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Filtering in ASP.NET Core Gantt control

Filtering allows you to view specific or related records based on filter criteria. This can be done in the Gantt control by using the filter menu support and toolbar search support. To enable filtering in the Gantt control, set the AllowFiltering to true. Menu filtering support can be configured using the FilterSettings property and toolbar searching can be configured using the SearchSettings property.

The Gantt control provides the menu filtering support for each column. You can enable the filter menu by setting the AllowFiltering to true. The filter menu UI will be rendered based on its column type, which allows you to filter data. You can filter the records with different operators.

tagHelper
enablefilter.cs
<ejs-gantt id='Gantt' dataSource="ViewBag.dataSource" height="450px" allowFiltering="true">
        <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate"
            endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks">
        </e-gantt-taskfields>
</ejs-gantt>
public IActionResult Index()
{
    ViewBag.DataSource = GanttData.ProjectNewData();
    return View();
}

The AllowFiltering property should be set to true to enable the filter menu. Setting the Columns.AllowFiltering property to false prevents rendering filter menu for a particular column.

Filter hierarchy modes

The Gantt supports a set of filtering modes with the FilterSettings.HierarchyMode property. The following are the types of filter hierarchy modes available in the Gantt control:

  • Parent: This is the default filter hierarchy mode in Gantt. The filtered records are displayed with its parent records. If the filtered records do not have any parent record, then only the filtered records will be displayed.
  • Child: Displays the filtered records with its child record. If the filtered records do not have any child record, then only the filtered records will be displayed.
  • Both: Displays the filtered records with its both parent and child records. If the filtered records do not have any parent and child records, then only the filtered records will be displayed.
  • None: Displays only the filtered records.
tagHelper
filterHierarchyMode.cs
<ejs-dropdownlist id="mode" dataSource="@ViewBag.dropdata" width="250px" placeholder="Select a Mode" change="onModeChange" index="0" popupHeight="220px">
        <e-dropdownlist-fields text="mode" value="id"></e-dropdownlist-fields>
  </ejs-dropdownlist>
  
    <ejs-gantt id='Gantt' dataSource="ViewBag.dataSource" height="450px" allowFiltering="true">
        <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate"
            endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks">
        </e-gantt-taskfields>
    </ejs-gantt>
	
	 <script>
        function onModeChange(e) {
            var ganttObj = document.getElementById("Gantt").ej2_instances[0];
            var mode = e.value;
            ganttObj.filterSettings.hierarchyMode = mode;
            ganttObj.clearFiltering();
        }
    </script>
public IActionResult Index()
{
    ViewBag.DataSource = GanttData.ProjectNewData();
	ViewBag.dropdata = new List<object>() {
        new { id= "Parent", mode= "Parent" },
        new { id= "Child", mode= "Child" },
        new { id= "Both", mode= "Both" },
        new { id= "None", mode= "None" },
    };
    return View();
}

Initial filter

To apply the filter at initial rendering, set the filter to predicate object in the FilterSettings.Columns property.

tagHelper
initialFilter.cs
@{
    List<object> filterColumns = new List<object>();
        filterColumns.Add(new { field = "TaskName", matchCase = false, @operator = "startswith", predicate = "and", value = "Identify" });
        filterColumns.Add(new { field = "TaskId", matchCase = false, @operator = "equal", predicate = "and", value = 2 });
  }
               
    <ejs-gantt id='Gantt' dataSource="ViewBag.dataSource" height="450px" allowFiltering="true">
        <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate"
                endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks">
        </e-gantt-taskfields>
        <e-gantt-filterSettings columns="filterColumns"></e-gantt-filterSettings>
    </ejs-gantt>
public IActionResult Index()
{
    ViewBag.DataSource = GanttData.ProjectNewData();
    return View();
}

Filter operators

The filter operator for a column can be defined in the FilterSettings.Columns.Operator property.

The available operators and its supported data types are:

Operator Description Supported Types
startswith Checks whether the value begins with the specified value. String
endswith Checks whether the value ends with the specified value. String
contains Checks whether the value contains the specified value. String
equal Checks whether the value is equal to the specified value. String | Number | Boolean | Date
notequal Checks for the values that are not equal to the specified value. String | Number | Boolean | Date
greaterthan Checks whether the value is greater than the specified value. Number | Date
greaterthanorequal Checks whether the value is greater than or equal to the specified value. Number | Date
lessthan Checks whether the value is less than the specified value. Number | Date
lessthanorequal Checks whether the value is less than or equal to the specified value. Number | Date

By default, the FilterSettings.Columns.Operator value is equal

Diacritics

By default, the Gantt control ignores the diacritic characters while filtering. To include diacritic characters, set the FilterSettings.IgnoreAccent to true.

