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Vue.js 3.0 Style Guide

Vue 3.0 Style Guide

Vue 3.0 Class and Style binding

In Vue.js, it is easy to bind classes and styles to HTML elements. This allows you to dynamically change the appearance of your components based on the component's data.

Let's explore the use of both v-bind:style and v-bind:class in Vue.js 3.0.

1. Class Binding

You can bind classes to an HTML element with the v-bind:class directive. Here's an example where the button's class changes depending on the value of isActive:

<template>
  <div>
    <button v-bind:class="{ active: isActive }">Button</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      isActive: true,
    };
  },
}
</script>

<style scoped>
.active {
  color: white;
  background-color: blue;
}
</style>

In the above example, the active class will be applied to the button when isActive is true, and removed when isActive is false.

2. Style Binding

You can bind inline styles to an HTML element with the v-bind:style directive. Here's an example:

<template>
  <div>
    <button v-bind:style="{ color: textColor, backgroundColor: backgroundColor }">
      Button
    </button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      textColor: 'white',
      backgroundColor: 'blue',
    };
  },
}
</script>

In the above example, the color and backgroundColor styles of the button will be bound to textColor and backgroundColor, respectively. This means that when you change the value of textColor or backgroundColor in your component's data, the appearance of the button will change accordingly.

3. Array Syntax

When you need to apply multiple classes or a mix of static and dynamic classes, you can use array syntax:

<template>
  <div>
    <button v-bind:class="['btn', { 'btn-active': isActive }]">
      Button
    </button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      isActive: true,
    };
  },
}
</script>

<style scoped>
.btn {
  padding: 10px;
  border: none;
  cursor: pointer;
}

.btn-active {
  color: white;
  background-color: blue;
}
</style>

In the above example, the btn class is always applied, and the btn-active class is applied only when isActive is true.

With class and style binding in Vue.js, you have a powerful way to make your components dynamic and responsive to changes in your component's data.

Vue 3.0 Dynamic Class and Style Binding:

Dynamically bind classes and styles in Vue 3.0 based on data.

<!-- DynamicClassStyleBinding.vue -->
<template>
  <div :class="{ active: isActive }" :style="{ color: textColor }">
    Dynamic Class and Style Binding
  </div>
</template>

<script>
import { ref } from 'vue';

export default {
  setup() {
    const isActive = ref(true);
    const textColor = ref('blue');

    return {
      isActive,
      textColor,
    };
  },
};
</script>

Vue 3.0 Conditional Class Binding:

Conditionally apply classes based on a condition in Vue 3.0.

<!-- ConditionalClassBinding.vue -->
<template>
  <div :class="{ active: isActive, 'text-danger': isError }">
    Conditional Class Binding
  </div>
</template>

<script>
import { ref } from 'vue';

export default {
  setup() {
    const isActive = ref(true);
    const isError = ref(false);

    return {
      isActive,
      isError,
    };
  },
};
</script>

Vue 3.0 Style Binding in Components:

Bind styles dynamically in Vue 3.0 component.

<!-- StyleBindingInComponents.vue -->
<template>
  <custom-component :style="{ fontSize: '16px', fontWeight: 'bold' }">
    Style Binding in Components
  </custom-component>
</template>

<script>
import CustomComponent from './CustomComponent.vue';

export default {
  components: {
    CustomComponent,
  },
};
</script>

<!-- CustomComponent.vue -->
<template>
  <div>
    <slot></slot>
  </div>
</template>

<script>
export default {};
</script>

<style scoped>
/* Styles specific to the component */
</style>

Vue 3.0 Class and Style Binding Examples:

Combine class and style bindings in Vue 3.0.

<!-- ClassStyleBindingExamples.vue -->
<template>
  <div :class="{ active: isActive }" :style="{ color: textColor, fontSize: '16px' }">
    Class and Style Binding Examples
  </div>
</template>

<script>
import { ref } from 'vue';

export default {
  setup() {
    const isActive = ref(true);
    const textColor = ref('blue');

    return {
      isActive,
      textColor,
    };
  },
};
</script>

Vue 3.0 Class Binding with Computed Properties:

Use computed properties for complex class binding logic in Vue 3.0.

<!-- ClassBindingComputed.vue -->
<template>
  <div :class="computedClasses">
    Class Binding with Computed Properties
  </div>
</template>

<script>
import { ref, computed } from 'vue';

export default {
  setup() {
    const isActive = ref(true);
    const isError = ref(false);

    const computedClasses = computed(() => {
      return {
        active: isActive.value,
        'text-danger': isError.value,
      };
    });

    return {
      computedClasses,
    };
  },
};
</script>

Vue 3.0 Dynamic Style Binding using v-bind:

Dynamically bind styles using v-bind in Vue 3.0.

<!-- DynamicStyleBinding.vue -->
<template>
  <div v-bind:style="dynamicStyles">
    Dynamic Style Binding using v-bind
  </div>
</template>

<script>
import { ref } from 'vue';

export default {
  setup() {
    const dynamicStyles = ref({
      color: 'blue',
      fontSize: '16px',
    });

    return {
      dynamicStyles,
    };
  },
};
</script>

Vue 3.0 Binding Classes Conditionally:

Conditionally bind classes based on a dynamic condition in Vue 3.0.

<!-- BindingClassesConditionally.vue -->
<template>
  <div :class="{ active: isActive, 'text-danger': isError }">
    Binding Classes Conditionally
  </div>
</template>

<script>
import { ref } from 'vue';

export default {
  setup() {
    const isActive = ref(true);
    const isError = ref(false);

    return {
      isActive,
      isError,
    };
  },
};
</script>