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Legend in ASP.NET Core TreeMap control

05 May 2021 / 4 minutes to read

Legend is used to provide valuable information for interpreting what the tree map is displaying and can be represented in various colors, shapes or other identifiers based on data.

Position and alignment

Legend position is used to place legend in various positions. Based on the legend position, the legend item will be aligned. For example, if the position is top or bottom, the legend items are placed by rows. If the position is left or right, the legend items are placed by columns.

The following options are available to customize the legend position:

Top
Bottom
Left
Right
Float

The following code example shows the legend position.

tagHelper

position.cs

@{ 
   var colorMaps = new[]{
               new { from=500, to=3000, color='orange' },
			   new { from=3000, to=5000, color='green' }
            };
}
@using Syncfusion.EJ2;
<div id="container">
    <ejs-treemap id="container" load="load" height="350px" weightValuePath="count" rangeColorValuePath="count">
            <e-treemap-leafitemsettings labelPath="fruit" colorMapping="colorMaps"></e-treemap-leafitemsettings>
			 <e-treemap-legendsettings visible= "true" position="@Syncfusion.EJ2.TreeMap.LegendPosition.Top" ></e-treemap-legendsettings>
    </ejs-treemap>
</div>         
<script>
    function load(args)
    { 
        var data = [{ fruit:'Apple', count:5000 },
                       { fruit:'Mango', count:3000 },
                       { fruit:'Orange', count:2300 },
                       { fruit:'Banana', count:500 },
                       { fruit:'Grape', count:4300 },
                       { fruit:'Papaya', count:1200 },
                       { fruit:'Melon', count:4500 }
        ];
        args.treemap.dataSource = data;
    }
</script>

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Legend Alignment is used to align the legend items in specific location. The following options are available to customize the legend alignment:

Near
Center
Far

The following code example shows legend alignment.

tagHelper

align.cs

@{ 
   var colorMaps = new[]{
               new { from=500, to=3000, color='orange' },
			   new { from=3000, to=5000, color='green' }
            };
}
@using Syncfusion.EJ2;
<div id="container">
    <ejs-treemap id="container" load="load" height="350px" weightValuePath="count" rangeColorValuePath="count">
            <e-treemap-leafitemsettings labelPath="fruit" colorMapping="colorMaps"></e-treemap-leafitemsettings>
			 <e-treemap-legendsettings visible= "true" alignment='Far'></e-treemap-legendsettings>
    </ejs-treemap>
</div>         
<script>
    function load(args)
    { 
        var data = [{ fruit:'Apple', count:5000 },
                       { fruit:'Mango', count:3000 },
                       { fruit:'Orange', count:2300 },
                       { fruit:'Banana', count:500 },
                       { fruit:'Grape', count:4300 },
                       { fruit:'Papaya', count:1200 },
                       { fruit:'Melon', count:4500 }
        ];
        args.treemap.dataSource = data;
    }
</script>

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Legend mode

The tree map control supports two different types of legend rendering modes such as Default and Interactive.

Default mode

In default mode, legends have symbols with legend labels that are used to identify the items in tree map control.

The following code example shows the default mode of legends.

tagHelper

default.cs

@{ 
   var colorMaps = new[]{
               new { value='Ford', color='green'},
			    new { value='Audi', color='red'},
				new { value='Maruti', color='orange'},
            };
			var border= new TreeMapBorder{color='black',width=2}
}
@using Syncfusion.EJ2;
<div id="container">
    <ejs-treemap id="container" load="load" height="350px" weightValuePath="count" equalColorValuePath='Brand',>
            <e-treemap-leafitemsettings labelPath="Car" colorMapping="colorMaps"></e-treemap-leafitemsettings>
			 <e-treemap-legendsettings visible= "true" position="@Syncfusion.EJ2.TreeMap.LegendPosition.Top" border='border'></e-treemap-legendsettings>
    </ejs-treemap>
</div>         
<script>
    function load(args)
    { 
        var data = [{ Car:'Mustang', Brand:'Ford', count:232 },
                       { Car:'EcoSport', Brand:'Ford', count:121 },
                       { Car:'Swift', Brand:'Maruti', count:143 },
                       { Car:'Baleno', Brand:'Maruti', count:454 },
                       { Car:'Vitara Brezza', Brand:'Maruti', count:545 },
                       { Car:'A3 Cabriolet', Brand:'Audi',count:123 },
                       { car:'RS7 Sportback', Brand:'Audi', count:523 }
        ];
        args.treemap.dataSource = data;
    }
</script>

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Interactive mode

The legends can be made interactive with an arrow mark that indicates exact range color in legend when the mouse hovers over the corresponding shape. You can enable this option by setting the mode property in legendSettings value to “Interactive”. The default value of the mode property is “Default” to enable normal legend.