In the following sample, type Perform in the TaskName column to filter diacritic characters.

tagHelper
diacriticsFilter.cs
<ejs-gantt id='Gantt' dataSource="ViewBag.dataSource" height="450px" allowFiltering="true">
    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate"
        endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks">
    </e-gantt-taskfields>
    <e-gantt-filterSettings ignoreAccent="true"></e-gantt-filterSettings>
</ejs-gantt>
public IActionResult Index()
{
    ViewBag.DataSource = ganttData();
    return View();
}
public static List<GanttDataSource> ganttData()
        {
            List<GanttDataSource> GanttDataSourceCollection = new List<GanttDataSource>();

            GanttDataSource Record1 = new GanttDataSource()
            {
                TaskId = 1,
                TaskName = "Project initiation",
                StartDate = new DateTime(2019, 04, 02),
                EndDate = new DateTime(2019, 04, 21),
                SubTasks = new List<GanttDataSource>(),
            };
            GanttDataSource Child1 = new GanttDataSource()
            {
                TaskId = 2,
                TaskName = "Identify site locàtion",
                StartDate = new DateTime(2019, 04, 02),
                Duration = 4,
                Progress = 50,
                ResourceId = new int[] { 1 },
            };
            GanttDataSource Child2 = new GanttDataSource()
            {
                TaskId = 3,
                TaskName = "Perförm soil test",
                StartDate = new DateTime(2019, 04, 02),
                Duration = 4,
                Progress = 50,
                ResourceId = new int[] { 2, 3, 5 },
            };
            GanttDataSource Child3 = new GanttDataSource()
            {
                TaskId = 4,
                TaskName = "Soil tëst appröval",
                StartDate = new DateTime(2019, 04, 02),
                Duration = 4,
                Progress = 50,
            };
            Record1.SubTasks.Add(Child1);
            Record1.SubTasks.Add(Child2);
            Record1.SubTasks.Add(Child3);

            GanttDataSource Record2 = new GanttDataSource()
            {
                TaskId = 5,
                TaskName = "Project estimation",
                StartDate = new DateTime(2019, 04, 02),
                EndDate = new DateTime(2019, 04, 21),
                SubTasks = new List<GanttDataSource>(),
            };
            GanttDataSource Child4 = new GanttDataSource()
            {
                TaskId = 6,
                TaskName = "Develop floor plan for estimation",
                StartDate = new DateTime(2019, 04, 04),
                Duration = 3,
                Progress = 50,
                ResourceId = new int[] { 4 },
                
            };
            GanttDataSource Child5 = new GanttDataSource()
            {
                TaskId = 7,
                TaskName = "List materials",
                StartDate = new DateTime(2019, 04, 04),
                Duration = 3,
                Progress = 50,
                ResourceId = new int[] { 4, 8 },
           
            };
            Record2.SubTasks.Add(Child4);
            Record2.SubTasks.Add(Child5);

            GanttDataSourceCollection.Add(Record1);
            GanttDataSourceCollection.Add(Record2);

            return GanttDataSourceCollection;
        } 
		
		 public class GanttDataSource
        {
            public int TaskId { get; set; }
            public string TaskName { get; set; }
            public DateTime StartDate { get; set; }
            public DateTime EndDate { get; set; }
            public int? Duration { get; set; }
            public int Progress { get; set; }
            public List<GanttDataSource> SubTasks { get; set; }
            public int[] ResourceId { get; set; }
            
        }

Filtering a specific column by method

You can filter the columns dynamically by using the filterByColumn method.

tagHelper
filterByColumn.cs
<ejs-button id="filter" content="Filter TaskName column" cssClass="e-primary"></ejs-button>
    <ejs-gantt id='Gantt' dataSource="ViewBag.dataSource" height="450px" allowFiltering="true">
            <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate"
                endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks">
            </e-gantt-taskfields>
    </ejs-gantt>
	
	 <script>
        document.getElementById('filter').addEventListener('click', function (args) {
           var ganttObj = document.getElementById('Gantt').ej2_instances[0];
            ganttObj.filterByColumn('TaskName', 'startswith', 'Iden');
        });
    </script>
public IActionResult Index()
{
    ViewBag.DataSource = GanttData.ProjectNewData();
    return View();
}

