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Row in ASP.NET Core Tree Grid control

22 Jul 2021 / 4 minutes to read

The row represents record details fetched from data source.

Customize rows

You can customize the appearance of a row by using the rowDataBound event. The rowDataBound event triggers for every row. In the event handler, you can get the args which contains details of the row.

tagHelper

CustomizeRows.cs

<ejs-treegrid id="TreeGrid" dataSource="@ViewBag.datasource" height="275" enableHover="false" rowDataBound="rowDataBound" childMapping="Children" treeColumnIndex="1">
    <e-treegrid-columns>
        <e-treegrid-column field="TaskId" headerText="Task ID" textAlign="Right" width="90"></e-treegrid-column>
        <e-treegrid-column field="TaskName" headerText="Task Name" width="180"></e-treegrid-column>
        <e-treegrid-column field="StartDate" headerText="Start Date" textAlign="Right"
            format="yMd" width="90"></e-treegrid-column>
        <e-treegrid-column field="Duration" headerText="Duration" textAlign="Right" width="80"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>



<script>
    function rowDataBound(args) {
        if (args.data['Duration'] > 5) {
            args.row.style.background = '#336c12';
        } else if (args.data['Duration'] < 5) {
            args.row.style.background = '#7b2b1d';
        }
    }
</script>

public IActionResult Index()
{
    var tree = TreeData.GetDefaultData();
    ViewBag.datasource = tree;
    return View();
}

Styling alternate rows

You can change the treegrid’s alternative rows’ background color by overriding the .e-altrow class.

.e-treegrid .e-altrow {
    background-color: #ffd800;
}

Please refer to the following example.

tagHelper

alternateRows.cs

<ejs-treegrid id="TreeGrid" dataSource="@ViewBag.datasource" height="275" enableHover="false" childMapping="Children" treeColumnIndex="1">
    <e-treegrid-columns>
        <e-treegrid-column field="TaskId" headerText="Task ID" textAlign="Right" width="90"></e-treegrid-column>
        <e-treegrid-column field="TaskName" headerText="Task Name" width="180"></e-treegrid-column>
        <e-treegrid-column field="StartDate" headerText=" Start Date" textAlign="Right"
            format="yMd" width="90"></e-treegrid-column>
        <e-treegrid-column field="Duration" headerText="Duration" textAlign="Right" width="80"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>

<style>
    .e-treegrid .e-altrow {
        background-color: #ffd800;
    }
</style>

public IActionResult Index()
{
    var tree = TreeData.GetDefaultData();
    ViewBag.datasource = tree;
    return View();
}

Row height

You can customize the row height of treegrid rows through the rowHeight property. The rowHeight property is used to change the row height of entire treegrid rows.

In the below example, the rowHeight is set as 60px.

tagHelper

rowHeight.cs

<ejs-treegrid id="TreeGrid" dataSource="@ViewBag.datasource" rowHeight="60" height="275" enableHover="false" childMapping="Children" treeColumnIndex="1">
    <e-treegrid-columns>
        <e-treegrid-column field="TaskId" headerText="Task ID" textAlign="Right" width="90"></e-treegrid-column>
        <e-treegrid-column field="TaskName" headerText="Task Name" width="180"></e-treegrid-column>
        <e-treegrid-column field="StartDate" headerText=" Start Date" textAlign="Right" format="yMd" width="90"></e-treegrid-column>
        <e-treegrid-column field="Duration" headerText="Duration" textAlign="Right" width="80"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>

public IActionResult Index()
{
    var tree = TreeData.GetDefaultData();
    ViewBag.datasource = tree;
    return View();
}

Customize row height for particular row

Grid row height for particular row can be customized using the rowDataBound event by setting the rowHeight in arguments for each row based on the requirement.

