Using VueJS for Dynamic Class Binding

Using Vue version 3.0.5.

I have a component named Cube.vue where I am attempting to dynamically assign a blue or green class to a child element.

The component has been created and imported into a specific page, however, I am facing issues getting the conditional class assignment to work as intended.

<template>
  <div :class="$style.cubeInner">
    <div class="cube" :class="{ 'cube--blue': isBlue, 'cube--green': isGreen }">
      <div v-for="side in cubeside" :class="side.class" :key="side.id"></div>
    </div>
  </figure>
</template>

This is my export:

export default {
  data() {
    return {
      Cube: 'cube',
      isBlue: Boolean,
      isGreen: Boolean,
    };
  }
};

I import this component into another one and render it using

<cube-hover></cube-hover>
. I am unsure whether I need to set a prop or utilize the data() method to determine whether isBlue should be true or false. I am encountering difficulties targeting the nested <div> element as the class is being added to the parent only. My goal is to add either the class 'cube--blue' or 'cube--green' to specific pages.

Answer №1

Store the boolean value in a data field, and then place the condition check within a computed function.

...enhanced with additional details

export default {
    data: () => {
        ...
        isBlue: Boolean,
        isGreen: Boolean,
    },
    computed: 
        isBlue() {
            if (is it blue?) return true;
            return false;
        },
        isGreen() {
            if (is it green?) return true;
            return false;
        }
}

<template>
    ...
    <div class="cube" :class="{ isBlue ? 'cube--blue' : 'cube--green': isGreen }">
    <!-- I believe there may be a mistake here: "'cube--blue': isBlue ? 'cube--green': isGreen" as per note -->
</template>

note

You are using a "?" to separate your classes when it should be a comma, or you may intend to use a ternary operation. Comma separation could potentially apply both classes simultaneously, which might not be desired. If you are aiming for conditional class assignment:

Correct your ternary syntax:

`condition ? value if true : value if false`

make sure to include the : value if false segment

What you probably want is:

`:class="isBlue ? 'cube--blue' : 'cube--green'"

Lastly

After explaining this, I am inclined to suggest a different approach. Assuming the cube can only be either green OR blue, but not both simultaneously, consider consolidating the logic into one step. You could use a conditional inside a getColor function for this purpose. This approach is particularly efficient if you expect more than two colors in the future. The function would then return a color, which can be inserted into your class name like this:

<div :class="`cube--${color}`"></i>

Answer №2

I'm having trouble understanding your question about 'or'.

Based on your data, simply input:

<div class="cube" :class="{ 'cube--blue': isBlue, 'cube--green': isGreen }">

Update: Kraken suggested a different approach:

<div class="cube" :class="`cube--${getColor}`">

and in your data, include:

data() {
  return {
    color: 'blue',
  };
},
computed: {
  getColor() {
    return this.color;
  },
},

This method allows for easy adaptation to potential new colors in the future by simply updating this.color.

Answer №3

<ul
   v-for="element in elements"
   :key="element.id"
   class="list-item"
   :class="{ nested: hasSubElements(element.subElements) }"
 >
   
 methods: {
    hasSubElements(element) {
      return element.length > 0 ? true : false;
    },
 }

Answer №4

In my opinion, this is the most effective solution to address this issue.

<div class="checkbox-wrapper">
  <div :class="[isInsurancePictureRequired === 'yes' ? 'custom-checkbox-active' : '', 'custom-checkbox']">
      <label class="pic-required-checkbox-label" for="yes">
     <input type="radio" id="yes" name="picture-require" value="yes" @click="handleCheckBox" checked>
    <span class="checkmark"gt;</span>
     Yes
  </label>
</div>

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