How to use color variables in vue inline style

In Vue, we can use inline styles to style elements, but sometimes we need to use color variables to define colors instead of hard-coding color values. In this article, we will introduce how to use color variables as the value of inline styles in Vue.

1. Use Vue’s computed properties

Vue’s computed properties are a very powerful function. It can calculate new properties based on changes in data, thereby achieving dynamic changes. We can use a computed property to define a color variable and then use the value of this computed property in the element's inline style.

<template>
  <div :style="{ backgroundColor: bgColor }">Hello World!</div>
</template>

<script>
export default {
  data() {
    return {
      color: "#fff",
    };
  },
  computed: {
    bgColor() {
      return this.color;
    },
  },
};
</script>

In this example, we define a calculated attribute bgColor, which returns the color data we defined. This attribute is our color variable. In the inline style of the element, we use the bgColor attribute to define the background color, so that when the color data is changed, the background color will change accordingly.

2. Define color variables in Vue components

In the development of Vue, we usually use components to split the page to make the page clearer and maintainable. If we want to use a color variable within a component, we can define a variable in the component and pass it to the inner element as the value of the style attribute.

<template>
  <div :style="{ backgroundColor: bgColor }">Hello World!</div>
</template>

<script>
export default {
  data() {
    return {
      color: "#fff",
    };
  },
  computed: {
    bgColor() {
      return this.color;
    },
  },
};
</script>

In this example, we define a variable color and then use the bgColor() computed property in the inline style so that the component can be used Internal color variable.

3. Using CSS variables in Vue

In addition to using calculated properties or variables, we can also use CSS variables in Vue. CSS variables can be defined in style sheets and used in inline styles to achieve global and local style definitions. Using CSS variables in Vue is very simple, just define the variable name in the stylesheet and then use the var() function in the inline style.

<template>
  <div :style="{ backgroundColor: `var(--color-primary)` }">Hello World!</div>
</template>

<style>
:root {
  --color-primary: #409EFF;
}
</style>

In this example, we define a root-level CSS variable --color-primary in the style sheet, and its value is blue. In the inline style of the element, we use the var() function and pass the variable name as a parameter to implement the use of color variables.

Summary:

Using color variables as the value of inline styles in Vue can help us implement global and local style definitions and improve the maintainability and readability of the code. We can use calculated properties, variables or CSS variables to define and use color variables. Just choose the most appropriate method according to the actual situation.

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