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How to expand/collapse the TreeGrid rows at specific hierarchical levels

Platform: JavaScript |
Control: ejTreeGrid |
Published Date: July 28, 2016 |
Last Revised Date: May 29, 2019

It is possible to expand and collapse the records at a specific hierarchical level in TreeGrid, by using the expandAtLevel and collapseAtLevel public methods,

The below code example explains about how to expand and collapse records at specific levels

<div id="TreeGridContainer" style="height:400px;width:100%"></div>
<button onclick="expand()" style="margin-top:10px">Expand</button>
<button onclick="collapse()" style="margin-top:10px">Collapse</button>
<script type="text/javascript">
$(function () {
            $("#TreeGridContainer").ejTreeGrid({
                //...
                dataSource: projectData,
                enableCollapseAll: true,
          })
        }); 
        function expand() {
            var treeObj = $("#TreeGridContainer").data("ejTreeGrid");
            //To expand the records at specific level, we need to pass the hierarchy level as method parameter
            treeObj.expandAtLevel(2);
        }
        function collapse() {
            var treeObj = $("#TreeGridContainer").data("ejTreeGrid");
          //To collapse the record at specific level, we need to pass the specific hierarchy level as method parameter.
            treeObj.collapseAtLevel(1);
        }
</script>

Sample to expand/collapse records at particular level is available in the following link,

Sample

 

 

 

 

 

 

 

 

 

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