Day24 - Tab 頁籤 - iT 邦幫忙::一起幫忙解決難題，拯救 IT 人的一天

2024 iThome 鐵人賽

DAY 2

佛心分享-IT 人自學之術

深入探索PrimeVue 套件及元件寫法系列第 24 篇

Day24 - Tab 頁籤

16th鐵人賽 #primevue vue學習筆記

artemiskate20240101

2024-09-08 19:47:51

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Light tomorrow with today.
用現在點亮未來。

今天的任務要做一個 Tab component，
最主要作用為使用者可以在不同標籤間切換來查看不同的內容。

下面為示意圖:
step1. 先選一個

step2. click 按下向左 scroll

step3. 畫面經過 RWD Resize，自動跳到當初選 Tab

當Scroll 滑到底，箭頭到底顏色為淺灰色

基礎大頭貼tab

選擇 primevue tabMenu 為基準，做 tab component,

// template
  <p-tabMenu :model="items" @tab-change="onTabChange" ref="tabMenu">
        <template #item="{ item, props }">
          <a
            v-ripple
            v-bind="props.action"
            class="flex align-items-center gap-2"
          >
            <img
              :alt="item.name"
              :src="`https://primefaces.org/cdn/primevue/images/avatar/${item.image}`"
              style="width: 32px"
            />
            <span class="font-bold">{{ item.name }}</span>
          </a>
    </template>
</p-tabMenu>

// typescript
const items = ref([
  { name: "Amy Elsner", image: "amyelsner.png" },
  { name: "Anna Fali", image: "annafali.png" },
  { name: "Asiya Javayant", image: "asiyajavayant.png" },
  { name: "Bernardo Dominic", image: "bernardodominic.png" },
  { name: "Elwin Sharvill", image: "elwinsharvill.png" },
  { name: "Ioni Bowcher", image: "ionibowcher.png" },
  { name: "Ivan Magalhaes", image: "ivanmagalhaes.png" },
  { name: "Onyama Limba", image: "onyamalimba.png" },
  { name: "Stephen Shaw", image: "stephenshaw.png" },
  { name: "XuXue Feng", image: "xuxuefeng.png" },
]);

做左右箭頭

// template
 <p-button
        class="scroll-button left p-button-rounded p-button-text"
        @click="scroll('left')"
        :disabled="!showLeftScroll"
      >
        <i class="pi pi-chevron-left"></i>
</p-button>
<p-button
class="scroll-button right p-button-rounded p-button-text"
@click="scroll('right')"
:disabled="!showRightScroll"
>
<i class="pi pi-chevron-right"></i>
</p-button>

// typescript
const showLeftScroll = ref(false);
const showRightScroll = ref(false);

const scroll = (direction) => {
  if (tabMenu.value && tabMenu.value.$el) {
    const menuElement = tabMenu.value.$el.querySelector(".p-tabmenu-nav");
    const scrollAmount = 200;
    if (direction === "left") {
      menuElement.scrollLeft -= scrollAmount;
    } else {
      menuElement.scrollLeft += scrollAmount;
    }
    nextTick(checkScroll);
  }
};

如果在實施這些更改後仍然看不到箭頭，請檢查以下幾點：

確保 showLeftScroll 和 showRightScroll 在適當的時候被設置為 true。
確保 checkScroll 函數在適當的時機被調用，比如在窗口大小改變或內容變化時。
:disabled 屬性來控制按鈕的狀態。這樣按鈕始終可見，但在不需要滾動時會被禁用。
調整了 scroll 函數，使其直接操作 TabMenu 的內部元素，而不是外部容器。
修改了 checkScroll 函數，使其檢查 TabMenu 的內部滾動狀態。
在 style 部分：
為 .scroll-container 添加了 padding，為按鈕留出空間。
調整了 .p-tabmenu 和 .p-tabmenu-nav 的樣式，確保正確的滾動行為。
添加了按鈕的樣式，使其在各種狀態下都能正確顯示。
在 onMounted 鉤子中使用 nextTick，確保在 DOM 更新後再進行初始檢查。

