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Filtering in JavaScript (ES5) Gantt control

14 Apr 2021 / 11 minutes to read

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.

To use filter, inject the Filter module into the Gantt control.

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.

Source
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index.js
index.html
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ej.gantt.Gantt.Inject(ej.gantt.Filter);

var ganttChart = new ej.gantt.Gantt({
        dataSource: GanttData,
		height:'450px',
	    taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        },
		filterSettings: {
            type:'Menu'
        },
		allowFiltering: true
    });
ganttChart.appendTo('#Gantt');
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<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Gantt Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>

<body>
       
    
    <div id="container">
        <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

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.
Source
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index.js
index.html
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ej.gantt.Gantt.Inject(ej.gantt.Filter);

var ganttChart = new ej.gantt.Gantt({
        dataSource: GanttData,
		height:'450px',
		taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        },
		allowFiltering: true
    });
ganttChart.appendTo('#Gantt');

var dropDownMode = new ej.dropdowns.DropDownList({
        dataSource: [
            { id: 'Parent', mode: 'Parent' },
            { id: 'Child', mode: 'Child' },
            { id: 'Both', mode: 'Both' },
            { id: 'None', mode: 'None' },
        ],
        fields: { text: 'mode', value: 'id' },
        value: 'Parent',
        change: function (e) {
            var mode = e.value;
            ganttChart.filterSettings.hierarchyMode = mode;
            ganttChart.clearFiltering();
        }
});

dropDownMode.appendTo('#mode');
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<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Gantt Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>

<body>
       
    
    <div id="container">
        <div>
            <div style="padding-top: 7px; display: inline-block">Hierarchy Mode</div>
            <div style="display: inline-block">
               <input type="text" id="mode">
            </div>
        </div>
        <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Initial filter

To apply the filter at initial rendering, set the filter to predicate object in the filterSettings.columns property.

Source
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index.js
index.html
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ej.gantt.Gantt.Inject(ej.gantt.Filter);

var ganttChart = new ej.gantt.Gantt({
        dataSource: GanttData,
		height:'450px',
		taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        },
		filterSettings: {
            columns: [{ field: 'TaskName', matchCase: false, operator: 'startswith', predicate: 'and', value: 'Identify' },
               { field: 'TaskID', matchCase: false, operator: 'equal', predicate: 'and', value: 2 }]
        },
		allowFiltering: true
    });
ganttChart.appendTo('#Gantt');
Copied to clipboard
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Gantt Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>

<body>
       
    
    <div id="container">
        <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

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.

Source
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index.js
index.html
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ej.gantt.Gantt.Inject(ej.gantt.Filter);

var GanttData = [
    {
        TaskID: 1,
        TaskName: 'Projéct initiàtion',
        StartDate: new Date('04/02/2019'),
        EndDate: new Date('04/21/2019'),
        subtasks: [
            {TaskID: 2, TaskName: 'Identify site locàtion', StartDate: new Date('04/02/2019'), Duration: 0,Progress: 50 },
            {TaskID: 3, TaskName: 'Perförm soil test', StartDate: new Date('04/02/2019'), Duration: 4, Progress: 50 },
            {TaskID: 4, TaskName: 'Soil tëst appröval', StartDate: new Date('04/02/2019'), Duration: 0, Progress: 50 },
        ]
    },
    {
        TaskID: 5,
        TaskName: 'Project estimation',
        StartDate: new Date('04/02/2019'),
        EndDate: new Date('04/21/2019'),
        subtasks: [
            {TaskID: 6, TaskName: 'Develöp floor plan for estimàtion', StartDate: new Date('04/04/2019'),Duration: 3, Progress: 50, resources: [4]},
            {TaskID: 7, TaskName: 'List matërials', StartDate: new Date('04/04/2019'),Duration: 3, Progress: 50},
            {TaskID: 8, TaskName: 'Estimation approval', StartDate: new Date('04/04/2019'),Duration: 0, Progress: 50 }
        ]
    }];
	
var ganttChart = new ej.gantt.Gantt({
        dataSource: GanttData,
		height:'450px',
		taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        },
		filterSettings: {
           ignoreAccent:true
        },
		allowFiltering: true
    });
ganttChart.appendTo('#Gantt');
Copied to clipboard
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Gantt Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
       