The following code example shows the interactive mode of legends.

tagHelper

interactive.cs

@{ 
   var colorMaps = new[]{
               new { value='Ford', color='green'},
			    new { value='Audi', color='red'},
				new { value='Maruti', color='orange'},
            };
			var border= new TreeMapBorder{color='black',width=2}
}
@using Syncfusion.EJ2;
<div id="container">
    <ejs-treemap id="container" load="load" height="350px" weightValuePath="count" equalColorValuePath='Brand',>
            <e-treemap-leafitemsettings labelPath="Car" colorMapping="colorMaps"></e-treemap-leafitemsettings>
			 <e-treemap-legendsettings visible= "true" position="@Syncfusion.EJ2.TreeMap.LegendPosition.Top" mode="@LegendMode.Interactive" border='border'></e-treemap-legendsettings>
    </ejs-treemap>
</div>         
<script>
    function load(args)
    { 
        var data = [{ Car:'Mustang', Brand:'Ford', count:232 },
                       { Car:'EcoSport', Brand:'Ford', count:121 },
                       { Car:'Swift', Brand:'Maruti', count:143 },
                       { Car:'Baleno', Brand:'Maruti', count:454 },
                       { Car:'Vitara Brezza', Brand:'Maruti', count:545 },
                       { Car:'A3 Cabriolet', Brand:'Audi',count:123 },
                       { car:'RS7 Sportback', Brand:'Audi', count:523 }
        ];
        args.treemap.dataSource = data;
    }
</script>

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Legend size

You can customize the legend size by modifying the [height] and [width] properties in the legendSettings. It accepts values in both percentage and pixel. If the value is specified in percentage for height or width, the legend height will be calculated for overall height.

Legend size is shown in the following example.

tagHelper

size.cs

@{ 
   var colorMaps = new[]{
               new { value='Ford', color='green'},
			    new { value='Audi', color='red'},
				new { value='Maruti', color='orange'},
            };
			var border= new TreeMapBorder{color='black',width=2}
}
@using Syncfusion.EJ2;
<div id="container">
    <ejs-treemap id="container" load="load" height="350px" weightValuePath="count" equalColorValuePath='Brand',>
            <e-treemap-leafitemsettings labelPath="Car" colorMapping="colorMaps"></e-treemap-leafitemsettings>
			 <e-treemap-legendsettings visible= "true" position="@Syncfusion.EJ2.TreeMap.LegendPosition.Top" width:'200px' height:'50px' border='border'></e-treemap-legendsettings>
    </ejs-treemap>
</div>         
<script>
    function load(args)
    { 
        var data = [{ Car:'Mustang', Brand:'Ford', count:232 },
                       { Car:'EcoSport', Brand:'Ford', count:121 },
                       { Car:'Swift', Brand:'Maruti', count:143 },
                       { Car:'Baleno', Brand:'Maruti', count:454 },
                       { Car:'Vitara Brezza', Brand:'Maruti', count:545 },
                       { Car:'A3 Cabriolet', Brand:'Audi',count:123 },
                       { car:'RS7 Sportback', Brand:'Audi', count:523 }
        ];
        args.treemap.dataSource = data;
    }
</script>

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Paging support

The tree map supports the legend paging. Legend paging will be enabled if the legend items cannot placed within provided height and width.

The following code example shows enabling legend paging.

tagHelper

paging.cs

@{ 
   var colorMaps = new[]{
               new { value='Ford', color='green'},
			    new { value='Audi', color='red'},
				new { value='Maruti', color='orange'},
            };
			var border= new TreeMapBorder{color='black',width=2}
}
@using Syncfusion.EJ2;
<div id="container">
    <ejs-treemap id="container" load="load" height="350px" weightValuePath="count" equalColorValuePath='Brand',>
            <e-treemap-leafitemsettings labelPath="Car" colorMapping="colorMaps"></e-treemap-leafitemsettings>
			 <e-treemap-legendsettings visible= "true" width:'100px' height:'50px' border='border'></e-treemap-legendsettings>
    </ejs-treemap>
</div>         
<script>
    function load(args)
    { 
        var data = [{ Car:'Mustang', Brand:'Ford', count:232 },
                       { Car:'EcoSport', Brand:'Ford', count:121 },
                       { Car:'Swift', Brand:'Maruti', count:143 },
                       { Car:'Baleno', Brand:'Maruti', count:454 },
                       { Car:'Vitara Brezza', Brand:'Maruti', count:545 },
                       { Car:'A3 Cabriolet', Brand:'Audi',count:123 },
                       { car:'RS7 Sportback', Brand:'Audi', count:523 }
        ];
        args.treemap.dataSource = data;
    }
</script>

