分享一个 Vue3 应用:教您实现点击按钮实现文字变色功能。废话不多说,直接上干货啦。
1.动态样式实现
1.1核心代码解释:
class="power-station-perspective-item-text"
:为这个
span
元素添加了一个 CSS 类,以便对其样式进行定义。@click="clickItem(item.id)"
:这是一个 Vue 事件绑定。当用户点击这个
span
元素时,会触发clickItem
方法,并将item.id
作为参数传递给该方法。这用于记录用户点击了哪个项目。:style="{ color: isChecked(item.id) ? '#cc7e17' : '' }"
:这是一个 Vue 动态绑定的内联样式。
isChecked(item.id)
会检查当前项目是否被选中(即checkedItem.value
是否等于item.id
)。如果
isChecked(item.id)
返回true
,则color
样式会被设置为'#cc7e17'
(一种颜色值);否则,color
样式为空字符串,表示不改变颜色。{{ item.title }}
:这是一个 Vue 插值语法,用于显示每个项目的标题文本。
<span class="power-station-perspective-item-text" @click="clickItem(item.id)" :style="{ color: isChecked(item.id) ? '#cc7e17' : '' }"> {{ item.title }} </span>
1.2源代码
<template> <div class="power-station-perspective"> <div class="flow-chart-container-item"> <div class="power-station-perspective-title flow-chart-container-item-parent"> {{ title }} </div> <div v-for="item in buttonGroupsArr" :key="item.id" class="power-station-perspective-item flow-chart-container-item location" > <span class="power-station-perspective-item-text" @click="clickItem(item.id)" :style="{ color: isChecked(item.id) ? '#cc7e17' : '' }"> {{ item.title }} </span> </div> </div> </div> </template> <script setup> import {ref, onMounted} from "vue"; const title = ref("菜单项"); const buttonGroupsArr = ref([ {title: "按钮1", id: 0}, {title: "按钮2", id: 1}, {title: "按钮3", id: 2}, {title: "按钮4", id: 3}, {title: "按钮5", id: 4}, ]); const checkedItem = ref(0); const isChecked = (param) => { return checkedItem.value === param; }; const clickItem = (param) => { checkedItem.value = param; }; onMounted(() => { }); </script> <style scoped> .power-station-perspective{ width: 200px; } .flow-chart-container-item-parent { width: 100%; background: linear-gradient(90deg, rgba(0, 136, 234, 0.84) 0%,rgba(31, 38, 83, 0.85) 101.82%); } .flow-chart-container-item { display: grid; text-align: center; padding: 3px 5px 3px 3px; margin-bottom: 3px; align-items: center; } .power-station-perspective-item { background: rgba(0, 46, 79, 0.5); } .location { cursor: pointer; } .power-station-perspective-item-text { margin: 0 auto; cursor: pointer; } .power-station-perspective-title { margin-bottom: 3px; } </style>
2.动态类名
2.1核心代码解释
说明:
:class
绑定::class
是 Vue 提供的一个特性,用于绑定动态类名。在这里,
:class
绑定了一个数组,其中包含了两个元素。数组语法:
{ 'active-power-station-perspective-item-text': isChecked(item.id) }
这个对象的键是
'active-power-station-perspective-item-text'
,值是一个布尔表达式isChecked(item.id)
。如果
isChecked(item.id)
返回true
,则active-power-station-perspective-item-text
类会被应用到span
元素上;否则,不会应用。这意味着每个
span
元素都会始终应用这个基础类,确保基本样式统一。数组的第一个元素是
'power-station-perspective-item-text'
:数组的第二个元素是一个对象:
:class="['power-station-perspective-item-text', { 'active-power-station-perspective-item-text': isChecked(item.id) } ]">
2.2源代码
<template> <div class="power-station-perspective"> <div class="flow-chart-container-item"> <div class="power-station-perspective-title flow-chart-container-item-parent"> {{ title }} </div> <div v-for="item in buttonGroupsArr" :key="item.id" class="power-station-perspective-item flow-chart-container-item location" > <span class="power-station-perspective-item-text" @click="clickItem(item.id)" :class="[ 'power-station-perspective-item-text', { 'active-power-station-perspective-item-text': isChecked(item.id) } ]"> {{ item.title }} </span> </div> </div> </div> </template> <script setup> import {ref, onMounted} from "vue"; const title = ref("菜单项"); const buttonGroupsArr = ref([ {title: "按钮1", id: 0}, {title: "按钮2", id: 1}, {title: "按钮3", id: 2}, {title: "按钮4", id: 3}, {title: "按钮5", id: 4}, ]); const checkedItem = ref(0); const isChecked = (param) => { return checkedItem.value === param; }; const clickItem = (param) => { checkedItem.value = param; }; onMounted(() => { }); </script> <style scoped> .power-station-perspective{ width: 200px; } .flow-chart-container-item-parent { width: 100%; background: linear-gradient(90deg, rgba(0, 136, 234, 0.84) 0%,rgba(31, 38, 83, 0.85) 101.82%); } .flow-chart-container-item { display: grid; text-align: center; padding: 3px 5px 3px 3px; margin-bottom: 3px; align-items: center; } .power-station-perspective-item { background: rgba(0, 46, 79, 0.5); } .location { cursor: pointer; } .power-station-perspective-item-text { margin: 0 auto; cursor: pointer; } .active-power-station-perspective-item-text{ color: #cc7e17; } .power-station-perspective-title { margin-bottom: 3px; } </style>
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