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Tooltip in ASP.NET MVC Diagram control

In Graphical User Interface (GUI), the tooltip is a message that is displayed when mouse hovers over an element. The diagram provides tooltip support while dragging, resizing, rotating a node, and when the mouse hovers any diagram element.

Default tooltip

By default, diagram displays a tooltip to provide the size, position, and angle related information while dragging, resizing, and rotating. The following images illustrate how the diagram displays the node information during an interaction.

Drag Resize Rotate
ToolTip During Drag ToolTip During Resize ToolTip During Rotate

Common tooltip for all nodes and connectors

The diagram provides support to show tooltip when the mouse hovers over any node/connector. To show tooltip on mouse over, the tooltip property of diagram model needs to be set with the tooltip content and position as shown in the following example.

default.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {
            List < DiagramNode > nodes = new List < DiagramNode > ();
            nodes.Add(new DiagramNode() {
                Id = "node1",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "#6BA5D7",
                            StrokeColor = "White"
                    },
                    OffsetX = 100,
                    OffsetY = 100,
                   // Set constraints for the node
                    constraints = NodeConstraints.Default | NodeConstraints.Tooltip,
                    Tooltip = new DiagramDiagramTooltip() { Content = "Nodes", Position = "TopLeft"}
            });
            ViewBag.nodes = nodes;
            string position = "TopLeft";
            ViewBag.position = position;


            return View();
        }
    }
}

Disable tooltip at runtime

The tooltip on mouse over can be disabled by assigning the tooltip property as null. The following code example illustrates how to disable the mouse over tooltip at runtime.

disable.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {
            List < DiagramNode > nodes = new List < DiagramNode > ();
            nodes.Add(new DiagramNode() {
                Id = "node1",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "#6BA5D7",
                            StrokeColor = "White"
                    },
                    OffsetX = 100,
                    OffsetY = 100,
            });
            ViewBag.nodes = nodes;
            string position = "TopLeft";
            ViewBag.position = position;


            return View();
        }
    }
}

Tooltip for a specific node/connector

The tooltip can be customized for each node and connector. Remove the InheritTooltip option from the constraints of that node/connector. The following code example illustrates how to customize the tooltip for individual elements.

object.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {
            List < DiagramNode > nodes = new List < DiagramNode > ();
            nodes.Add(new DiagramNode() {
                Id = "node1",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "#6BA5D7",
                            StrokeColor = "White"
                    },
                    OffsetX = 100,
                    OffsetY = 100,
                    Constraints = NodeConstraints.Default | NodeConstraints.Tooltip,
                    Tooltip = new DiagramDiagramTooltip() { Content = "Nodes", Position = "TopLeft",  RelativeMode= TooltipRelativeMode.Object}
            });
            ViewBag.nodes = nodes;
            string position = "TopLeft";
            ViewBag.position = position;


            return View();
        }
    }
}

Tooltip template content

Any text or image can be added to the tooltip, by default. To customize the tooltip layout or to create your own visualized element on the tooltip, template can be used.

The following code example illustrates how to add formatted HTML content to the tooltip.

template.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {
            string position = "TopLeft";
            ViewBag.position = position;
            ViewBag.getContent = "getContent";
            return View();
        }
    }
}
function getContent() {
    var tooltipContent = document.createElement('div');
    tooltipContent.innerHTML = '<div style="background-color: #f4f4f4; color: black; border-width:1px;border-style: solid;border-color: #d3d3d3; border-radius: 8px;white-space: nowrap;"> <span style="margin: 10px;"> Tooltip !!! </span> </div>';
    return tooltipContent;
}

Tooltip alignments

Tooltip relative to object

The diagram provides support to show tooltip around the node/connector that is hovered by the mouse. The tooltip can be aligned by using the position property of the tooltip. The relativeMode property of the tooltip defines whether the tooltip has to be displayed around the object or at the mouse position.

The following code example illustrates how to position the tooltip around object.

object.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {
            List < DiagramNode > nodes = new List < DiagramNode > ();
            nodes.Add(new DiagramNode() {
                Id = "node1",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "#6BA5D7",
                            StrokeColor = "White"
                    },
                    OffsetX = 100,
                    OffsetY = 100,
                    Constraints = NodeConstraints.Default | NodeConstraints.Tooltip,
                    Tooltip = new DiagramDiagramTooltip() { Content = "Nodes", Position = "TopLeft",  RelativeMode= TooltipRelativeMode.Object}
            });
            ViewBag.nodes = nodes;
            string position = "TopLeft";
            ViewBag.position = position;


            return View();
        }
    }
}

Tooltip relative to mouse position

To display the tooltip at mouse position, need to set mouse option to the relativeMode property of the tooltip. The following code example illustrates how to show tooltip at mouse position.

mouse.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {
            List < DiagramNode > nodes = new List < DiagramNode > ();
            nodes.Add(new DiagramNode() {
                Id = "node1",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "#6BA5D7",
                            StrokeColor = "White"
                    },
                    OffsetX = 100,
                    OffsetY = 100,
                    Constraints = NodeConstraints.Default | NodeConstraints.Tooltip,
                    Tooltip = new DiagramDiagramTooltip() { Content = "Nodes", Position = "TopLeft",  RelativeMode= TooltipRelativeMode.Mouse}
            });
            ViewBag.nodes = nodes;
            string position = "TopLeft";
            ViewBag.position = position;


            return View();
        }
    }
}

Tooltip animation

To animate the tooltip, a set of specific animation effects are available, and it can be controlled by using the animation property. The animation property also allows you to set delay, duration, and various other effects of your choice.

animation.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Syncfusion.EJ2.Diagrams;
using System.Drawing;

namespace EJ2MVCSampleBrowser.Controllers.Diagram {
    public partial class DiagramController: Controller {
        // GET: Nodes
        public ActionResult Nodes() {
            List < DiagramNode > nodes = new List < DiagramNode > ();
            nodes.Add(new DiagramNode() {
                Id = "node1",
                    Width = 100,
                    Height = 100,
                    Style = new NodeStyleNodes() {
                        Fill = "#6BA5D7",
                            StrokeColor = "White"
                    },
                    OffsetX = 100,
                    OffsetY = 100,
                    Constraints = NodeConstraints.Default | NodeConstraints.Tooltip,
                    Tooltip = new DiagramDiagramTooltip() { Content = "Nodes", Position = "TopLeft",  RelativeMode= TooltipRelativeMode.Object}
            });
            ViewBag.nodes = nodes;
            string position = "TopLeft";
            ViewBag.position = position;


            return View();
        }
    }
}
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