Fast Scroller (iOS-style)

The iPad contact list uses a fast scroller to make it easier to look up people by clicking their initials. This sample implements something similar by adding a vertical list of initials near the right edge of a grid. When users click or type an initial, the grid scrolls to show the first contact that matches the request:

import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './styles.css'; import * as wjCore from '@grapecity/wijmo'; import * as wjGrid from '@grapecity/wijmo.grid'; // document.readyState === 'complete' ? init() : window.onload = init; // function init() { // // create the data let data = []; var first = 'Adeline,Alexander,Alice,Amelia,Andrew,Arabella,Aria,Aryan,Asher,Astrid,Audrey,Aurelia,Aurora,Austin,Ava,Axel,Benjamin,Bodhi,Caleb,Callum,Caroline,Charlotte,Chloe,Claire,Cora,Daniel,Declan,Eleanor,Eli,Elijah,Elise,Elizabeth,Ella,Eloise,Emily,Emma,Esme,Ethan,Evangeline,Ezra,Felix,Finn,Genevieve,Grace,Hazel,Henry,Imogen,Isaac,Isabella,Isla,Ivy,Jack,Jacob,James,Jane,Jasper,John,Julian,Khaleesi,Leo,Levi,Liam,Lucas,Lucy,Luke,Luna,Lydia,Maeve,Matthew,Maxwell,Maya,Mia,Mila,Miles,Milo,Nathaniel,Nora,Oliver,Olivia,Ophelia,Oscar,Penelope,Roman,Rose,Sadie,Samuel,Scarlett,Sebastian,Silas,Soren,Stella,Thea,Theodore,Thomas,Violet,William,Wyatt,Xavier,Zachary'.split(','); var last = 'Adams,Alexander,Allen,Anderson,Bailey,Baker,Barnes,Bell,Bennett,Black,Boyd,Brooks,Brown,Bryant,Burns,Butler,Campbell,Carter,Clark,Cole,Coleman,Collins,Cook,Cooper,Cox,Crawford,Cruz,Daniels,Davis,Diaz,Dixon,Edwards,Ellis,Evans,Fisher,Flores,Ford,Foster,Freeman,Garcia,Gibson,Gomez,Gonzales,Gonzalez,Gordon,Graham,Gray,Green,Griffin,Hall,Hamilton,Harris,Harrison,Hayes,Henderson,Henry,Hernandez,Hicks,Hill,Holmes,Howard,Hughes,Hunt,Hunter,Iachetta,Jackson,James,Jenkins,Johnson,Jones,Jordan,Kelly,Kennedy,King,Lee,Lewis,Long,Lopez,Marshall,Martin,Martinez,Mason,Mcdonald,Miller,Mitchell,Moore,Morales,Morgan,Morris,Murphy,Murray,Myers,Nelson,Ortiz,Owens,Parker,Patterson,Perez,Perry,Peterson,Phillips,Porter,Powell,Price,Quaid,Ramirez,Ramos,Reed,Reyes,Reynolds,Rice,Richardson,Rivera,Roberts,Robertson,Robinson,Rodriguez,Rogers,Ross,Russell,Sanchez,Sanders,Scott,Shaw,Simmons,Simpson,Smith,Stevens,Stewart,Sullivan,Taylor,Thomas,Thompson,Torres,Tucker,Turner,Udell,Valentine,Vaughan,Vickers,Walker,Wallace,Ward,Warren,Washington,Watson,Webb,Wells,West,White,Williams,Wilson,Wood,Woods,Wright,Xanders,Xavier,Young,Zabinski,Zacharias'.split(','); for (var i = 0; i < 1000; i++) { data.push({ first: first[Math.floor(Math.random() * first.length)], last: last[Math.floor(Math.random() * last.length)], }); } // // group and sort it with a CollectionView var view = new wjCore.CollectionView(data, { sortDescriptions: ['last', 'first'], groupDescriptions: [ new wjCore.PropertyGroupDescription('last', function (item, propName) { return item[propName][0]; }) ] }); view.moveCurrentToFirst(); // // show the data in a FlexGrid var theGrid = new wjGrid.FlexGrid('#theGrid', { autoGenerateColumns: false, columns: [ { binding: 'last', width: '*' } ], headersVisibility: 'None', alternatingRowStep: 0, isReadOnly: true, itemsSource: view, formatItem: function (s, e) { if (e.panel == s.cells && s.columns[e.col].binding == 'last') { var row = s.rows[e.row]; var item = s.rows[e.row].dataItem; e.cell.innerHTML = row instanceof wjGrid.GroupRow ? wjCore.format('&nbsp;&nbsp;<b>{name}</b>', item) : wjCore.format('{first} <b>{last}</b>', item); } } }); // // create the fast scroller element var theScroller = document.createElement('div'); theScroller.classList.add('fast-scroller'); for (var i = 65; i <= 90; i++) { var initial = wjCore.createElement('<div>' + String.fromCharCode(i) + '</div>'); theScroller.appendChild(initial); } theGrid.hostElement.firstElementChild.appendChild(theScroller); theScroller.addEventListener('mousedown', function (e) { // // get initial we're looking for var initial = e.target.textContent; scrollTo(initial); e.preventDefault(); }); // // allow scrolling by typing the initial as well theGrid.hostElement.addEventListener('keypress', function (e) { scrollTo(String.fromCharCode(e.keyCode)); }); // // scroll the grid to show a given initial function scrollTo(initial) { if (initial.length == 1) { initial = initial.toUpperCase(); for (var i = 0; i < theGrid.rows.length; i++) { var row = theGrid.rows[i]; if (row instanceof wjGrid.GroupRow && row.dataItem.name == initial) { var rc = theGrid.cells.getCellBoundingRect(i, 0, true); var pt = theGrid.scrollPosition; // // scroll with animation if (true) { wjCore.animate(function (pct) { var y = (pt.y * (1 - pct)) + (-rc.top * pct); theGrid.scrollPosition = new wjCore.Point(pt.x, y); }, 300); } else { // or without theGrid.scrollPosition = new wjCore.Point(pt.x, -rc.top); } break; } } } } // }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity Wijmo FlexGrid Fast Scroller</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="node_modules/systemjs/dist/system.src.js"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div class="container-fluid"> <div id="theGrid"> </div> </div> </body> </html>
.wj-flexgrid { font-size: 120%; height: 80vh; } .wj-flexgrid .wj-cell { padding: 6px; border: none; } .wj-flexgrid .wj-group:not(.wj-state-selected):not(.wj-state-multi-selected) { background-color: #f0f0f0; } .fast-scroller { display: flex; flex-flow: column wrap; height: 100%; padding: 2em 0; justify-content: center; align-items: center; position: absolute; top: 0; right: 2.5em; cursor: pointer; font-size: 80%; font-weight: 800; color: navy; opacity: .5; } .fast-scroller div { text-align: center; padding: 0 3px; } body { margin-bottom: 20px; }
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