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Legend in ASP.NET Core TreeMap control
20 Jan 2022 / 4 minutes to read
Legend is used to provide valuable information for interpreting what the TreeMap displays. The legends can be represented in various colors, shapes or other identifiers based on the 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
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
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 TreeMap control supports two different types of legend rendering modes such as Default and Interactive.
Default mode
In default mode, the legends have symbols with legend labels that are used to identify the items in the TreeMap.
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 the legend when the mouse hovers on the TreeMap item. Enable this option by setting the mode property in the legendSettings to Interactive.
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
Customize the legend size by modifying the height and width properties in the legendSettings. It accepts values in both percentage and pixel.
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
TreeMap support legend paging, if the legend items cannot be placed within the provided height and width of the legend.
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 mapping ranges in the data source, get the excluded ranges from the color mapping, and show the legend with the excluded range values that 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 item for each color mapping, set the showLegend property to true in the 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 through the data source, bind the appropriate data source field name to showLegendPath property in the 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 item text from the data source, bind the property name from data source to the valuePath property in the 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 the 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 the bottom based on the available height and width. To enable the responsive legend, set the position property to Auto in the legendSettings and the legend position is changed based on the available height and width.
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
Contents
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