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Legend for items excluded from color mapping

Based on the ranges in the data source, get the excluded ranges from color mapping, and then show the legend with excluded range values are bound to the specific legend.

tagHelper

excludelegend.cs

@{ 
   var colorMaps = new[]{
               new { from=500, to=2500, color='orange' },
			   new { from=3000, to=4000, color='green' }
               new { color='violet' }
            };
}
@using Syncfusion.EJ2;
<div id="container">
    <ejs-treemap id="container" load="load" height="350px" weightValuePath="count" colorValuePath="count">
            <e-treemap-leafitemsettings labelPath="fruit" colorMapping="colorMaps"></e-treemap-leafitemsettings>
			 <e-treemap-legendsettings visible= "true" position="@Syncfusion.EJ2.TreeMap.LegendPosition.Top" ></e-treemap-legendsettings>
    </ejs-treemap>
</div>         
<script>
    function load(args)
    { 
        var data = [{ fruit:'Apple', count:5000 },
                       { fruit:'Mango', count:3000 },
                       { fruit:'Orange', count:2300 },
                       { fruit:'Banana', count:500 },
                       { fruit:'Grape', count:4300 },
                       { fruit:'Papaya', count:1200 },
                       { fruit:'Melon', count:4500 }
        ];
        args.treemap.dataSource = data;
    }
</script>

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Hide desired legend items

To enable or disable the desired legend for each colormapping,set the showLegend property to true in colorMapping.

tagHelper

hidelegend.cs

@{ 
   var colorMaps = new[]{
               new { from=500, to=3000, color='orange' },
			   new { from=3000, to=5000, color='green' }
            };
}
@using Syncfusion.EJ2;
<div id="container">
    <ejs-treemap id="container" load="load" height="350px" weightValuePath="count" rangeColorValuePath="count">
            <e-treemap-leafitemsettings labelPath="fruit" colorMapping="colorMaps"></e-treemap-leafitemsettings>
			 <e-treemap-legendsettings visible= "true" position="@Syncfusion.EJ2.TreeMap.LegendPosition.Top" ></e-treemap-legendsettings>
    </ejs-treemap>
</div>         
<script>
    function load(args)
    { 
        var data = [{ fruit:'Apple', count:5000 },
                       { fruit:'Mango', count:3000 },
                       { fruit:'Orange', count:2300 },
                       { fruit:'Banana', count:500 },
                       { fruit:'Grape', count:4300 },
                       { fruit:'Papaya', count:1200 },
                       { fruit:'Melon', count:4500 }
        ];
        args.treemap.dataSource = data;
    }
</script>

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Hide legend items based data source value

To enable or disable the legend visibility for each item, bind the field name in the data source to the showLegendPath property in legendSettings.

tagHelper

hidelegendbasedDS.cs

@{ 
   var colorMaps = new[]{
               new { from=500, to=3000, color='orange' },
			   new { from=3000, to=5000, color='green' }
            };
}
@using Syncfusion.EJ2;
<div id="container">
    <ejs-treemap id="container" load="load" height="350px" weightValuePath="count" rangeColorValuePath="count">
            <e-treemap-leafitemsettings labelPath="fruit" colorMapping="colorMaps"></e-treemap-leafitemsettings>
			 <e-treemap-legendsettings visible= "true" position="@Syncfusion.EJ2.TreeMap.LegendPosition.Top" ></e-treemap-legendsettings>
    </ejs-treemap>
</div>         
<script>
    function load(args)
    { 
        var data = [{ fruit: 'Apple', count: 5000 , color: 'red', visibility: true },
            { fruit: 'Mango', count: 3000, color: 'blue' , visibility: true},
            { fruit: 'Orange', count: 2300,color: 'green' , visibility: false},
            { fruit: 'Mango', count: 500, color: 'pink' , visibility: true },
            { fruit: 'Apple', count: 4300, color: 'yellow' , visibility: false },
            { fruit: 'Papaya', count: 1200 color: 'orange', visibility: true},
            { fruit: 'Melon', count: 4500, color: 'violet', visibility: false }
        ];
        args.treemap.dataSource = data;
        args.treemap.colorValuePath = color;
        args.treemap.LegendSettings.visible = true;
        args.treemap.LegendSettings.showLegendPath = visibility; 
        args.treemap.palette = [];              
    }
</script>

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Bind legend item text from data source

To show the legend text based on binding, the field name in the datasource should be set to the valuePath property in legendSettings.

