Image css class field name.
Examples
Default Name
<div id="tree"></div>
<script>
var tree = $('#tree').tree({
uiLibrary: 'bootstrap',
dataSource: [ { text: 'folder', imageCssClass: 'glyphicon glyphicon-folder-close', children: [ { text: 'file', imageCssClass: 'glyphicon glyphicon-file' } ] } ]
});
</script>
Custom Name
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css" rel="stylesheet">
<div id="tree"></div>
<script>
var tree = $('#tree').tree({
imageCssClassField: 'faCssClass',
dataSource: [ { text: 'folder', faCssClass: 'fa fa-folder', children: [ { text: 'file', faCssClass: 'fa fa-file' } ] } ]
});
</script>