Clear filtered columns

You can clear all the filtering condition done in the Gantt control by using the clearFiltering method. The following code snippet explains the above behaviour.

tagHelper
clearFilter.cs
<ejs-button id="clearFilter" content="Clear Filter" cssClass="e-primary"></ejs-button>
        <ejs-gantt id='Gantt' dataSource="ViewBag.dataSource" height="450px" allowFiltering="true">
            <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate"
                endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks">
            </e-gantt-taskfields>
        </ejs-gantt> 
		
    <script>
        document.getElementById('clearFilter').addEventListener('click', function (args) {
           var ganttObj = document.getElementById('Gantt').ej2_instances[0];
            ganttObj.clearFiltering();
        });
    </script>
public IActionResult Index()
{
    ViewBag.DataSource = GanttData.ProjectNewData();
    return View();
}

You can search records in the Gantt control by using the search method with search key as a parameter. The Gantt control provides an option to integrate the search text box in the toolbar by adding the search item to the Toolbar property.

tagHelper
Searching.cs
<ejs-gantt id='Gantt' dataSource="ViewBag.dataSource" height="450px" toolbar="@(new List<string>() { "Search" })">
                    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate"
                         endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks">
                    </e-gantt-taskfields>
                    
                </ejs-gantt>
public IActionResult Index()
{
    ViewBag.DataSource = GanttData.ProjectNewData();
    return View();
}

The following screenshot shows the output of searching for string in Gantt control.

Alt text

In the Gantt control, you can load a task with some search criteria and this can be done by using the SearchSettings property. To apply search at initial rendering, set the value for Fields, Operator, Key, and IgnoreCase in the SearchSettings property.

tagHelper
initialLoadSearch.cs
<ejs-gantt id='Gantt' dataSource="ViewBag.dataSource" height="450px" toolbar="@(new List<string>() { "Search" })">
                    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate"
                         endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks">
                    </e-gantt-taskfields>
                    <e-gantt-searchsettings fields="@(new string[] { "TaskName"})" operator="contains" key="List" ignoreCase="true"></e-gantt-searchsettings>
                </ejs-gantt>
public IActionResult Index()
{
    ViewBag.DataSource = GanttData.ProjectNewData();
    return View();
}

Alt text

By default, Gantt searches all the bound column values. To customize this behaviour, define the SearchSettings.Fields property.

Search operators

The search operator can be defined in the SearchSettings.Operator property to configure specific searching.

The following operators are supported in searching:

Operator Description
startsWith Checks whether a value begins with the specified value.
endsWith Checks whether a value ends with the specified value.
contains Checks whether a value contains the specified value.
equal Checks whether a value is equal to the specified value.
notEqual Checks for the values that are not equal to the specified value.

By default, the SearchSettings.Operator value is contains.

Search by external button

To search the Gantt records from an external button, invoke the search method.

tagHelper
externalSearch.cs
<input type="text" id="searchText">
  <ejs-button id="Search" content="Search Gantt" cssClass="e-primary"></ejs-button>
 <ejs-gantt id='Gantt' dataSource="ViewBag.dataSource" height="450px">
                    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate"
                           endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks">
                    </e-gantt-taskfields>

                </ejs-gantt>
				
	<script>
        document.getElementById('Search').addEventListener('click', function (args) {
            var val = document.getElementById('searchText').value;
            var ganttObj = document.getElementById('Gantt').ej2_instances[0];
            ganttObj.search(val);
        });
    </script>
public IActionResult Index()
{
    ViewBag.DataSource = GanttData.ProjectNewData();
    return View();
}

Search specific columns

By default, the Gantt control searches all the columns. You can search specific columns by defining the specific column’s field names in the SearchSettings.Fields property.

tagHelper
specificColumnSearch.cs
<ejs-gantt id='Gantt' dataSource="ViewBag.dataSource" height="450px" toolbar="@(new List<string>() { "Search"})">
                    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate"
                           endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks">
                    </e-gantt-taskfields>
                    <e-gantt-searchSettings fields="@(new string[] { "TaskName", "Duration"})"></e-gantt-searchSettings>
                </ejs-gantt>
public IActionResult Index()
{
    ViewBag.DataSource = GanttData.ProjectNewData();
    return View();
}

In above sample, you can search only TaskName and Duration column values.