#105 UIPagination: add component (#111)

* feat(pagination): completed pagination component

* chore: updated version

* chore(dev-deps): updated dependencies

- @types/requestidlecallback
- @typescript-eslint/eslint-plugin
- @typescript-eslint/parser
- @vitejs/plugin-vue
- autoprefixer
- lint-staged
- sass
- ts-node
- vite

* test(pagination): added tests

* style: spacing

Add spacing between methods

* test(pagination): updated snapshots

* chore: added todo

* style(pagination): added no selecting to the `...` characters

* style(pagination): set min-width for page buttons

Author: nandi95

.commitlintrc.js

@@ -31,6 +31,7 @@ module.exports = {
                 'table',
                 'textarea',
                 'toggle',
+                'pagination',
                 'transitions',
                 'tooltip',
                 'outer-html',

package-lock.json

@@ -1,6 +1,6 @@
 {
     "name": "@karnama/vueish",
-    "version": "0.5.0",
+    "version": "0.6.0",
     "files": [
         "dist",
         "types"

package.json

@@ -12,6 +12,7 @@ describe('UIInput', () => {
 
         expect(wrapper.element).toMatchSnapshot();
     });
+
     it('should handle model-binding correctly', async () => {
         const wrapper = mount(UIInput, {
             props: {

src/components/input/UIInput.test.ts

@@ -0,0 +1,53 @@
+<template>
+    <div class="mb-6 flex flex-col text-color">
+        <UICheckbox v-model="disabled"
+                    name="disabled"
+                    label="Disabled"
+                    class="mb-2" />
+        <label>
+            Page count ({{ length }})
+            <input v-model="length"
+                   type="range"
+                   min="1"
+                   max="100"
+                   name="page-count">
+        </label>
+
+        <label>
+            Visible Buttons ({{ visible }})
+            <input v-model="visible"
+                   type="range"
+                   min="1"
+                   :max="length"
+                   step="2"
+                   name="visible-buttons">
+        </label>
+    </div>
+
+    <UIPagination v-model="page"
+                  :length="length"
+                  :disabled="disabled"
+                  :visible-count="visible" />
+</template>
+
+<script lang="ts">
+import { defineComponent, ref } from 'vue';
+
+export default defineComponent({
+    name: 'Pagination',
+
+    setup() {
+        const disabled = ref(false);
+        const page = ref(5);
+        const length = ref(10);
+        const visible = ref(3);
+
+        return {
+            disabled,
+            page,
+            length,
+            visible
+        };
+    }
+});
+</script>

