Demos
Wijmo(Vue)
CollectionView
REST CollectionView
RestAPI
Overview

RestCollectionView RestAPI (Vue)

This sample shows how you can extend the RestCollectionView class to create a custom RestCollectionViewExt class that talks to Mescius Demo Service's Grouping and Pagination RestAPI.

The RestCollectionViewExt class supports server-based pagination/virtualization along with server based sorting, filtering.

You can check a sample implementation with server and client code Wijmo-Rest-CollectionView-Sample

Learn about FlexGrid | Loading Data Documentation | CollectionView API Reference

This example uses Vue.

JavaScript
Angular
Vue
React
app.vue
index.html
rest-collection-view-ext.js
Copy to CodeMine
<template>
    <div class="container-fluid">
        <label>

            <input id="paging" type="radio" name="viewtype" value="paging" checked
                @change="toggleFeature('paging')" />Paging
        </label>

        <label>

            <input id="virtualization" type="radio" name="viewtype" value="virtualization"
                @change="toggleFeature('virtualization')" />Virtualization
        </label>

        <br />

        <wj-collection-view-navigator v-if="enablePaging" ref="navRef" :cv="view" :by-page="true" />

        <wj-flex-grid :initialized="flexInitialized" :is-read-only="isReadOnly" :items-source="view">
            <wj-flex-grid-filter />
        </wj-flex-grid>
    </div>
</template>

<script setup>
import { RestCollectionViewExt } from "./rest-collection-view-ext";
import { ref } from "vue";

//
// field info for PurchaseOrders table
const fields = 'OrderId,StockItem,Color,State,City,Quantity,UnitPrice,Date,IsChillerStock'.split(',');

const enablePaging = ref(true);
const isReadOnly = ref(true);
const settings = {
    fields: fields,
    pageSize: 100,
    loading: () => {
        toggleSpinner(flexGrid.value, true);
    },
    loaded: () => {
        toggleSpinner(flexGrid.value, false);
    },
};
const view = ref(null);
const flexGrid = ref(null);

//create RestCollectionViewExt instance 
view.value = new RestCollectionViewExt('purchaseorders', settings);

function flexInitialized(grid) {
    flexGrid.value = grid;
}

//toggle b/w paging and virtualization
function toggleFeature(feature) {
    if (feature === "paging") {
        enablePaging.value = true;
        view.value.pageSize = 100;
        view.value.virtualization = false;
    } else {
        enablePaging.value = false;
        view.value.pageSize = 0;
        view.value.virtualization = true;
    }
}

// show gif loader while data loading
function toggleSpinner(grid, show) {
    let _rect = grid.controlRect;
    let elem = grid.hostElement.querySelector(".spinner");
    if (!elem) elem = wijmo.createElement(`<div class='spinner' style="left:${_rect.left}px;top:${_rect.top}px;width:${_rect.width}px;height:${_rect.height}px;"><img src="resources/Rounded%20blocks.gif"></div>`, grid.hostElement);
    elem.style.display = show ? "block" : "none";
}
</script>

