Demo - Auto-Sizing

HTML

<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<link rel="stylesheet" href="http://prerelease.componentone.com/wijmo5/latest/styles/wijmo.min.css">
<script src="http://prerelease.componentone.com/wijmo5/latest/controls/wijmo.min.js"></script>
<script src="http://prerelease.componentone.com/wijmo5/latest/controls/wijmo.input.min.js"></script>
<script src="http://prerelease.componentone.com/wijmo5/latest/controls/wijmo.grid.min.js"></script>
<div class="container">

  <h1>
    Auto-Sizing Performance</h1>
  <p>
    The FlexGrid has <b>autoSizeColumns</b> and <b>autoSizeRows</b>
    methods you can call to automatically size rows and columns
    to fit their content.</p>
  <p>
    With large datasets, these methods can be slow. This sample logs the performance of the functions (in milliseconds) and reports it in the console.</p>  
  <p>
    Click this button to size the columns of the
    grid below to fit their content:</p>
  <button id="autoSizeColumns" class="btn byn-default">
    autoSizeColumns
  </button>
    <label for="quickAutoSize">quickAutoSize</label>
  <input id="quickAutoSize" type="checkbox" checked="checked">
  <div id="theGrid"></div>
  
  <div class="panel panel-warning">
    <div class="panel-heading">
      Automatically resizing rows and columns is one of the
      most time-consuming grid operations. As of build 379, we have added an optimization that vastly improves performance for unformatted cells. This new feature is available by setting quickAutoSize=true.
    </div>
  </div>
</div>

CSS

.wj-flexgrid {
  height: 400px; 
  margin:10px 0;
}

JavaScript

onload = function () {

  // generate some random data
  var countries = 'US,Germany,UK,Japan,Italy,Greece'.split(','),
      data = [];
  for (var i = 0; i < 20000; i++) {
    data.push({
    	id: i,
      country: countries[i % countries.length],
      downloads: Math.round(Math.random() * 20000),
      sales: Math.random() * 10000,
      expenses: Math.random() * 5000
    });
  }

  var theGrid = new wijmo.grid.FlexGrid('#theGrid', {
  	quickAutoSize: true,
  	autoGenerateColumns: false,
    columns:[
			{ binding: 'id', header: 'ID', width: 60 },
			{ binding: 'country', header: 'Country'},
			{ binding: 'sales', header: 'Sales'},
			{ binding: 'expenses', header: 'Expenses'}
    ],
    itemsSource: data
  });
  
  document.getElementById('quickAutoSize').addEventListener('click', function(e) {
  	theGrid.quickAutoSize = e.target.checked;
  })
  
  // autosize when pressing button
  document.getElementById('autoSizeColumns').addEventListener('click', function() {
  	console.time("autoSizeColumns, quickAutoSize=" + theGrid.quickAutoSize);
  	theGrid.autoSizeColumns();
    console.timeEnd("autoSizeColumns, quickAutoSize=" + theGrid.quickAutoSize);
  })
 
}