In the below example, the row height for the row with Task ID as ‘3’ is set as ‘90px’ using the rowDataBound event.

tagHelper

customizeRowHeight.cs

<ejs-treegrid id="TreeGrid" dataSource="@ViewBag.datasource" rowDataBound="rowDataBound" height="275" enableHover="false" childMapping="Children" treeColumnIndex="1">
    <e-treegrid-columns>
        <e-treegrid-column field="TaskId" headerText="Task ID" textAlign="Right" width="90"></e-treegrid-column>
        <e-treegrid-column field="TaskName" headerText="Task Name" width="180"></e-treegrid-column>
        <e-treegrid-column field="StartDate" headerText=" Start Date" textAlign="Right" 
                format="yMd" width="90"></e-treegrid-column>
        <e-treegrid-column field="Duration" headerText="Duration" textAlign="Right" width="80"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>

<script>
    function rowDataBound(args) {
        if(args.data.TaskId === 3){
            args.rowHeight = 90;
        }
    }
</script>

public IActionResult Index()
{
    var tree = TreeData.GetDefaultData();
    ViewBag.datasource = tree;
    return View();
}

Row template

The rowTemplate has an option to customise the look and behavior of the treegrid rows. The rowTemplate property accepts either the template string or HTML element ID.

tagHelper

row-template.cs

<ejs-treegrid id="TreeGrid" rowHeight="83" dataSource="ViewBag.datasource" height="250" childMapping="Children" treeColumnIndex="0" rowTemplate="#rowtemplate">
    <e-treegrid-columns>
        <e-treegrid-column field="EmpID" headerText="Employee ID" width="150"></e-treegrid-column>
        <e-treegrid-column field="Name" headerText="Employee Name" width="150"></e-treegrid-column>
        <e-treegrid-column field="Address" headerText="Employee Details" width="300"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>

    <script id="rowtemplate" type="text/x-template">
        <tr>
            <td class="border" style='padding-left:18px;'>
                <div>${EmpID}</div>
            </td>
            <td class="border" style='padding: 10px 0px 0px 20px;'>
                <div style="font-size:14px;">
                    ${Name}
                    <p style="font-size:9px;">${Designation}</p>
                </div>
            </td>
            <td class="border">
                <div>
                    <div style="position:relative;display:inline-block;">
                        <img src="/images/TreeGrid/${FullName}.png" alt="${FullName}" />
                    </div>
                    <div style="display:inline-block;">
                        <div style="padding:5px;">${Address}</div>
                        <div style="padding:5px;">${Country}</div>
                        <div style="padding:5px;font-size:12px;">${Contact}</div>
                    </div>
                </div>
            </td>
        </tr>
    </script>
    <style type="text/css">
        .border {
            border-color: #e0e0e0;
            border: 1px solid #e0e0e0;
            border-width: 1px 0 0 0;
        }

        img {
            width: 60px;
            height: 60px;
            vertical-align: baseline;
            border-radius: 50px;
            margin-left: 20px;
            background-repeat: no-repeat;
        }
    </style>

public IActionResult RowTemplate()
        {
            ViewBag.datasource = TreeData.GetTemplateData();
            return View();
        }

The rowTemplate property accepts only the TR element.

Row template with formatting

If the rowTemplate is used, the value cannot be formatted inside the template using the format property. In that case, a function should be defined globally to format the value and invoke it inside the template.

tagHelper

rowtemplate-formatting.cs

<ejs-treegrid id="TreeGrid" rowHeight="83" dataSource="ViewBag.datasource" height="250" childMapping="Children" treeColumnIndex="0" rowTemplate="#rowtemplate">
            <e-treegrid-columns>
                <e-treegrid-column field="EmpID" headerText="Employee ID" width="150"></e-treegrid-column>
                <e-treegrid-column field="Address" headerText="Employee Details" width="350"></e-treegrid-column>
                <e-treegrid-column field="DOB" headerText="DOB" width="150"></e-treegrid-column>
            </e-treegrid-columns>
        </ejs-treegrid>