<style>
body {
    margin-bottom: 36pt;
    margin-top: 10px;
}

label {
    padding-right: 10px;
}

.wj-flexgrid {
    height: 400px;
}

.spinner {
    position: absolute;
    z-index: 10;
    opacity: .5;
}

.spinner img {
    margin: auto;
    position: relative;
    top: 40%;
    left: 45%;
}
</style>
<template> <div class="container-fluid"> <label> <input id="paging" type="radio" name="viewtype" value="paging" checked @change="toggleFeature('paging')" />Paging </label> <label> <input id="virtualization" type="radio" name="viewtype" value="virtualization" @change="toggleFeature('virtualization')" />Virtualization </label> <br /> <wj-collection-view-navigator v-if="enablePaging" ref="navRef" :cv="view" :by-page="true" /> <wj-flex-grid :initialized="flexInitialized" :is-read-only="isReadOnly" :items-source="view"> <wj-flex-grid-filter /> </wj-flex-grid> </div> </template> <script setup> import { RestCollectionViewExt } from "./rest-collection-view-ext"; import { ref } from "vue"; // // field info for PurchaseOrders table const fields = 'OrderId,StockItem,Color,State,City,Quantity,UnitPrice,Date,IsChillerStock'.split(','); const enablePaging = ref(true); const isReadOnly = ref(true); const settings = { fields: fields, pageSize: 100, loading: () => { toggleSpinner(flexGrid.value, true); }, loaded: () => { toggleSpinner(flexGrid.value, false); }, }; const view = ref(null); const flexGrid = ref(null); //create RestCollectionViewExt instance view.value = new RestCollectionViewExt('purchaseorders', settings); function flexInitialized(grid) { flexGrid.value = grid; } //toggle b/w paging and virtualization function toggleFeature(feature) { if (feature === "paging") { enablePaging.value = true; view.value.pageSize = 100; view.value.virtualization = false; } else { enablePaging.value = false; view.value.pageSize = 0; view.value.virtualization = true; } } // show gif loader while data loading function toggleSpinner(grid, show) { let _rect = grid.controlRect; let elem = grid.hostElement.querySelector(".spinner"); if (!elem) elem = wijmo.createElement(`<div class='spinner' style="left:${_rect.left}px;top:${_rect.top}px;width:${_rect.width}px;height:${_rect.height}px;"><img src="resources/Rounded%20blocks.gif"></div>`, grid.hostElement); elem.style.display = show ? "block" : "none"; } </script> <style> body { margin-bottom: 36pt; margin-top: 10px; } label { padding-right: 10px; } .wj-flexgrid { height: 400px; } .spinner { position: absolute; z-index: 10; opacity: .5; } .spinner img { margin: auto; position: relative; top: 40%; left: 45%; } </style>
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo RestCollectionView RestAPI</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="compiler.js" type="module"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.21.5/system.src.js" integrity="sha512-skZbMyvYdNoZfLmiGn5ii6KmklM82rYX2uWctBhzaXPxJgiv4XBwJnFGr5k8s+6tE1pcR1nuTKghozJHyzMcoA==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app.js'); </script> </head> <body> <div id="app"> </div> </body> </html>
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) { return new (P || (P = Promise))(function (resolve, reject) { function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } } function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } } function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); } step((generator = generator.apply(thisArg, _arguments || [])).next()); }); }; import { RestCollectionView } from '@mescius/wijmo.rest'; import { DataType, isDate, DateTime, asNumber, isBoolean, httpRequest, copy, changeType, isString } from '@mescius/wijmo'; const _apiUrl = "https://demodata.mescius.io/wwi/api/v1/"; /** * Class that extends {@link RestCollectionView} to support RestAPI data sources. */ export class RestCollectionViewExt extends RestCollectionView { /** * Initializes a new instance of the {@link RestCollectionViewExt} class. * * @param tableName Name of the table (entity) to retrieve from the service. * @param options JavaScript object containing initialization data (property * values and event handlers) for the {@link RestCollectionView}. */ constructor(tableName, options) { super(); this._url = _apiUrl; this._tbl = tableName; copy(this, options); } // parse json data _jsonReviver(key, value) { const _rxDate = /^\d{4}\-\d{2}\-\d{2}T\d{2}\:\d{2}\:\d{2}|\/Date\([\d\-]*?\)/; if (typeof value === 'string' && _rxDate.test(value)) { value = value.indexOf('/Date(') == 0 // verbosejson ? new Date(parseInt(value.substr(6))) : new Date(value); } return value; } // get parameter for sorting, filtering, paging and virtualization _getReadParams() { let settings = {}; // apply filter if (this.filterOnServer && this._filterProvider) { let filter = this._asODataFilter(this._filterProvider); if (filter.length > 0) { settings.filterBy = filter; } } //apply sortBy if (this.sortOnServer && this.sortDescriptions.length > 0) { let _sortBy = []; for (let i = 0; i < this.sortDescriptions.length; i++) { let sort = `${this.sortDescriptions[i].property} ${this.sortDescriptions[i].ascending ? 