Readme.md

Grid View for ASP.NET MVC - Implement the Select All check box for a templated column in batch edit mode

This example demonstrates how to create a header template, add a check box to the template, and implement the Select All functionality in batch edit mode.

Overview

Follow the steps below to implement the Select All functionality in a column's header in batch edit mode:

1. Call a column's SetHeaderTemplateContent method and add a check box editor to the template.

   settings.Columns.Add(column => {
       column.FieldName = "IsReserved";
       column.ColumnType = MVCxGridViewColumnType.CheckBox;
       column.EditorProperties().CheckBox(p => {
           p.ClientSideEvents.CheckedChanged = "OnCellCheckedChanged";
           p.ValidationSettings.Display = Display.Dynamic;
       });
       column.SetHeaderTemplateContent(c => {
           ViewContext.Writer.Write("<div style='text-align:center;'>");
           Html.DevExpress().CheckBox(headerCheckBoxSettings => {
               headerCheckBoxSettings.Name = "HeaderCheckBox";
               headerCheckBoxSettings.Properties.AllowGrayed = true;
               headerCheckBoxSettings.Properties.AllowGrayedByClick = false;
               headerCheckBoxSettings.Properties.ClientSideEvents.CheckedChanged = "OnHeaderCheckBoxCheckedChanged";
               headerCheckBoxSettings.Properties.ClientSideEvents.Init = "OnInitHeader";
           }).GetHtml();
           ViewContext.Writer.Write("</div>");
       });
   });

2. Handle the editor's client-side CheckedChanged event. In the handler, call the grid's SetCellValue method to assign a value to the specified cell based on a check box state.

   function OnHeaderCheckBoxCheckedChanged(s, e) {
       var visibleIndices = Grid.batchEditApi.GetRowVisibleIndices();
       var totalRowsCountOnPage = visibleIndices.length;
       for (var i = 0; i < totalRowsCountOnPage ; i++) {
           Grid.batchEditApi.SetCellValue(visibleIndices[i], "IsReserved", s.GetChecked())
       }
   }

3. Handle the grid's client-side BatchEditEndEditing, BatchEditRowDeleting, and BatchEditRowInserting events. In the handlers, call the CheckSelectedCellsOnPage function. In this function, compare the number of selected rows and the total number of visible rows. Based on a result, specify the state of the checkbox editor.

   function CheckSelectedCellsOnPage(checkType) {
       var currentlySelectedRowsCount = 0;
       var visibleIndices = Grid.batchEditApi.GetRowVisibleIndices();
       var totalRowsCountOnPage = visibleIndices.length;
       for (var i = 0; i < totalRowsCountOnPage ; i++) {
           if (Grid.batchEditApi.GetCellValue(visibleIndices[i], "IsReserved"))
               currentlySelectedRowsCount++;
       }
       if (checkType == "insertCheck")
           totalRowsCountOnPage++;
       else if (checkType == "deleteCheck") {
           totalRowsCountOnPage--;
           if (DeletedValue)
               currentlySelectedRowsCount--;
       }
       if (currentlySelectedRowsCount <= 0)
           HeaderCheckBox.SetCheckState("Unchecked");
       else if (currentlySelectedRowsCount >= totalRowsCountOnPage)
           HeaderCheckBox.SetCheckState("Checked");
       else
           HeaderCheckBox.SetCheckState("Indeterminate");
   }

Files to Review

• GridViewPartialView.cshtml
• Index.cshtml

Documentation

• Grid View Templates
• Batch Edit Mode

More Examples

• Grid View for ASP.NET Web Forms - Implement the Select All check box for a templated column in batch edit mode

Does this example address your development requirements/objectives?

(you will be redirected to DevExpress.com to submit your response)