    <script id="rowtemplate" type="text/x-template">
        <tr>
            <td class="border" style='padding-left:18px;'>
                <div>${EmpID}</div>
            </td>
            <td class="border">
                <div>
                    <div style="position:relative;display:inline-block;">
                        <img src="/images/TreeGrid/${FullName}.png" alt="${FullName}" />
                    </div>
                    <div style="display:inline-block;">
                        <div style="padding:5px;">${Address}</div>
                        <div style="padding:5px;">${Country}</div>
                        <div style="padding:5px;font-size:12px;">${Contact}</div>
                    </div>
                </div>
            </td>
            <td class="border" style='padding-left: 20px;'>
                <div>${DOB.toLocaleDateString()}</div>
            </td>
        </tr>
    </script>
    <style type="text/css">
        .border {
            border-color: #e0e0e0;
            border: 1px solid #e0e0e0;
            border-width: 1px 0 0 0;
        }

        img {
            width: 60px;
            height: 60px;
            vertical-align: baseline;
            border-radius: 50px;
            margin-left: 20px;
            background-repeat: no-repeat;
        }
    </style>

public IActionResult RowTemplate()
        {
            ViewBag.datasource = TreeData.GetTemplateData();
            return View();
        }

Limitations

Row template feature is not compatible with all the features which are available in treegrid and it has limited features support. Here we have listed out the features which are compatible with row template feature.

Filtering
Paging
Sorting
Scrolling
Searching
Rtl
Context Menu
State Persistence

Detail template

The detail template provides additional information about a particular row. By expanding the parent row the child rows are expanded along with their detail template. The detailTemplate property accepts either the template string or HTML element ID.

tagHelper

detailtemplate.cs

<ejs-treegrid id="TreeGrid" dataSource="ViewBag.datasource" height="335" childMapping="Children" treeColumnIndex="0" detailTemplate="#detailtemplate">
    <e-treegrid-columns>
        <e-treegrid-column field="Name" headerText="First Name" width="160"></e-treegrid-column>
        <e-treegrid-column field="DOB" headerText="DOB" width="85" type="date" format="yMd" textAlign='Right'></e-treegrid-column>
        <e-treegrid-column field="Designation" headerText="Designation" width="147"></e-treegrid-column>
        <e-treegrid-column field="EmpID" headerText="EmployeeID" width="125"></e-treegrid-column>
        <e-treegrid-column field="Country" headerText="Country" width="148"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>

    <script id="detailtemplate" type="text/x-template">
        <div style="position:relative;display:inline-block;float:left;font-weight:bold;width:10%;padding:5px 4px 2px 27px;">
            <img src="/images/TreeGrid/${FullName}.png" alt="${FullName}" />
        </div>
        <div style="padding-left: 10px;display: inline-block;width: 66%;text-wrap: normal;font-size:13px;font-family:'Segoe UI';">
            <div class="e-description" style="word-wrap: break-word;">
                <b>${Name}</b> was born on ${DOB.toLocaleDateString()}. Now lives at ${Address}, ${Country}. ${Name} holds a position of <b>${Designation}</b> in our WA department, (Seattle USA).
            </div>
            <div class="e-description" style="word-wrap: break-word;margin-top:5px;">
                <b style="margin-right:10px;">Contact:</b>${Contact}
            </div>
        </div>
    </script>

public IActionResult DetailTemplate()
        {
            ViewBag.datasource = TreeData.GetTemplateData();
            return View();
        }

Drag and drop

The TreeGrid rows can be reordered, dropped to another TreeGrid or custom control by enabling the allowRowDragAndDrop to true.

