[improvement] Pagination: jsx (#2560)

packages/pagination/index.js

@@ -0,0 +1,141 @@
+import { use } from '../utils';
+
+const [sfc, bem, t] = use('pagination');
+
+function makePage(number, text, active) {
+  return { number, text, active };
+}
+
+export default sfc({
+  props: {
+    value: Number,
+    prevText: String,
+    nextText: String,
+    pageCount: Number,
+    totalItems: Number,
+    forceEllipses: Boolean,
+    mode: {
+      type: String,
+      default: 'multi'
+    },
+    itemsPerPage: {
+      type: Number,
+      default: 10
+    },
+    showPageSize: {
+      type: Number,
+      default: 5
+    }
+  },
+
+  computed: {
+    count() {
+      const count = this.pageCount || Math.ceil(this.totalItems / this.itemsPerPage);
+      return Math.max(1, count);
+    },
+
+    pages() {
+      const pages = [];
+      const pageCount = this.count;
+
+      if (this.mode !== 'multi') {
+        return pages;
+      }
+
+      // Default page limits
+      let startPage = 1;
+      let endPage = pageCount;
+      const isMaxSized = this.showPageSize !== undefined && this.showPageSize < pageCount;
+
+      // recompute if showPageSize
+      if (isMaxSized) {
+        // Current page is displayed in the middle of the visible ones
+        startPage = Math.max(this.value - Math.floor(this.showPageSize / 2), 1);
+        endPage = startPage + this.showPageSize - 1;
+
+        // Adjust if limit is exceeded
+        if (endPage > pageCount) {
+          endPage = pageCount;
+          startPage = endPage - this.showPageSize + 1;
+        }
+      }
+
+      // Add page number links
+      for (let number = startPage; number <= endPage; number++) {
+        const page = makePage(number, number, number === this.value);
+        pages.push(page);
+      }
+
+      // Add links to move between page sets
+      if (isMaxSized && this.showPageSize > 0 && this.forceEllipses) {
+        if (startPage > 1) {
+          const previousPageSet = makePage(startPage - 1, '...', false);
+          pages.unshift(previousPageSet);
+        }
+
+        if (endPage < pageCount) {
+          const nextPageSet = makePage(endPage + 1, '...', false);
+          pages.push(nextPageSet);
+        }
+      }
+
+      return pages;
+    }
+  },
+
+  watch: {
+    value: {
+      handler(page) {
+        this.select(page || this.value);
+      },
+      immediate: true
+    }
+  },
+
+  methods: {
+    select(page) {
+      page = Math.min(this.count, Math.max(1, page));
+      if (this.value !== page) {
+        this.$emit('input', page);
+        this.$emit('change', page);
+      }
+    }
+  },
+
+  render(h) {
+    const { value } = this;
+    const simple = this.mode !== 'multi';
+
+    const onSelect = value => () => {
+      this.select(value);
+    };
+
+    return (
+      <ul class={bem({ simple })}>
+        <li
+          class={[bem('item', { disabled: value === 1 }), bem('prev'), 'van-hairline']}
+          onClick={onSelect(value - 1)}
+        >
+          {this.prevText || t('prev')}
+        </li>
+        {this.pages.map(page => (
+          <li
+            class={[bem('item', { active: page.active }), bem('page'), 'van-hairline']}
+            onClick={onSelect(page.number)}
+          >
+            {page.text}
+          </li>
+        ))}
+        {simple && (
+          <li class={bem('page-desc')}>{this.$slots.pageDesc || `${value}/${this.count}`}</li>
+        )}
+        <li
+          class={[bem('item', { disabled: value === this.count }), bem('next'), 'van-hairline']}
+          onClick={onSelect(value + 1)}
+        >
+          {this.nextText || t('next')}
+        </li>
+      </ul>
+    );
+  }
+});