src/components/pagination/Demo.vue

@@ -0,0 +1,121 @@
+import { mount } from '@vue/test-utils';
+import UIPagination from './UIPagination.vue';
+import { ref } from 'vue';
+
+const commonProps = {
+    modelValue: 5,
+    length: 10,
+    visibleCount: 3
+} as const;
+
+describe('UIPagination', () => {
+    it('should render correctly', () => {
+        const wrapper = mount(UIPagination, {
+            props: commonProps
+        });
+
+        expect(wrapper.element).toMatchSnapshot();
+    });
+
+    it('should display the correct number of buttons', async () => {
+        const wrapper = mount(UIPagination, {
+            props: commonProps
+        });
+
+        expect(wrapper.findAll('button')).toHaveLength(
+            // previous and next buttons
+            2
+            // the buttons
+            + commonProps.visibleCount
+            // the wrapping end buttons
+            + 2
+        );
+
+        await wrapper.setProps({ visibleCount: 5 });
+        expect(wrapper.findAll('button')).toHaveLength(
+            // previous and next buttons
+            2
+            // the buttons
+            + 5
+            // the wrapping end buttons
+            + 2
+        );
+    });
+
+    it('should navigate to the previous page on previous button', async () => {
+        const wrapper = mount(UIPagination, {
+            props: commonProps
+        });
+
+        const previousPageBtn = wrapper.find('#previous-page-button');
+        await previousPageBtn.trigger('click');
+
+        expect(wrapper.lastEventValue()).toStrictEqual([4]);
+        await previousPageBtn.trigger('click');
+        await previousPageBtn.trigger('click');
+        await previousPageBtn.trigger('click');
+        expect(wrapper.lastEventValue()).toStrictEqual([1]);
+
+        await previousPageBtn.trigger('click');
+        // it is now disabled so:
+        expect(wrapper.lastEventValue()).toStrictEqual([1]);
+        expect(wrapper.emitted('update:modelValue')).toHaveLength(4);
+    });
+
+    it('should navigate to the next page on next button', async () => {
+        const wrapper = mount(UIPagination, {
+            props: commonProps
+        });
+
+        const nextPageBtn = wrapper.find('#next-page-button');
+        await nextPageBtn.trigger('click');
+
+        expect(wrapper.lastEventValue()).toStrictEqual([6]);
+        await nextPageBtn.trigger('click');
+        await nextPageBtn.trigger('click');
+        await nextPageBtn.trigger('click');
+        await nextPageBtn.trigger('click');
+        expect(wrapper.lastEventValue()).toStrictEqual([10]);
+
+        await nextPageBtn.trigger('click');
+        // it is now disabled so:
+        expect(wrapper.lastEventValue()).toStrictEqual([10]);
+        expect(wrapper.emitted('update:modelValue')).toHaveLength(5);
+    });
+
+    it('should handle model-binding correctly', async () => {
+        const wrapper = mount({
+            components: { UIPagination },
+            template: '<UIPagination v-model="value" length="10" visible-count="3" />' +
+                '<div id="decrement" @click="value--" />',
+            setup: () => {
+                return {
+                    value: ref(5)
+                };
+            }
+        });
+
+        expect(wrapper.find('#page-5-button').attributes()['title']).toBe('Current Page, Page 5');
+        await wrapper.find('#next-page-button').trigger('click');
+        expect(wrapper.find('#page-5-button').attributes()['title']).toBe('Go to page 5');
+        expect(wrapper.find('#page-6-button').attributes()['title']).toBe('Current Page, Page 6');
+        await wrapper.find('#decrement').trigger('click');
+        expect(wrapper.find('#page-5-button').attributes()['title']).toBe('Current Page, Page 5');
+        expect(wrapper.find('#page-6-button').attributes()['title']).toBe('Go to page 6');
+    });
+
+    it('should disable buttons if prop given', () => {
+        const wrapper = mount(UIPagination, {
+            props: { ...commonProps, disabled: true }
+        });
+
+        expect(wrapper.findAll('button[disabled]')).toHaveLength(
+            // previous and next buttons
+            2
+            // the buttons
+            + commonProps.visibleCount
+            // the wrapping end buttons
+            + 2
+        );
+    });
+});

