Labels in Vue Diagram component

20 Mar 202324 minutes to read

Annotation is a block of text that can be displayed over a node or connector. Annotation is used to textually represent an object with a string that can be edited at runtime. Multiple annotations can be added to a node/connector.

Create annotation

An annotation can be added to a node/connector by defining the annotation object and adding that to the annotation collection of the node/connector. The content property of annotation defines the text to be displayed. The following code illustrates how to create a annotation.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' :connectors='connectors' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        // Position of the node
        offsetX: 100,
        offsetY: 100,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the Annotation for the Node
        annotations: [{
            // Sets the text to be displayed
            content: 'Annotation'
        }]
    }];
    let connectors = [{
        sourcePoint: {
            x: 300,
            y: 100
        },
        targetPoint: {
            x: 400,
            y: 300
        },
        type: 'Orthogonal',
        style: {
            strokeColor: '#6BA5D7'
        },
        // Sets the Annotation for the Connector
        annotations: [{
            // Sets the text to be diaplayed
            content: 'Annotation'
        }]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
                connectors: connectors
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Add annotations at runtime

  • Annotations can be added at runtime by using the client-side method addLabels. The following code illustrates how to add a annotation to a node.

  • The annotation’s ID property is used to define the name of the annotation and its further used to find the annotation at runtime and do any customization.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin ,ShapeAnnotationModel} from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        // Position of the node
        offsetX: 250,
        offsetY: 250,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
            }
        }
        mounted: function() {
            let diagramInstance: Diagram;
            let diagramObj: any = document.getElementById("diagram");
            diagramInstance = diagramObj.ej2_instances[0];
            let annotation: ShapeAnnotationModel[] = [{
                id: 'label1',
                content: 'Annotation'
            }]
            //Method to add labels at run time
            diagramInstance.addLabels(diagramInstance.nodes[0], annotation);
            diagramInstance.dataBind();
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Remove annotation

A collection of annotations can be removed from the node by using client-side method removeLabels. The following code illustrates how to remove a annotation to a node.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin,shapeAnnotationModel } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        // Position of the node
        offsetX: 250,
        offsetY: 250,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the annotation for the node
        annotations: [{
            id: 'label1',
            // Sets the text to be displayed
            content: 'Annotation'
        }]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
            }
        }
        mounted: function() {
            let diagramInstance: Diagram;
            let diagramObj: any = document.getElementById("diagram");
            diagramInstance = diagramObj.ej2_instances[0];
            let annotation: shapeAnnotationModel[] = [{
                id: 'label1',
                content: 'Annotation'
            }];
            diagramInstance.removeLabels(diagramInstance.nodes[0], annotation);
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Update annotation at runtime

You can change any annotation properties at runtime and update it through the client-side method dataBind.

The following code example illustrates how to change the annotation properties.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        // Position of the node
        offsetX: 250,
        offsetY: 250,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the annotation for the node
        annotations: [{
            content: 'Annotation'
        }]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
            }
        }
        mounted: function() {
            let diagramInstance: Diagram;
            let diagramObj: any = document.getElementById("diagram");
            diagramInstance = diagramObj.ej2_instances[0];
            // Adds to the Diagram
            diagramInstance.nodes[0].annotations[0].content = 'Updated Annotation';
            //Method to update the annotation at run time
            diagramInstance.dataBind();
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Alignment

Annotation can be aligned relative to the node boundaries. It has margin, offset, horizontal, and vertical alignment settings. It is quite tricky when all four alignments are used together but gives more control over alignment.

Offset

The offset property of annotation is used to align the annotations based on fractions. 0 represents top/left corner, 1 represents bottom/right corner, and 0.5 represents half of width/height.

Set the size for a nodes annotation by using width and height properties.

The following code shows the relationship between the annotation position (black color circle) and offset (fraction values).

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        // Position of the node
        offsetX: 250,
        offsetY: 250,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the annotation for the node
        annotations: [{
            // Sets the content for the annotation
            content: 'Annotation',
            //Sets the offset for the content
            offset: {
                x: 0,
                y: 1
            }
        }]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Horizontal and vertical alignment

The horizontalAlignment property of annotation is used to set how the annotation is horizontally aligned at the annotation position determined from the fraction values. The verticalAlignment property is used to set how annotation is vertically aligned at the annotation position.

The following tables illustrates all the possible alignments visually with ‘offset (0, 0)’.

Horizontal Alignment Vertical Alignment Output with Offset(0,0)
Left Top Left Top Label Alignment
Center Top Center Top Label Alignment
Right Top Right Top Label Alignment
Left Center Left Center Label Alignment
Center Center Center Center Label Alignment
Right Center Right Center Label Alignment
Left Bottom Left Bottom Label Alignment
Center Bottom Center Bottom Label Alignment
Right Bottom Right Bottom Label Alignment

The following codes illustrates how to align annotations.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        // Position of the node
        offsetX: 250,
        offsetY: 250,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the annotation for the node
        annotations: [{
            content: 'Annotation',
            // Sets the horizontal alignment as left
            horizontalAlignment: 'Left',
            // Sets the vertical alignment as Center
            verticalAlignment: 'Center'
        }]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Annotation alignment with respect to segments

The offset and alignment properties of annotation allows you to align the connector annotations with respect to the segments.

