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前置文章

一、vue使用element-ui自定义样式思路分享【实操】
二、vue3&ts&el-tabs多个tab表单校验

现状确认

• 点击添加按钮，没有点击样式，用户感知不明显
• 没有限制最大的tab添加数量，可以无限添加
  

调整目标&代码编写

调整目标

• 点击添加按钮，按钮背景变成蓝色，加号图标变成白色
• 限制最大的tab添加数量为10，超过10添加按钮设置为灰色不可点击

代码编写

点击添加按钮，按钮背景变成蓝色

在vue使用element-ui自定义样式思路分享【实操】提到了如何给el-tabs按钮自定义样式，文本在按钮已经设置了自定义样式的基础上进行，首先实现点击按钮时，背景颜色变成蓝色，考虑使用伪类选择器active来实现。
蓝色保持与element框架默认提供的一致，可以通过Snipaste来拾取：F1开启截屏，鼠标移动到蓝色区域，Shift切换颜色数据类型，按C完整复制。

代码调整如下

/*添加按钮点击显示蓝色*/
.asset-tab :deep(.el-tabs__new-tab):active {background: #409eff;
}

效果

点击添加按钮，加号图标变成白色

观察svg的样式选择器，观察到通过fill设置颜色不生效，修改color颜色才生效，例如下图中设置为红色

添加代码

/*设置svg点击颜色显示白色*/
.asset-tab :deep(.el-tabs__new-tab):active .is-icon-plus svg {color: white;
}

效果

js动态禁止按钮点击&设置按钮禁止样式

添加禁止样式（主要关注前面三行)

/*禁止样式*/
.asset-tab :deep(.el-tabs__new-tab.disabled) {pointer-events: none;opacity: 0.8;background: lightgray;height: 30px;width: 30px;border-radius: 15px;font-size: 16px;
}

操作document动态添加或去除禁止样式，注意document.querySelector()选择器不需要加:deep()，并将修改逻辑抽取成方法setAddBtnStatus，在增减tab逻辑后调用即可

const setAddBtnStatus = function () {const newTab = document.querySelector('.asset-tab .el-tabs__new-tab')console.log('newTab', newTab)const index = tabs.value.lengthif (index >= 10) {newTab?.classList.add('disabled')} else {newTab?.classList.remove('disabled')}
}

最终效果&完整代码

完整代码：

<!--AssetCreate.vue-->
<template><div style="margin-bottom: 10px"><h3>数据源选择：</h3><el-switch v-model="isUseLocalFlag" active-text="使用本地服务数据" inactive-text="使用mock数据"/><el-button @click="setTabData" style="margin-left: 10px;">给tab赋值</el-button><el-button @click="clearTabData" >清空tab赋值</el-button></div><div class="asset-tab"><el-tabs v-model="activeTab" type="card" editable class="demo-tabs" @edit="handleTabsEdit"><el-tab-pane v-for="tab in tabs" :key="tab.name" :label="tab.label" :name="tab.name"><AssetItem ref="assetItemRefs" :insertForm="tab.insertForm"/></el-tab-pane></el-tabs></div><div class="bottom-btn"><el-button @click="submitAsset" type="primary">提交</el-button></div>
</template><script setup lang="ts">
import { ref } from 'vue'
import axios from 'axios'
import type { TabPaneName } from 'element-plus'
import { removeRedundantFields } from '@/utils/methodUtil'
import AssetItem from '@/components/asset/AssetItem.vue'
import type { AssetFormData } from '@/types'
import { ElMessage } from 'element-plus'
// 当前激活的tab
const activeTab = ref('表单 1')
// tabs初始数据
const tabs = ref([{ label: '表单 1', name: '表单 1', insertForm: {} }
])
const isUseLocalFlag = ref(true)
const clearTabData = function () {tabs.value = [{ label: '表单 1', name: '表单 1', insertForm: {} }]activeTab.value = '表单 1'setAddBtnStatus()
}
const setTabData = async function () {const bizId = '0777c40218114c35a29b0d4d84355668'if (isUseLocalFlag.value) {await axios.post(`/asset/assetInfo/${bizId}/byBizId`).then(result => {if (result.status === 200) {tabs.value = []const assetInfoList = result?.data?.data?.assetInfoListconst removeResult = removeRedundantFields(assetInfoList, ['extAttribute11', 'extAttribute12','extAttribute13', 'extAttribute14', 'extAttribute15', 'extAttribute16', 'extAttribute17', 'extAttribute18','extAttribute19', 'extAttribute20'])removeResult.forEach((item, index) => {const newTabName = `表单 ${index + 1}`tabs.value.push({label: newTabName,name: newTabName,insertForm: item})setAddBtnStatus()activeTab.value = newTabName})}})} else {// 请求mock数据await axios.post('/mock/asset/assetInfo', { bizId }).then(result => {const assetInfoList: Array<AssetFormData> = result?.data?.data?.assetInfoListtabs.value = []assetInfoList.forEach((asset, idx) => {const newTabName = `表单 ${idx + 1}`tabs.value.push({label: newTabName,name: newTabName,insertForm: asset})setAddBtnStatus()activeTab.value = newTabName})})}
}
const assetItemRefs = ref<InstanceType<typeof AssetItem>[]>([])
const handleTabsEdit = (targetName: TabPaneName | undefined,action: 'remove' | 'add'
) => {if (action === 'add') {let index = tabs.value.lengthif (index >= 10) returnconst newTabName = `表单 ${++index}`tabs.value.push({label: newTabName,name: newTabName,insertForm: {}})activeTab.value = newTabName} else if (action === 'remove') {const activeName = activeTab.valueif (tabs.value.length === 1) returntabs.value = tabs.value.filter((tab) => tab.name !== targetName)tabs.value.forEach((item, index) => {item.name = `表单 ${++index}`item.label = item.name})const currentExist = tabs.value.some((item, index) => {if (item.name === activeName) {return index}return false})if (!currentExist) activeTab.value = tabs.value[tabs.value.length - 1].name}setAddBtnStatus()
}
const setAddBtnStatus = function () {const newTab = document.querySelector('.asset-tab .el-tabs__new-tab')const index = tabs.value.lengthif (index >= 10) {newTab?.classList.add('disabled')} else {newTab?.classList.remove('disabled')}
}
const verifyPass = ref(true)
const submitAsset = async function () {for (const index in assetItemRefs.value) {const verifyResult = await assetItemRefs.value[index].submitForm()// 定位到第一个校验失败的tabif (!verifyResult) {verifyPass.value = falseactiveTab.value = `表单 ${Number(index) + 1}`break} else {verifyPass.value = true}}if (verifyPass.value) ElMessage({ message: '表单校验通过', type: 'success' })
}
</script><style scoped>
/*禁止样式*/
.asset-tab :deep(.el-tabs__new-tab.disabled) {pointer-events: none;opacity: 0.8;background: lightgray;height: 30px;width: 30px;border-radius: 15px;font-size: 16px;
}
.asset-tab :deep(.el-tabs__new-tab) {height: 30px;width: 30px;border-radius: 15px;font-size: 16px;
}/*添加按钮点击显示蓝色*/
.asset-tab :deep(.el-tabs__new-tab):active {background: #409eff;
}
/*设置svg点击颜色显示白色*/
.asset-tab :deep(.el-tabs__new-tab):active .is-icon-plus svg {color: white;
}
.bottom-btn {text-align: center;margin-bottom: 10px;
}
</style>

代码仓：hello_vue3