'ASC' : 'DESC'}`; _sortBy.push(sort); // add sort } settings.sortBy = _sortBy.join(','); } // current view window if (this.virtualization) { settings.skip = this._start; settings.top = this._fetchSize(); } // get page params if (this.pageOnServer && this.pageSize > 0) { settings.skip = this.pageIndex * this.pageSize; settings.top = this.pageSize; } if (this.fields && this.fields.length > 0) { settings.select = this.fields; } return settings; } // ** overrides getItems() { // cancel any pending requests if (this._pendingReq) { this._pendingReq.abort(); } return new Promise(resolve => { let _settings = this._getReadParams(); // get the items virtually this._pendingReq = httpRequest(this._url + this._tbl, { requestHeaders: this.requestHeaders, data: _settings, success: (xhr) => __awaiter(this, void 0, void 0, function* () { // parse response let resp = JSON.parse(xhr.responseText, this._jsonReviver); let _count = asNumber(resp.totalItemCount); if (_count != this._totalItemCount) this._totalItemCount = _count; resolve(resp.items); }), error: xhr => this._raiseError(xhr.responseText, false), complete: xhr => { this._pendingReq = null; } // no pending requests }); }); ; } //#region Filter Implementation // gets the OData filter definition from a wijmo.grid.filter.FlexGridFilter object. // https://www.odata.org/documentation/odata-version-2-0/uri-conventions/ _asODataFilter(filter) { let def = ''; for (let c = 0; c < filter.grid.columns.length; c++) { let col = filter.grid.columns[c], cf = filter.getColumnFilter(col, false); if (cf && cf.isActive) { if (def) { def += ' and '; } if (cf.conditionFilter && cf.conditionFilter.isActive) { def += this._asODataConditionFilter(cf.conditionFilter); } else if (cf.valueFilter && cf.valueFilter.isActive) { def += this._asODataValueFilter(cf.valueFilter); } } } return def; } _asODataValueFilter(vf) { let col = vf.column, fld = col.binding, map = col.dataMap, def = ''; // build condition with 'eq/or' for (let key in vf.showValues) { let value = changeType(key, col.dataType, col.format); if (map && isString(value)) { // TFS 239356 value = map.getKeyValue(value); } if (def) def += ' or '; def += this._asEquals(fld, value, col.dataType); } // enclose in parenthesis if not empty if (def.length) { def = '(' + def + ')'; } // all done return def; } _asEquals(fld, value, type) { let def = '', DT = DataType; if (value === '' || value == null) { // null or empty def += fld + ' eq null'; if (type == DT.String) { // empty OK for strings only def += ' or ' + fld + ' eq \'\''; } } else if (type == DT.Date) { // non-null/empty dates (TFS 458080) def += fld + ' ge ' + this._asODataValue(value, type) + ' and ' + fld + ' lt ' + this._asODataValue(DateTime.addDays(value, 1), type); } else { // other types def += fld + ' eq ' + this._asODataValue(value, type); } return '(' + def + ')'; } _asODataConditionFilter(cf) { let c1 = this._asODataCondition(cf, cf.condition1), c2 = this._asODataCondition(cf, cf.condition2); if (c1 && c2) return '(' + c1 + (cf.and ? ' and ' : ' or ') + c2 + ')'; if (c1) return '(' + c1 + ')'; if (c2) return '(' + c2 + ')'; return null; } _asODataCondition(cf, cnd) { let col = cf.column, fld = col.binding, map = col.dataMap, value = cnd.value; if (map && isString(value)) { // TFS 440901 value = map.getKeyValue(value); } value = this._asODataValue(value, cf.column.dataType); switch (cnd.operator) { case 0: // EQ = 0, return fld + ' eq ' + value; case 1: // NE = 1, return fld + ' ne ' + value; case 2: // GT = 2, return fld + ' gt ' + value; case 3: // GE = 3, return fld + ' ge ' + value; case 4: // LT = 4, return fld + ' lt ' + value; case 5: // LE = 5, return fld + ' le ' + value; case 6: // BW = 6, return `${fld} starts-with ${value}`; case 7: // EW = 7, return `${fld} ends-with ${value}`; case 8: // CT = 8, return `${fld} contains ${value}`; case 9: // NC = 9 return `${fld} not-contains ${value}`; case 10: // NBW = 10 return `${fld} not-starts-with ${value}`; case 11: // NEW = 11 return `${fld} not-ends-with ${value}`; } } _asODataValue(value, dataType) { if (isDate(value)) { value = `'${value.toJSON()}'`; return value; } else if (isString(value)) { return "'" + value.replace(/'/g, "''") + "'"; } else if (isBoolean(value)) { return "'" + value + "'"; } else if (value != null) { return value.toString(); } return dataType == DataType.String ? "''" : null; } }
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