add property edit panel

add canvas component and add property edit panel, this panel will display while a workflow node is double clicked.

Issue-ID: SDC-260

Change-Id: I0f150b0a480f986e0a8ab3bb67cf89f3e2267155
Signed-off-by: Lvbo163 <lv.bo163@zte.com.cn>

16 files changed, 410 insertions, 88 deletions

diff --git a/sdc-workflow-designer-ui/.angular-cli.json b/sdc-workflow-designer-ui/.angular-cli.json
index dc7dacd1..7154dc18 100644
--- a/sdc-workflow-designer-ui/.angular-cli.json
+++ b/sdc-workflow-designer-ui/.angular-cli.json
@@ -1,60 +1,62 @@
 {
-  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
-  "project": {
-    "name": "workflowmodeler"
-  },
-  "apps": [
-    {
-      "root": "src",
-      "outDir": "dist",
-      "assets": [
-        "assets",
-        "favicon.ico"
-      ],
-      "index": "index.html",
-      "main": "main.ts",
-      "polyfills": "polyfills.ts",
-      "test": "test.ts",
-      "tsconfig": "tsconfig.app.json",
-      "testTsconfig": "tsconfig.spec.json",
-      "prefix": "app",
-      "styles": [
-        "styles.css"
-      ],
-      "scripts": [],
-      "environmentSource": "environments/environment.ts",
-      "environments": {
-        "dev": "environments/environment.ts",
-        "prod": "environments/environment.prod.ts"
-      }
-    }
-  ],
-  "e2e": {
-    "protractor": {
-      "config": "./protractor.conf.js"
-    }
-  },
-  "lint": [
-    {
-      "project": "src/tsconfig.app.json",
-      "exclude": "**/node_modules/**"
+    "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
+    "project": {
+        "name": "workflowmodeler"
     },
-    {
-      "project": "src/tsconfig.spec.json",
-      "exclude": "**/node_modules/**"
+    "apps": [
+        {
+            "root": "src",
+            "outDir": "dist",
+            "assets": [
+                "assets",
+                "favicon.ico"
+            ],
+            "index": "index.html",
+            "main": "main.ts",
+            "polyfills": "polyfills.ts",
+            "test": "test.ts",
+            "tsconfig": "tsconfig.app.json",
+            "testTsconfig": "tsconfig.spec.json",
+            "prefix": "app",
+            "styles": [
+                "./../node_modules/bootstrap/dist/css/bootstrap.min.css",
+                "./../node_modules/font-awesome/css/font-awesome.min.css",
+                "styles.css"
+            ],
+            "scripts": [],
+            "environmentSource": "environments/environment.ts",
+            "environments": {
+                "dev": "environments/environment.ts",
+                "prod": "environments/environment.prod.ts"
+            }
+        }
+    ],
+    "e2e": {
+        "protractor": {
+            "config": "./protractor.conf.js"
+        }
     },
-    {
-      "project": "e2e/tsconfig.e2e.json",
-      "exclude": "**/node_modules/**"
-    }
-  ],
-  "test": {
-    "karma": {
-      "config": "./karma.conf.js"
+    "lint": [
+        {
+            "project": "src/tsconfig.app.json",
+            "exclude": "**/node_modules/**"
+        },
+        {
+            "project": "src/tsconfig.spec.json",
+            "exclude": "**/node_modules/**"
+        },
+        {