Drag and drop within TreeGrid

The TreeGrid row drag and drop allows you to drag and drop TreeGrid rows on the same TreeGrid using drag icon. To enable row drag and drop, set the allowRowDragAndDrop to true. It provides the way to drop the row above, below or child to the target row with respective to the target row position.

tagHelper

dragdrop.cs

<ejs-treegrid id="TreeGrid" allowRowDragAndDrop="true" allowSelection="true" dataSource="ViewBag.datasource" height="275" childMapping="Children" treeColumnIndex="1">
     <e-treegrid-selectionsettings type="Multiple"></e-treegrid-selectionsettings>
    <e-treegrid-columns>
        <e-treegrid-column field="TaskId" headerText="Task ID" textAlign="Right" width="90"></e-treegrid-column>
        <e-treegrid-column field="TaskName" headerText="Task Name" width="180"></e-treegrid-column>
        <e-treegrid-column field="StartDate" headerText=" Start Date" textAlign="Right" 
                format="yMd" width="90"></e-treegrid-column>
        <e-treegrid-column field="Duration" headerText="Duration" textAlign="Right" width="80"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>

public IActionResult Index()
{
    var tree = TreeData.GetDefaultData();
    ViewBag.datasource = tree;
    return View();
}

Selection feature must be enabled for row drag and drop.

For multiple row selection, the type property must be set to multiple.

Drag and drop to another TreeGrid

To drag and drop between two TreeGrid, enable the allowRowDragAndDrop property and specify the target TreeGrid ID in targetID property of rowDropSettings.

tagHelper

dragdrop.cs

<ejs-treegrid id="TreeGrid" allowRowDragAndDrop="true" allowSelection="true" dataSource="ViewBag.datasource" height="275" childMapping="Children" treeColumnIndex="1">
     <e-treegrid-selectionsettings type="Multiple"></e-treegrid-selectionsettings>
    <e-treegrid-rowdropsettings targetID="DestGrid"></e-treegrid-rowdropsettings>
    <e-treegrid-columns>
        <e-treegrid-column field="TaskId" headerText="Task ID" textAlign="Right" width="90"></e-treegrid-column>
        <e-treegrid-column field="TaskName" headerText="Task Name" width="180"></e-treegrid-column>
        <e-treegrid-column field="StartDate" headerText=" Start Date" textAlign="Right" 
                format="yMd" width="90"></e-treegrid-column>
        <e-treegrid-column field="Duration" headerText="Duration" textAlign="Right" width="80"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>

<ejs-treegrid id="DestGrid" allowRowDragAndDrop="true" allowSelection="true" height="275" childMapping="Children" treeColumnIndex="1">
    <e-treegrid-selectionsettings type="Multiple"></e-treegrid-selectionsettings>
    <e-treegrid-rowdropsettings targetID="DestGrid"></e-treegrid-rowdropsettings>
    <e-treegrid-columns>
        <e-treegrid-column field="TaskId" headerText="Task ID" textAlign="Right" width="90"></e-treegrid-column>
        <e-treegrid-column field="TaskName" headerText="Task Name" width="180"></e-treegrid-column>
        <e-treegrid-column field="StartDate" headerText=" Start Date" textAlign="Right" 
                format="yMd" width="90"></e-treegrid-column>
        <e-treegrid-column field="Duration" headerText="Duration" textAlign="Right" width="80"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>

public IActionResult Index()
{
    var tree = TreeData.GetDefaultData();
    ViewBag.datasource = tree;
    return View();
}

Drag and drop events

The following events are triggered while drag and drop the treegrid rows.

RowDragStartHelper - Triggers when click the drag icon or treegrid row and this event is used to customize the drag element based on user criteria.
RowDragStart -Triggers when starts to drag the treegrid row.
RowDrag - Triggers while dragging the treegrid row.
RowDrop - Triggers when a drag element is dropped on the target element.

Contents

Customize rows
Styling alternate rows
Row height
Customize row height for particular row
Row template
Row template with formatting
Limitations
Detail template
Drag and drop
Drag and drop within TreeGrid
Drag and drop to another TreeGrid
Drag and drop events

Contents

Customize rows
Styling alternate rows
Row height
Customize row height for particular row
Row template
Row template with formatting
Limitations
Detail template
Drag and drop
Drag and drop within TreeGrid
Drag and drop to another TreeGrid
Drag and drop events

Please provide additional information

Thank you for your feedback and comments.We will rectify this as soon as possible!