src/components/pagination/UIPagination.test.ts

@@ -0,0 +1,174 @@
+<template>
+    <div :key="page"
+         class="flex flex-wrap justify-between items-center max-w-max space-x-2"
+         role="navigation"
+         aria-label="Pagination navigation">
+        <UIButton id="previous-page-button"
+                  :disabled="disabled || !hasPrevious"
+                  aria-label="Previous Page"
+                  class="transform rotate-90 !p-1"
+                  @click="page === 1 ? undefined : setPage(page - 1)"
+                  v-html="chevronIcon" />
+        <UIButton id="page-1-button"
+                  :aria-current="isCurrent = page === 1"
+                  :category="isCurrent ? 'primary' : 'default'"
+                  :disabled="disabled"
+                  :outline="!isCurrent"
+                  class="page-button"
+                  :aria-label="isCurrent ? 'Current Page, Page 1' : 'Go to page 1'"
+                  :title="isCurrent ? 'Current Page, Page 1' : 'Go to page 1'"
+                  @click="setPage(1)">
+            1
+        </UIButton>
+        <div v-if="pages[0] !== 2" class="select-none">
+            ...
+        </div>
+        <UIButton v-for="pageNum in pages"
+                  :id="`page-${pageNum}-button`"
+                  :key="pageNum"
+                  :aria-current="isCurrent = pageNum === page"
+                  :category="isCurrent ? 'primary' : 'default'"
+                  :outline="!isCurrent"
+                  class="page-button"
+                  :aria-label="isCurrent ? 'Current Page, Page ' + pageNum : 'Go to page ' + pageNum"
+                  :title="isCurrent ? 'Current Page, Page ' + pageNum : 'Go to page ' + pageNum"
+                  :disabled="disabled"
+                  @click="setPage(pageNum)">
+            {{ pageNum }}
+        </UIButton>
+        <div v-if="startPagesFrom + Number(visibleCount) < Number(length)" class="select-none">
+            ...
+        </div>
+        <UIButton v-if="Number(length) > 1"
+                  :id="`page-${length}-button`"
+                  :aria-current="isCurrent = page === Number(length)"
+                  :category="isCurrent ? 'primary' : 'default'"
+                  :disabled="disabled"
+                  class="page-button"
+                  :outline="!isCurrent"
+                  :aria-label="isCurrent ? 'Current Page, Page ' + length : 'Go to page ' + length"
+                  :title="isCurrent ? 'Current Page, Page ' + length : 'Go to page ' + length"
+                  @click="setPage(Number(length))">
+            {{ length }}
+        </UIButton>
+        <UIButton id="next-page-button"
+                  :disabled="disabled || !hasNext"
+                  aria-label="Next Page"
+                  class="transform rotate-270 !p-1"
+                  @click="page === Number(length) ? undefined : setPage(page + 1)"
+                  v-html="chevronIcon" />
+    </div>
+</template>
+
+<script lang="ts">
+import { computed, defineComponent } from 'vue';
+import { useVModel, disabled } from '@composables/input';
+import { getIcon } from '@/helpers';
+import UIButton from '@components/button/UIButton.vue';
+
+export default defineComponent({
+    name: 'UIPagination',
+
+    components: { UIButton },
+
+    props: {
+        /**
+         * The current page.
+         */
+        modelValue: {
+            type: Number,
+            default: 1,
+            validator: (val: number) => Number.isInteger(val) && val >= 0
+        },
+
+        /**
+         * The number of pages.
+         */
+        length: {
+            type: [Number, String],
+            required: true,
+            validator: (val: number | string) => {
+                val = Number(val);
+                return !isNaN(val) && Number.isInteger(val) && val > 0;
+            }
+        },
+
+        /**
+         * The total number of page buttons to show.
+         */
+        visibleCount: {
+            type: [Number, String],
+            default: 3,
+            validator: (val: number | string) => {
+                val = Number(val);
+                const isValid = !isNaN(val) && Number.isInteger(val) && val >= 0;
+
+                if (isValid && val % 2 !== 1) {
+                    throw new Error('visibleCount expected to be an odd number.');
+                }
+
+                return isValid;
+            }
+        },
+
+        disabled
+    },
+
+    emits: ['update:modelValue'],
+
+    setup(props) {
+        const chevronIcon = getIcon('chevron');
+
+        const page = useVModel<number>(props);
+        const hasPrevious = computed(() => page.value > 1);
+        const hasNext = computed(() => page.value < Number(props.length));
+        const startPagesFrom = computed(() => {
+            const sideLength = Math.floor(Number(props.visibleCount) / 2);
+
+            if (page.value <= sideLength + 1) {
+                return 2;
+            }
+
+            if (page.value >= Number(props.length) - sideLength) {
+                return Number(props.length) - Number(props.visibleCount);
+            }
+
+            if (Number(props.length) === Number(props.visibleCount)) {
+                return page.value - sideLength - 1;
+            }
+            return page.value - sideLength;
+        });
+        const pages = computed(() => {
+            return Array.from(
+                { length: Number(props.visibleCount) },
+                (_, index) => index + startPagesFrom.value
+            )
+                .filter(pageNum => pageNum > 1 && pageNum < Number(props.length));
+        });
+
+        const setPage = (pageNum: number) => {
+            if (pageNum === page.value) return;
+
+            page.value = pageNum;
+        };
+
+        return {
+            page,
+            hasPrevious,
+            startPagesFrom,
+            setPage,
+            hasNext,
+            chevronIcon,
+            pages
+        };
+    }
+});
+</script>
+
+<style>
+.page-button {
+    min-width: 40px;
+    padding: 0 5px !important;
+    height: 38px;
+}
+</style>