樣式調整

一些深度選擇器 (:deep()) 來確保我們的樣式能夠覆蓋 PrimeVue 的默認樣式。

:deep(.p-tabmenu .p-tabmenu-nav .p-tabmenuitem.p-highlight .p-menuitem-link) 選擇器中的相應屬性。

scroll

scrollIntoView 選項中，這樣可以確保選中的 tab 總是居中顯示。

全部程式碼

<template>
  <div class="card">
    <div class="scroll-container" ref="scrollContainer">
      <p-tabMenu :model="items" @tab-change="onTabChange" ref="tabMenu">
        <template #item="{ item, props }">
          <a
            v-ripple
            v-bind="props.action"
            class="flex align-items-center gap-2"
          >
            <img
              :alt="item.name"
              :src="`https://primefaces.org/cdn/primevue/images/avatar/${item.image}`"
              style="width: 32px"
            />
            <span class="font-bold">{{ item.name }}</span>
          </a>
        </template>
      </p-tabMenu>
      <p-button
        class="scroll-button left p-button-rounded p-button-text"
        @click="scroll('left')"
        :disabled="!showLeftScroll"
      >
        <i class="pi pi-chevron-left"></i>
      </p-button>
      <p-button
        class="scroll-button right p-button-rounded p-button-text"
        @click="scroll('right')"
        :disabled="!showRightScroll"
      >
        <i class="pi pi-chevron-right"></i>
      </p-button>
    </div>
  </div>
</template>

<script setup>
import { ref, onMounted, nextTick, watchEffect } from "vue";

const items = ref([
  { name: "Amy Elsner", image: "amyelsner.png" },
  { name: "Anna Fali", image: "annafali.png" },
  { name: "Asiya Javayant", image: "asiyajavayant.png" },
  { name: "Bernardo Dominic", image: "bernardodominic.png" },
  { name: "Elwin Sharvill", image: "elwinsharvill.png" },
  { name: "Ioni Bowcher", image: "ionibowcher.png" },
  { name: "Ivan Magalhaes", image: "ivanmagalhaes.png" },
  { name: "Onyama Limba", image: "onyamalimba.png" },
  { name: "Stephen Shaw", image: "stephenshaw.png" },
  { name: "XuXue Feng", image: "xuxuefeng.png" },
]);

const scrollContainer = ref(null);
const tabMenu = ref(null);
const showLeftScroll = ref(false);
const showRightScroll = ref(false);

const checkScroll = () => {
  if (tabMenu.value && tabMenu.value.$el) {
    const menuElement = tabMenu.value.$el.querySelector(".p-tabmenu-nav");
    const { scrollLeft, scrollWidth, clientWidth } = menuElement;
    showLeftScroll.value = scrollLeft > 0;
    showRightScroll.value = scrollLeft < scrollWidth - clientWidth;
  }
};

const scroll = (direction) => {
  if (tabMenu.value && tabMenu.value.$el) {
    const menuElement = tabMenu.value.$el.querySelector(".p-tabmenu-nav");
    const scrollAmount = 200;
    if (direction === "left") {
      menuElement.scrollLeft -= scrollAmount;
    } else {
      menuElement.scrollLeft += scrollAmount;
    }
    nextTick(checkScroll);
  }
};

const onTabChange = (event) => {
  nextTick(() => {
    const tabElement = event.originalEvent.target.closest(".p-tabmenuitem");
    if (tabElement) {
      tabElement.scrollIntoView({
        block: "nearest",
      });
    }
    checkScroll();
  });
};

const onResize = () => {
  checkScroll();
  onTabChange({
    originalEvent: { target: tabMenu.value.$el.querySelector(".p-highlight") },
  });
};

watchEffect(() => {
  if (scrollContainer.value) {
    window.addEventListener("resize", onResize);
  }
});

onMounted(() => {
  nextTick(() => {
    checkScroll();
    window.addEventListener("resize", checkScroll);
  });
});
</script>

<style scoped>
.scroll-container {
  position: relative;
  overflow: hidden;
  padding: 0 40px; /* Make room for buttons */
}

.scroll-button {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
}

.scroll-button.left {
  left: 0;
}

.scroll-button.right {
  right: 0;
}

:deep(.p-tabmenu) {
  overflow-x: hidden;
}

:deep(.p-tabmenu-nav) {
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* Internet Explorer 10+ */
  scroll-behavior: smooth;
  padding-bottom: 1px; /* Add padding to show the bottom border */
}

:deep(.p-button.scroll-button) {
  color: #333 !important;
}

:deep(.p-highlight .p-menuitem-link) {
  border-color: #10b981;
}

/* 防止文字斷行 */
:deep(.p-tabmenu-nav .p-menuitem-link) {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

:deep(.p-tabmenu-nav .p-menuitem-link) span {
  margin-left: 10px;
}

:deep(.p-button:disabled) {
  color: #dfdada !important;
}
</style>

參考資料:
https://v3.primevue.org/tabview/