+            "project": "e2e/tsconfig.e2e.json",
+            "exclude": "**/node_modules/**"
+        }
+    ],
+    "test": {
+        "karma": {
+            "config": "./karma.conf.js"
+        }
+    },
+    "defaults": {
+        "styleExt": "css",
+        "component": {}
     }
-  },
-  "defaults": {
-    "styleExt": "css",
-    "component": {}
-  }
 }
diff --git a/sdc-workflow-designer-ui/package-lock.json b/sdc-workflow-designer-ui/package-lock.json
index 8a9931ba..e667b96c 100644
--- a/sdc-workflow-designer-ui/package-lock.json
+++ b/sdc-workflow-designer-ui/package-lock.json
@@ -927,6 +927,15 @@
         "hoek": "2.16.3"
       }
     },
+    "bootstrap": {
+      "version": "4.0.0-alpha.6",
+      "resolved": "http://10.75.8.148/repository/npm-pub/bootstrap/-/bootstrap-4.0.0-alpha.6.tgz",
+      "integrity": "sha1-T1TdM6wN6sOyhAe8LffsYIhpycg=",
+      "requires": {
+        "jquery": "3.2.1",
+        "tether": "1.4.0"
+      }
+    },
     "brace-expansion": {
       "version": "1.1.8",
       "resolved": "http://registry.npm.taobao.org/brace-expansion/download/brace-expansion-1.1.8.tgz",
@@ -2824,6 +2833,11 @@
       "integrity": "sha1-2uRqnXj74lKSJYzB54CkHZXAN4I=",
       "dev": true
     },
+    "font-awesome": {
+      "version": "4.7.0",
+      "resolved": "http://10.75.8.148/repository/npm-pub/font-awesome/-/font-awesome-4.7.0.tgz",
+      "integrity": "sha1-j6jPBBGhoxr9B7BtKQK7n8gVoTM="
+    },
     "for-in": {
       "version": "1.0.2",
       "resolved": "http://registry.npm.taobao.org/for-in/download/for-in-1.0.2.tgz",
@@ -4160,6 +4174,11 @@
       "integrity": "sha1-2llSddGuYx3nNqwKfH2Fyfc+9lI=",
       "dev": true
     },
+    "jquery": {
+      "version": "3.2.1",
+      "resolved": "http://10.75.8.148/repository/npm-pub/jquery/-/jquery-3.2.1.tgz",
+      "integrity": "sha1-XE2d5lKvbNCncBVKYxu6ErAVx4c="
+    },
     "js-base64": {
       "version": "2.1.9",
       "resolved": "http://registry.npm.taobao.org/js-base64/download/js-base64-2.1.9.tgz",
@@ -7804,6 +7823,11 @@
         }
       }
     },
+    "tether": {
+      "version": "1.4.0",
+      "resolved": "http://10.75.8.148/repository/npm-pub/tether/-/tether-1.4.0.tgz",
+      "integrity": "sha1-D5+hcfdb9YSF2BSelHmdeudNHBo="
+    },
     "through": {
       "version": "2.3.8",
       "resolved": "http://registry.npm.taobao.org/through/download/through-2.3.8.tgz",
diff --git a/sdc-workflow-designer-ui/package.json b/sdc-workflow-designer-ui/package.json
index 1489a8cc..c9760fc8 100644
--- a/sdc-workflow-designer-ui/package.json
+++ b/sdc-workflow-designer-ui/package.json
@@ -22,7 +22,9 @@
     "@angular/platform-browser-dynamic": "^4.2.4",
     "@angular/router": "^4.2.4",
     "angular-in-memory-web-api": "^0.3.2",
+    "bootstrap": "^4.0.0-alpha.6",
     "core-js": "^2.4.1",
+    "font-awesome": "^4.7.0",
     "jsplumb": "2.5.0",
     "rxjs": "^5.4.2",
     "zone.js": "^0.8.14"
diff --git a/sdc-workflow-designer-ui/src/app/app.component.html b/sdc-workflow-designer-ui/src/app/app.component.html
index f666c1b7..08b57b81 100644
--- a/sdc-workflow-designer-ui/src/app/app.component.html
+++ b/sdc-workflow-designer-ui/src/app/app.component.html
@@ -12,11 +12,10 @@
  */
 -->
 