The following code example illustrates how to align connector annotations.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' :connectors='connectors'></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        id: 'node1',
        // Position of the node
        offsetX: 100,
        offsetY: 100,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the annotation for the node
        annotations: [{
            content: 'Task1'
        }]
    },
    {
        id: 'node2',
        // Position of the node
        offsetX: 300,
        offsetY: 100,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the annotation for the node
        annotations: [{
            content: 'Task2'
        }]
    }];
    let connectors = [{
        sourceID: 'node1',
        targetID: 'node2',
        type: 'Orthogonal',
        style: {
            strokeColor: '#6BA5D7',
            strokeWidth: 2
        },
        // Sets the annotation for the connector
        annotations: [{
            content: '0',
            // Sets the offset for the content
            offset: 0
        }, {
            content: '1',
            // Sets the offset for the content
            offset: 1
        }]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
                connectors: connectors
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Margin

Margin is an absolute value used to add some blank space in any one of its four sides. The annotations can be displaced with the margin property.

The following code example illustrates how to align a annotation based on its offset, horizontalAlignment, verticalAlignment, and margin values.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        id: 'node1',
        // Position of the node
        offsetX: 100,
        offsetY: 100,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the annotation for the connector
        annotations: [{
            content: 'Task1',
            // Sets the margin for the content
            margin: {
                top: 10
            },
            horizontalAlignment: 'Center',
            verticalAlignment: 'Top',
            offset: {
                x: 0.5,
                y: 1
            }
        }]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Text align

The textAlign property of annotation allows you to set how the text should be aligned (left, right, center, or justify) inside the text block. The following codes illustrate how to set textAlign for an annotation.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        id: 'node1',
        // Position of the node
        offsetX: 100,
        offsetY: 100,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the annotation for the NOde
        annotations: [{
            content: 'Text align is set as Left',
            // Sets the textAlign as left for the content
            style: {
                textAlign: 'Left'
            }
        }]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Diagram provides a support to add a hyperlink for the nodes/connectors annotation. It can also be customized.

A User can open the hyperlink in the new window, the same tab and the new tab by using the hyperlinkOpenState property

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        id: 'node1',
        // Position of the node
        offsetX: 100,
        offsetY: 100,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the annotation for the Node
        annotations: [{
            hyperlink: {
                link: 'https://hr.syncfusion.com/home',
                //Set the link to open in the current tab
                hyperlinkOpenState:'CurrentTab'
            }
        }]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Template Support for Annotation

Diagram provides template support for annotation. you should define a SVG/HTML content as string in the annotation’s template property.

The following code illustrates how to define a template in node’s annotation. similarly, you can define it in connectors.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' :connectors='connectors' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        id: 'node1',
        // Position of the node
        offsetX: 100,
        offsetY: 100,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the annotation for the Node
        annotations: [{
            // Set an template for annotation
            template: '<div><input type="button" value="Submit"></div>'
        }]
    }]
    let connectors = [{
        sourcePoint: {
            x: 300,
            y: 100
        },
        targetPoint: {
            x: 400,
            y: 300
        },
        type: 'Orthogonal',
        style: {
            strokeColor: '#6BA5D7'
        },
        // Sets the Annotation for the Connector
        annotations: [{
        // Set an template for annotation
        height: 60, width: 100, offset: 0.5,
        template: '<div><input type="button" value="Submit"></div>'
        }]
    }];
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
                connectors: connectors
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Wrapping

When text overflows node boundaries, you can control it by using text wrapping. So, it is wrapped into multiple lines. The wrapping property of annotation defines how the text should be wrapped. The following code illustrates how to wrap a text in a node.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        id: 'node1',
        // Position of the node
        offsetX: 100,
        offsetY: 100,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        //Sets the annotation for the node
        annotations: [{
            content: 'Annotation Text Wrapping',
            // Sets the style for the text wrapping
            style: {
                textWrapping: 'Wrap'
            }
        }]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Value Description Image
No Wrap Text will not be wrapped. Label No Wrap
Wrap Text-wrapping occurs, when the text overflows beyond the available node width. Label Wrap
WrapWithOverflow (Default) Text-wrapping occurs, when the text overflows beyond the available node width. However, the text may overflow beyond the node width in the case of a very long word. Label WrapWith Overflow

Text overflow

The label’s TextOverflow property is used control whether to display the overflowed content in node or not.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        id: 'node1',
        // Position of the node
        offsetX: 100,
        offsetY: 100,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the annotation for the node
        annotations: [{
            content: 'Annotation Text',
            // Sets the style for the text to be displayed
            style: {
                textOverflow: 'Ellipsis'
            }
        }]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Appearance

  • You can change the font style of the annotations with the font specific properties (fontSize, fontFamily, color). The following code illustrates how to customize the appearance of the annotation.

  • The label’s bold, italic, and textDecoration properties are used to style the label’s text.

  • The label’s fill, strokeColor, and strokeWidth properties are used to define the background color and border color of the annotation and the opacity property is used to define the transparency of the annotations.