tagHelper

bindlegendtext.cs

@{ 
   var colorMaps = new[]{
               new { from=500, to=3000, color='orange' },
			   new { from=3000, to=5000, color='green' }
            };
}
@using Syncfusion.EJ2;
<div id="container">
    <ejs-treemap id="container" load="load" height="350px" weightValuePath="count" rangeColorValuePath="count">
            <e-treemap-leafitemsettings labelPath="fruit" colorMapping="colorMaps"></e-treemap-leafitemsettings>
			 <e-treemap-legendsettings visible= "true" position="@Syncfusion.EJ2.TreeMap.LegendPosition.Top" ></e-treemap-legendsettings>
    </ejs-treemap>
</div>         
<script>
    function load(args)
    { 
        var data = [{ fruit: 'Apple', count: 5000 , color: 'red' },
            { fruit: 'Mango', count: 3000, color: 'blue' },
            { fruit: 'Orange', count: 2300,color: 'green'},
            { fruit: 'Banana', count: 500, color: 'pink' },
            { fruit: 'Grape', count: 4300, color: 'yellow' },
            { fruit: 'Papaya', count: 1200 color: 'orange'},
            { fruit: 'Melon', count: 4500, color: 'violet' }
        ];
        args.treemap.dataSource = data;
        args.treemap.colorValuePath = color;
        args.treemap.LegendSettings.visible = true;
        args.treemap.LegendSettings.valuePath = fruit;
        args.treemap.palette = [];
    }
</script>

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Hide duplicate legend items

To enable or disable the duplicate legend items, set the removeDuplicateLegend property to true in legendSettings.

tagHelper

duplicatelegend.cs

@{ 
   var colorMaps = new[]{
               new { from=500, to=3000, color='orange' },
			   new { from=3000, to=5000, color='green' }
            };
}
@using Syncfusion.EJ2;
<div id="container">
    <ejs-treemap id="container" load="load" height="350px" weightValuePath="count" rangeColorValuePath="count">
            <e-treemap-leafitemsettings labelPath="fruit" colorMapping="colorMaps"></e-treemap-leafitemsettings>
			 <e-treemap-legendsettings visible= "true" position="@Syncfusion.EJ2.TreeMap.LegendPosition.Top" ></e-treemap-legendsettings>
    </ejs-treemap>
</div>         
<script>
    function load(args)
    { 
        var data = [{ fruit: 'Apple', count: 5000 , color: 'red' },
            { fruit: 'Mango', count: 3000, color: 'blue' },
            { fruit: 'Orange', count: 2300,color: 'green'},
            { fruit: 'Mango', count: 500, color: 'pink' },
            { fruit: 'Apple', count: 4300, color: 'yellow' },
            { fruit: 'Papaya', count: 1200 color: 'orange'},
            { fruit: 'Melon', count: 4500, color: 'violet' }
        ];
        args.treemap.dataSource = data;
        args.treemap.colorValuePath = color;
        args.treemap.LegendSettings.visible = true;
        args.treemap.LegendSettings.valuePath = fruit;
        args.treemap.LegendSettings.removeDuplicateLegend = true;
        args.treemap.palette = [];
    }
</script>

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Legend Responsiveness

Use a responsive legend that switches positions between the right and bottom based on the available height and width. To enable the responsive legend, set the position property to auto in the legendSettings API, and the legend position is changed based on available height and width.

In the following sample, the responsive legend is shown.

tagHelper

legend-responsive.cs

@{ 
  var size= new TreeMapSize{
      width= 700,
      height= 500
}
}
@using Syncfusion.EJ2;
<div id="container">
    <ejs-treemap id="container" load="load" height="350px" size= "size" weightValuePath="count" >
            <e-treemap-leafitemsettings labelPath="fruit" ></e-treemap-leafitemsettings>
			 <e-treemap-legendsettings visible= "true" position = "Top" ></e-treemap-legendsettings>
    </ejs-treemap>
</div>         
<script>
    function load(args)
    { 
        var data = [{ fruit:'Apple', count:5000 },
                       { fruit:'Grape', count:3000 },
                       { fruit:'Apple', count:2300 },
                       { fruit:'Banana', count:500 },
                       { fruit:'Grape', count:4300 },
                       { fruit:'Papaya', count:1200 }
        ];
    
        args.treemap.dataSource = data;
    }
</script>

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using EJ2_Core_Application.Models;
using Newtonsoft.Json;

namespace EJ2_Core_Application.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
    }
}

Contents

Position and alignment
Legend mode
Legend size
Legend for items excluded from color mapping
Hide desired legend items
Hide legend items based data source value
Bind legend item text from data source
Hide duplicate legend items
Legend Responsiveness

Contents

Position and alignment
Legend mode
Legend size
Legend for items excluded from color mapping
Hide desired legend items
Hide legend items based data source value
Bind legend item text from data source
Hide duplicate legend items
Legend Responsiveness

Please provide additional information

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