    
    <div id="container">
        <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Filtering a specific column by method

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

Source
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index.js
index.html
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ej.gantt.Gantt.Inject(ej.gantt.Filter);

var ganttChart = new ej.gantt.Gantt({
         dataSource: GanttData,
		 height:'450px',
		 taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        },
		allowFiltering:true
});
ganttChart.appendTo('#Gantt');

var filterBtn= new ej.buttons.Button();
filterBtn.appendTo('#filter');

document.getElementById('filter').addEventListener('click', function() {
    ganttChart.filterByColumn('TaskName','startswith','Iden');
});
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<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Gantt Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>

<body>
       
    
    <div id="container">
	                  
        <button id="filter">Filter TaskName column</button>       
        <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

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 behavior.

Source
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index.js
index.html
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ej.gantt.Gantt.Inject(ej.gantt.Filter);

var ganttChart = new ej.gantt.Gantt({
         dataSource: GanttData,
		 height:'450px',
		 taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        },
		allowFiltering: true,
		filterSettings: {
            columns: [{ field: 'TaskName', matchCase: false, operator: 'startswith', predicate: 'and', value: 'Identify' },
               { field: 'Progress', matchCase: false, operator: 'equal', predicate: 'and', value: 50 }]
        }
});
ganttChart.appendTo('#Gantt');

var filterBtn= new ej.buttons.Button();
filterBtn.appendTo('#clearFilter');

document.getElementById('clearFilter').addEventListener('click', function() {
    ganttChart.clearFiltering();
});
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<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Gantt Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>

<body>
       
    
    <div id="container">
	     <button id="clearFilter">Clear Filter</button>
         <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Custom component in filter menu

The column.filter.ui is used to add custom filter components to a particular column. To implement custom filter ui, define the following functions:

  • create: Creates custom component.
  • write: Wire events for custom component.
  • read: Read the filter value from custom component.

In the following sample, dropdown is used as custom component in the TaskName column.

Source
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index.js
index.html
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ej.gantt.Gantt.Inject(ej.gantt.Filter);

var ganttChart = new ej.gantt.Gantt({
    dataSource: GanttData,
    height: '450px',
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        child: 'subtasks'
    },
     columns: [
            { field: 'TaskID' },
            { field: 'TaskName', filter: {
                ui: {
                    create: function(args){
                        var db = new ej.data.DataManager(ganttChart.treeGrid.grid.dataSource);
                        var flValInput = ej.base.createElement('input', { className: 'flm-input' });
                        args.target.appendChild(flValInput);
                        this.dropInstance = new ej.dropdowns.DropDownList({
                            dataSource: new ej.data.DataManager(ganttChart.treeGrid.grid.dataSource),
                            fields: { text: 'TaskName', value: 'TaskName' },
                            placeholder: 'Select a value',
                            popupHeight: '200px'
                        });
                        this.dropInstance.appendTo(flValInput);
                    },
                    write: function(args){
                        this.dropInstance.value = args.filteredValue;
                    },
                    read: function(args) {
                        args.fltrObj.filterByColumn(args.column.field, args.operator, this.dropInstance.value);
                    }
                }
                }
            },
            { field: 'StartDate' },
            { field: 'Duration' }
        ],
    allowFiltering: true
    });
ganttChart.appendTo('#Gantt');
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<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Gantt Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>

<body>
       
    
    <div id="container">
        <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

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.

To search records, inject the Filter module into the Gantt control.

Source
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index.js
index.html
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ej.gantt.Gantt.Inject(ej.gantt.Filter, ej.gantt.Toolbar);

var ganttChart = new ej.gantt.Gantt({
         dataSource: GanttData,
		 height:'450px',
		 taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        },
		toolbar: ['Search']
    });
ganttChart.appendTo('#Gantt');
Copied to clipboard
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Gantt Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>

<body>
       
    
    <div id="container">
        <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

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.

