute to display the string Parent, you can either write it as a standard HTML attribute like title="Parent" (without the :), or as a vue bound attribute v-bind:title="'Parent'" or :title="'Parent'" (using '' to indicate a string primitive type in JavaScript).

The {{ variable }} syntax is typically used within Vue.js templates, but it is unnecessary to use it within v-bind attributes since they are already interpreted as JavaScript.

Therefore, instead of writing:

<div id="tree">
    <treeItem :title="Parent" :content="{{tempCont}}"></treeItem>
</div>

You should write:

<div id="tree">
    <treeItem title="Parent" :content="tempCont"></treeItem>
</div>

Because tempCont is already a valid JavaScript expression.

Answer №3

When it comes to passing attributes, using {{}} is not really necessary.

<treeItem :title="Parent" :content="tempCont"></treeItem>

This method should suffice for functionality. The purpose of {{}} is more for displaying data rather than passing attributes. Additionally, in your tree component, it's recommended to use object notations in the props. For example:

props: {
    title: {
        type: String
    },
    content: {
        type: Array
    },
}

Answer №4

It is important to ensure that your components are reactive by setting childVisibility to this instance instead of a direct reference. You can achieve this by defining it as follows:

export default {
data() {
    return {
        childVisibility: false
    }
},

methods: {
    openTree() {
        this.childVisibility = !this.childVisibility;
    }
},

props: {
    title: String,
    content: Array,
}

}

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