  • The visible property of the annotation enables or disables the visibility of annotation.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        id: 'node1',
        // Position of the node
        offsetX: 100,
        offsetY: 100,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the annotation for the node
        annotations: [{
            content: 'Annotation Text',
            // Sets the style for the text to be displayed
            style: {
                color: 'black',
                bold: true,
                italic: true,
                fontSize: '12',
                fontFamily: 'TimesNewRoman'
            }
        }]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

The fill, border, and opacity appearances of the text can also be customized with appearance specific properties of annotation. The following code illustrates how to customize background, opacity, and border of the annotation.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        id: 'node1',
        // Position of the node
        offsetX: 100,
        offsetY: 100,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the annotation for the node
        annotations: [{
            content: 'Annotation Text',
            style: {
                color: 'black',
                fill: 'white',
                opacity: 0.7,
                strokeColor: 'black',
                strokeWidth: 2
            }
        }]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Interaction

Diagram allows annotation to be interacted by selecting, dragging, rotating, and resizing. Annotation interaction is disabled, by default. You can enable annotation interaction with the constraints property of annotation. You can also curtail the services of interaction by enabling either selecting, dragging, rotating, or resizing individually with the respective constraints property of annotation. The following code illustrates how to enable annotation interaction.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin,AnnotationConstraints } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        id: 'node1',
        // Position of the node
        offsetX: 100,
        offsetY: 100,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the annotation for the node
        annotations: [{
            content: 'Annotation Text',
            //Sets the constraints as Interaction
            constraints: AnnotationConstraints.Interaction
        }]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Edit

Diagram provides support to edit an annotation at runtime, either programmatically or interactively. By default, annotation is in view mode. But it can be brought to edit mode in two ways;

  • Programmatically
    By using startTextEdit method, edit the text through programmatically.

  • Interactively

    1. By double-clicking the annotation.
    2. By selecting the item and pressing the F2 key.

Double-clicking any annotation will enables editing and the node enables first annotation editing. When the focus of editor is lost, the annotation for the node is updated.

When you double-click on the node/connector/diagram model, the doubleClick event gets triggered.

Read-only annotations

Diagram allows to create read-only annotations. You have to set the read-only property of annotation to enable/disable the read-only constraints. The following code illustrates how to enable read-only mode.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin,AnnotationConstraints } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        id: 'node1',
        // Position of the node
        offsetX: 100,
        offsetY: 100,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the annotation for the node
        annotations: [{
            content: 'Annotation Text',
            //Sets the constraints as Read only
            constraints: AnnotationConstraints.ReadOnly
        }]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Drag Limit

  • The diagram control now supports defining the dragLimit to the label while dragging from the connector and also update the position to the nearest segment offset.

  • You can set the value to dragLimit left, right, top, and bottom properties which allow the dragging of connector labels to a certain limit based on the user defined values.

  • By default, drag limit will be disabled for the connector. It can be enabled by setting connector constraints as drag.

  • The following code illustrates how to set a dragLimit for connector annotations.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :connectors='connectors' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin,AnnotationConstraints } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let connectors = [
         {
            id: 'connector2',
            type: 'Orthogonal',
            sourcePoint: { x: 300, y: 300 },
            targetPoint: { x: 400, y: 400 },
            annotations: [
              {
                content: 'connector1', offset:0.5,
                //Enables drag constraints for a connector.
                constraints:AnnotationConstraints.Interaction | AnnotationConstraints.Drag,
                //Set drag limit for a connector annotation.
                dragLimit:{left:20,right:20,top:20,bottom:20}
              }
           ],
         }
     ]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                connectors: connectors,
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Multiple annotations

You can add any number of annotations to a node or connector. The following code illustrates how to add multiple annotations to a node.

<template>
    <div id="app">
        <ejs-diagram id="diagram"  :width='width' :height='height' :nodes='nodes' ></ejs-diagram>
    </div>
</template>
<script>
    import Vue from 'vue';
    import { DiagramPlugin } from '@syncfusion/ej2-vue-diagrams';
    Vue.use(DiagramPlugin);
    let nodes = [{
        id: 'node1',
        // Position of the node
        offsetX: 100,
        offsetY: 100,
        // Size of the node
        width: 100,
        height: 100,
        style: {
            fill: '#6BA5D7',
            strokeColor: 'white'
        },
        // Sets the multiple annotation for the node
        annotations: [{
                content: 'Left',
                offset: {
                    x: 0.12,
                    y: 0.1
                }
            },
            {
                content: 'Center',
                offset: {
                    x: 0.5,
                    y: 0.5
                }
            },
            {
                content: 'Right',
                offset: {
                    x: 0.82,
                    y: 0.9
                }
            }
        ]
    }]
    export default {
        name: 'app'
        data() {
            return {
                width: "100%",
                height: "350px",
                nodes: nodes,
            }
        }
    }
</script>
<style>
    @import "../../node_modules/@syncfusion/ej2-vue-diagrams/styles/material.css";
</style>

Constraints

The constraints property of annotation allows you to enable/disable certain annotation behaviors. For instance, you can disable annotation editing.