cahpter 15 LessonGrid.vue revised

LessonGrid.vue

<template>
    <div class="row">
        <div class="col-lg-12">
            <form id="search">
                Search <input name="query" v-model="query" @keyup="search(query)">
            </form>
            <div class="pull-right">
                {{ total }} Total Results
            </div>
            <section class="panel">
                <div class="panel-body">

                    <table class="table table-bordered table-striped">

                        <thead>
                        <tr>
                            <th v-for="key in gridColumns"
                                @click="sortBy(key)"
                                v-bind:class="{active: sortKey == key}">
                                {{ key }}
                                <span class="arrow"
                                      v-bind:class="sortOrder > 0 ? 'asc' : 'dsc'">
                                </span>
                            </th>
                            <th>Actions</th>
                        </tr>
                        </thead>
                        <tbody>
                        <tr v-for="row in gridData">
                            <td>
                                {{ row.Id }}
                            </td>
                            <td>
                                <a v-bind:href="'/lesson/' + row.Id + '-' + row.Slug "> {{ row.Name }}</a>
                            </td>
                            <td>
                                {{ row.Category }}
                            </td>
                            <td>
                                {{ row.Subcategory }}
                            </td>
                            <td>
                                {{ row.Created }}
                            </td>
                            <td ><a v-bind:href="'/lesson/' + row.Id + '/edit'">
                                    <button type="button" class="btn btn-default">
                                        Edit
                                    </button>
                                </a>
                            </td>
                        </tr>
                        </tbody>
                    </table>
                </div>

                <div class="pull-right">

                    page {{ current_page }} of   {{ last_page }} pages
                </div>

            </section>
            <div class="row">
                <div class="pull-right for-page-button">

                    <button @click="getData(go_to_page)"class="btn btn-default">
                        Go To Page:</button>
                    <input v-model="go_to_page" class="number-input"></input>

                </div>


                <ul class="pagination pull-right">
                    <li><a @click.prevent="getData(first_page_url)"> first </a></li>
                    <li v-if="checkUrlNotNull(prev_page_url)">
                        <a @click.prevent="getData(prev_page_url)" >prev</a>
                    </li>
                    <li v-for="page in pages"
                        v-if="page > current_page - 2 && page < current_page + 2"
                        v-bind:class="{'active': checkPage(page)}">
                        <a @click.prevent="getData(page)">{{ page }}</a>
                    </li>
                    <li v-if="checkUrlNotNull(next_page_url)">
                        <a @click.prevent="getData(next_page_url)">next</a>
                    </li>
                    <li><a @click.prevent="getData(last_page_url)"> last </a></li>
                </ul>
            </div>
        </div>
    </div>

</template>

<script>
    export default {
        mounted: function () {
            this.loadData();
        },
        data: function () {
            return {
                query: '',
                gridColumns: ['Id', 'Name', 'Category', 'Subcategory','Created'],
                gridData: [],
                total: null,
                next_page_url: null,
                prev_page_url: null,
                last_page: null,
                current_page: null,
                pages: [],
                first_page_url: null,
                last_page_url: null,
                go_to_page: null,
                sortOrder: 1,
                sortKey: ''
            }
        },
        methods: {
            sortBy: function (key){
                this.sortKey = key;
                this.sortOrder = (this.sortOrder == 1) ? -1 : 1;
                this.getData(1);
            },
            search: function(query){
                this.getData(query);
            },
            loadData: function (){
                $.getJSON('api/lesson-data', function (data) {
                    this.gridData = data.data;
                    this.total = data.total;
                    this.last_page =  data.last_page;
                    this.next_page_url = data.next_page_url;
                    this.prev_page_url = data.prev_page_url;
                    this.current_page = data.current_page;
                    this.first_page_url = 'api/lesson-data?page=1';
                    this.last_page_url = 'api/lesson-data?page=' + this.last_page;
                    this.setPageNumbers();
                }.bind(this));
            },
            setPageNumbers: function(){
                for (var i = 1; i <= this.last_page; i++) {
                    this.pages.push(i);
                }
            },
            getData: function (request){
                let getPage;
                switch (request){
                    case this.prev_page_url :
                        getPage = this.prev_page_url +
                            '&column=' + this.sortKey +
                            '&direction=' + this.sortOrder;
                        break;
                    case this.next_page_url :
                        getPage = this.next_page_url +
                            '&column=' + this.sortKey +
                            '&direction=' + this.sortOrder;
                        break;
                    case this.first_page_url :
                        getPage = this.first_page_url +
                            '&column=' + this.sortKey +
                            '&direction=' + this.sortOrder;
                        break;
                    case this.last_page_url :
                        getPage = this.last_page_url +
                            '&column=' + this.sortKey +
                            '&direction=' + this.sortOrder;
                        break;
                    case this.query :
                        getPage = 'api/lesson-data?' +
                            'keyword=' + this.query +
                            '&column=' + this.sortKey +
                            '&direction=' + this.sortOrder;
                        break;
                    case this.go_to_page :
                        if( this.go_to_page != '' && this.pageInRange()){
                            getPage = 'api/lesson-data?' +
                                'page=' + this.go_to_page +
                                '&column=' + this.sortKey +
                                '&direction=' + this.sortOrder +
                                '&keyword=' + this.query;
                            this.clearPageNumberInputBox();
                        } else {
                            alert('Please enter a valid page number');
                        }
                        break;
                    default :
                        getPage = 'api/lesson-data?' +
                            'page=' + request +
                            '&column=' + this.sortKey +
                            '&direction=' + this.sortOrder +
                            '&keyword=' + this.query;
                        break;
                }
                if (this.query == '' && getPage != null){
                    $.getJSON(getPage, function (data) {
                        this.gridData = data.data;
                        this.total = data.total;
                        this.last_page =  data.last_page;
                        this.next_page_url = data.next_page_url;
                        this.prev_page_url = data.prev_page_url;
                        this.current_page = data.current_page;
                    }.bind(this));
                } else {
                    if (getPage != null){
                        $.getJSON(getPage, function (data) {
                            this.gridData = data.data;
                            this.total = data.total;
                            this.last_page =  data.last_page;
                            this.next_page_url = (data.next_page_url == null) ? null : data.next_page_url + '&keyword=' +this.query;
                            this.prev_page_url = (data.prev_page_url == null) ? null : data.prev_page_url + '&keyword=' +this.query;
                            this.first_page_url = 'api/lesson-data?page=1&keyword=' +this.query;
                            this.last_page_url = 'api/lesson-data?page=' + this.last_page + '&keyword=' +this.query;
                            this.current_page = data.current_page;
                            this.resetPageNumbers();
                        }.bind(this));
                    }
                }
            },
            checkPage: function(page){
                return page == this.current_page;
            },
            resetPageNumbers: function(){
                this.pages = [];
                for (var i = 1; i <= this.last_page; i++) {
                    this.pages.push(i);
                }
            },
            checkUrlNotNull: function(url){
                return url != null;
            },
            clearPageNumberInputBox: function(){
                return this.go_to_page = '';
            },
            pageInRange: function(){
                return this.go_to_page <= parseInt(this.last_page);
            }
        }
    }
</script>