Freez , filter and show/hide column in Syncfusion Angular TreeGrid

Syncfusion Angular can help develop angular applications faster with many featured components that look like TreeGrid.

According to the documentation, "Syncfusion Angular UI (Essential JS 2) is a collection of modern TypeScript based true Angular Components. It has support for Ahead Of Time (AOT) compilation and Tree-Shaking. All the components are developed from the ground up to be lightweight, responsive, modular, and touch-friendly".

In this article,we learn how to freez,show/hide and filter column in Syncfusion Angular TreeGrid . I will create backend Api with nodejs, but in this article I will show Syncfusion Angular Treegrid.

Firstly, we create an angular project and add Syncfusion to the project using the getting started guide. For this example, I will use stackblitz.com and you can also start with some examples from documentation like this.

To add a context menu to our project, in appcomponent.ts add the code below:

this.contextMenuItems = [
      { text: 'Show', target: '.e-headercontent', id: 'columnChooser' },
      { text: 'Freeze', target: '.e-headercontent', id: 'freeze' },

      { text: 'Filter', target: '.e-headercontent', id: 'filter' },
    ];

In app.component.html we change code below :

 <ejs-treegrid
    #treegrid
    [dataSource]="data"
    [treeColumnIndex]="1"

    [allowFiltering]="filtering"
    [allowSorting]="sorting"
    [sortSettings]='sortSettings' 
    [allowResizing]="true"
    [allowTextWrap]="textWrap"
    allowReordering="true"
    [allowRowDragAndDrop]="true"
    [editSettings]="editSettings"
    [allowSelection]="true"
    [selectionSettings]="selectionOptions"
    [toolbar]="toolbar"
    [pageSettings]="pageSettings"
    [filterSettings]="filterSettings"
    height="100vh"
    width="100vw"
    idMapping="TaskID"
    parentIdMapping="ParentItem"
    hasChildMapping="isParent"
    [contextMenuItems]="contextMenuItems"
    (contextMenuOpen)="contextMenuOpen($event)"
    (contextMenuClick)="contextMenuClick($event)"
    (dataBound)="dataBound()"
    (toolbarClick)="toolabarclickHandler($event)"
    (actionBegin)="actionBegin($event)"
    (actionComplete)="actionComplete($event)"
    [columns]="treeColumns"
    (rowSelected)="rowSelected($event)"
  >
  </ejs-treegrid>

We will create contextMenuOpen function like the code below:

contextMenuOpen(arg?: BeforeOpenCloseEventArgs): void {
    this.rowIndex = arg.rowInfo.rowIndex;
    let elem: Element = arg.event.target as Element;


    if (elem.closest('.e-column')) {

      document
        .querySelectorAll('li#freeze')[0]
        .setAttribute('style', 'display: block;');
      document
        .querySelectorAll('li#columnChooser')[0]
        .setAttribute('style', 'display: block;');
      document
        .querySelectorAll('li#filter')[0]
        .setAttribute('style', 'display: block;');

    }
  }

For menu event we write function contextMenuClick code below:

 contextMenuClick(args): void {
    if (args.item.id === 'columnChooser') {
      this.showChooser = !this.showChooser;
    } else if (args.item.id === 'filter') {
      this.filtering = true;
      console.log('this.filtering:', this.filtering);
    } else if (args.item.id === 'freeze') {
      this.treegrid.frozenColumns = this.columnValue;
    }
  }

Now our app can freez, filter and show/hide columnlike in the image below:

To sum up, in this project, we learned how to use the freez,filter and show/hide columns in Syncfusion Angular TreeGrid. You can find the code link.