Source
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index.js
index.html
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ej.gantt.Gantt.Inject(ej.gantt.Filter, ej.gantt.Toolbar);

var ganttChart = new ej.gantt.Gantt({
         dataSource: GanttData,
		 height:'450px',
		 taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        },
		toolbar: ['Search'],
		searchSettings: { fields: ['TaskName'], operator: 'contains', key: 'List', ignoreCase: true }
});
ganttChart.appendTo('#Gantt');
Copied to clipboard
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Gantt Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>

<body>
       
    
    <div id="container">
        <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

By default, Gantt searches all the bound column values. To customize this behavior, 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.

Source
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index.js
index.html
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ej.gantt.Gantt.Inject(ej.gantt.Filter, ej.gantt.Toolbar);

var ganttChart = new ej.gantt.Gantt({
         dataSource: GanttData,
		 height:'450px',
		 taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        },
		allowFiltering:true
});
ganttChart.appendTo('#Gantt');

var searchBtn= new ej.buttons.Button();
searchBtn.appendTo('#search');

document.getElementById('search').addEventListener('click', function() {
    var searchText = document.getElementsByClassName('searchtext')[0].value;
    ganttChart.search(searchText);
});
Copied to clipboard
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Gantt Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>

<body>
       
    
    <div id="container">
	     <div class="e-float-input" style="width: 200px; display: inline-block;">
            <input type="text" class="searchtext">
            <span class="e-float-line"></span>
            <label class="e-float-text">Search text</label>
         </div>                   
        <button id="search">Search</button>       
        <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Note: You should set the allowFiltering property to true for searching the content externally.

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.

Source
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index.js
index.html
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ej.gantt.Gantt.Inject(ej.gantt.Filter, ej.gantt.Toolbar);

var ganttChart = new ej.gantt.Gantt({
         dataSource: GanttData,
		 height:'450px',
		 columns: [
            { field: 'TaskID', headerText: 'Task ID', textAlign: 'Left', width: '100' },
            { field: 'TaskName', headerText: 'Task Name', width: '200' },
            { field: 'StartDate', headerText: 'Start Date', width: '150' },
            { field: 'Duration', headerText: 'Duration', width: '150' },
            { field: 'Progress', headerText: 'Progress', width: '150' },
        ],
		taskFields: {
            id: 'TaskID',
            name: 'TaskName',
            startDate: 'StartDate',
            duration: 'Duration',
            progress: 'Progress',
            child: 'subtasks'
        },
		toolbar: ['Search'],
		searchSettings: { fields: ['TaskName', 'Duration']}
		 
     });
ganttChart.appendTo('#Gantt');
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<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Gantt Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>

<body>
       
    
    <div id="container">
        <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

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

Clear search by external button

You can set searchSettings.key property as empty string, to clear the searched Gantt records from external button.

Source
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index.js
index.html
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ej.gantt.Gantt.Inject(ej.gantt.Filter, ej.gantt.Toolbar);

var ganttChart = new ej.gantt.Gantt({
    dataSource: GanttData,
    height: '450px',
    columns: [
        { field: 'TaskID', headerText: 'Task ID', textAlign: 'Left', width: '100' },
        { field: 'TaskName', headerText: 'Task Name', width: '250' },
        { field: 'StartDate', headerText: 'Start Date', width: '150' },
        { field: 'Duration', headerText: 'Duration', width: '150' },
        { field: 'Progress', headerText: 'Progress', width: '150' },
    ],
    taskFields: {
        id: 'TaskID',
        name: 'TaskName',
        startDate: 'StartDate',
        duration: 'Duration',
        progress: 'Progress',
        child: 'subtasks'
    },
    toolbar: ['Search'],
    searchSettings: { fields: ['TaskName'], operator: 'contains', key: 'Perform', ignoreCase: true },
});
ganttChart.appendTo('#Gantt');

var clearBtn= new ej.buttons.Button();
clearBtn.appendTo('#changeByPosition');

document.getElementById('clear').addEventListener('click', function() {
   ganttChart.searchSettings.key='';
});
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<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Gantt</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Gantt Controls">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
	<link href="https://cdn.syncfusion.com/ej2/material.css" rel="stylesheet" type="text/css">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>

<body>
       
    
    <div id="container">
        <button id="clear">Clear Search</button>    
        <div id="Gantt"></div>        
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>
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