-<!--The content below is only a placeholder and can be replaced.-->
 
 <b4t-toolbar></b4t-toolbar>
 
-<div id="container" class="container">
-    <b4t-node *ngFor="let node of getWorkflow()?.nodes; let last = last;" [node]="node" [last]="last"></b4t-node>
-</div>
+<b4t-canvas></b4t-canvas>
+
+<b4t-properties></b4t-properties>
 
diff --git a/sdc-workflow-designer-ui/src/app/app.component.ts b/sdc-workflow-designer-ui/src/app/app.component.ts
index 29c4d06f..931e7354 100644
--- a/sdc-workflow-designer-ui/src/app/app.component.ts
+++ b/sdc-workflow-designer-ui/src/app/app.component.ts
@@ -23,27 +23,6 @@ import { ActivatedRoute } from "@angular/router";
   templateUrl: './app.component.html',
   styleUrls: ['./app.component.css']
 })
-export class AppComponent implements AfterViewInit, OnInit {
-    constructor(private jsplumbService: JsPlumbService,
-        private dataAccessService: DataAccessService,
-        private route: ActivatedRoute,
-        private workflowService: WorkflowService) {}
+export class AppComponent {
 
-    ngOnInit(): void {
-        this.route.queryParams.subscribe(params => {
-            if(params.id) {
-                this.dataAccessService.catalogService.loadWorkflow(params.id).subscribe(workflow => {
-                    this.workflowService.workflow = workflow;
-                });
-            }
-        });
-    }
-
-    public getWorkflow(): Workflow {
-        return this.workflowService.workflow;
-    }
-
-    ngAfterViewInit(): void {
-        this.jsplumbService.buttonDroppable();
-    }
 }
diff --git a/sdc-workflow-designer-ui/src/app/app.module.ts b/sdc-workflow-designer-ui/src/app/app.module.ts
index 8d92d0ae..4b6a3a96 100644
--- a/sdc-workflow-designer-ui/src/app/app.module.ts
+++ b/sdc-workflow-designer-ui/src/app/app.module.ts
@@ -25,11 +25,16 @@ import { InMemoryWebApiModule } from "angular-in-memory-web-api";
 import { InMemoryDataService } from "./services/data-access/in-memory-data.service";
 import { HttpModule } from "@angular/http";
 import { RouterModule } from "@angular/router";
+import { BroadcastService } from "./services/broadcast.service";
+import { PropertiesComponent } from "./components/property/properties.component";
+import { CanvasComponent } from "./components/canvas/canvas.component";
 
 @NgModule({
     declarations: [
         AppComponent,
+        CanvasComponent,
         NodeComponent,
+        PropertiesComponent,
         ToolbarComponent,
     ],
     imports: [
@@ -40,6 +45,7 @@ import { RouterModule } from "@angular/router";
         SharedModule,
     ],
     providers: [
+        BroadcastService,
         DataAccessService,
         HttpService,
         JsPlumbService,
diff --git a/sdc-workflow-designer-ui/src/app/components/canvas/canvas.component.css b/sdc-workflow-designer-ui/src/app/components/canvas/canvas.component.css
new file mode 100644
index 00000000..fec14a47
--- /dev/null
+++ b/sdc-workflow-designer-ui/src/app/components/canvas/canvas.component.css
@@ -0,0 +1,26 @@
+/**
+ * Copyright (c) 2017 ZTE Corporation.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and the Apache License 2.0 which both accompany this distribution,
+ * and are available at http://www.eclipse.org/legal/epl-v10.html
+ * and http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Contributors:
+ *     ZTE - initial API and implementation and/or initial documentation
+ */
+
+.canvas {
+    -webkit-overflow-scrolling: touch;
+    -webkit-touch-callout: none;
+    -webkit-user-select: none;
+    -khtml-user-select: none;
+    -moz-user-select: none;
+    -ms-user-select: none;
+    user-select: none;
+    height: 100%;
+    position: relative;
+    overflow: scroll;
+    z-index: 0;
+    background-color: #84acb3;
+}
diff --git a/sdc-workflow-designer-ui/src/app/components/canvas/canvas.component.html b/sdc-workflow-designer-ui/src/app/components/canvas/canvas.component.html
new file mode 100644
index 00000000..97fe3a67
--- /dev/null
+++ b/sdc-workflow-designer-ui/src/app/components/canvas/canvas.component.html
@@ -0,0 +1,16 @@
+<!--
+/**
+ * Copyright (c) 2017 ZTE Corporation.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and the Apache License 2.0 which both accompany this distribution,
+ * and are available at http://www.eclipse.org/legal/epl-v10.html
+ * and http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Contributors:
+ *     ZTE - initial API and implementation and/or initial documentation
+ */
+-->
+<div id="canvas" class="canvas" (click)="canvasClick()">
+    <b4t-node *ngFor="let node of getWorkflow()?.nodes; let last = last;" [node]="node" [last]="last"></b4t-node>
+</div>
diff --git a/sdc-workflow-designer-ui/src/app/components/canvas/canvas.component.ts b/sdc-workflow-designer-ui/src/app/components/canvas/canvas.component.ts
new file mode 100644
index 00000000..e1a40297
--- /dev/null
+++ b/sdc-workflow-designer-ui/src/app/components/canvas/canvas.component.ts
@@ -0,0 +1,62 @@
+/**
+ * Copyright (c) 2017 ZTE Corporation.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and the Apache License 2.0 which both accompany this distribution,
+ * and are available at http://www.eclipse.org/legal/epl-v10.html
+ * and http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Contributors:
+ *     ZTE - initial API and implementation and/or initial documentation
+ */
+
+import { AfterViewInit, Component } from '@angular/core';
+
+import { BroadcastService } from '../../services/broadcast.service';
+import { JsPlumbService } from '../../services/jsplumb.service';
+import { ActivatedRoute } from "@angular/router";
+import { DataAccessService } from "../../services/data-access/data-access.service";
+import { WorkflowService } from "../../services/workflow.service";
+import { Workflow } from "../../model/workflow";
+
+/**
+ * main canvas, it contains two parts: canvas and node property component
+ * bpmn task nodes can be dropped into this canvas, and then the workflow can be edit
+ */
+@Component({
+    selector: 'b4t-canvas',
+    styleUrls: ['./canvas.component.css'],
+    templateUrl: 'canvas.component.html',
+})
+export class CanvasComponent implements AfterViewInit {
+
+    constructor(private broadcastService: BroadcastService,
+        private dataAccessService: DataAccessService,
+        private jsPlumbService: JsPlumbService,
+        private route: ActivatedRoute,
+        private workflowService: WorkflowService) {
+    }
+
+    ngOnInit(): void {
+        this.route.queryParams.subscribe(params => {
+            if (params.id) {
+                this.dataAccessService.catalogService.loadWorkflow(params.id).subscribe(workflow => {
+                    this.workflowService.workflow = workflow;
+                });
+            }
+        });
+    }
+
+    public ngAfterViewInit() {
+        this.jsPlumbService.buttonDroppable();
+    }
+
+    public canvasClick() {
+        this.broadcastService.broadcast(this.broadcastService.showProperty, false);
+    }
+
+
+    public getWorkflow(): Workflow {
+        return this.workflowService.workflow;
+    }
+}
diff --git a/sdc-workflow-designer-ui/src/app/components/node/node.component.html b/sdc-workflow-designer-ui/src/app/components/node/node.component.html
index a178e6f5..f875718d 100644
--- a/sdc-workflow-designer-ui/src/app/components/node/node.component.html
+++ b/sdc-workflow-designer-ui/src/app/components/node/node.component.html
@@ -11,8 +11,8 @@
  *     ZTE - initial API and implementation and/or initial documentation

  */

 -->

-<div class="node" [style.top]="node.top + 'px'" [style.left]="node.left + 'px'">

-     <div>{{node.name}}</div>

+<div class="node" id="{{node.id}}" (dblclick)="showProperties()" [style.top]="node.top + 'px'" [style.left]="node.left + 'px'">

+    <div>{{node.name}}</div>

     <div class="anchor anchors anchor-left">

         <span class="left">

             <i class="left-arrow1"></i>

diff --git a/sdc-workflow-designer-ui/src/app/components/node/node.component.ts b/sdc-workflow-designer-ui/src/app/components/node/node.component.ts
index c2686fbb..24b784fe 100644
--- a/sdc-workflow-designer-ui/src/app/components/node/node.component.ts
+++ b/sdc-workflow-designer-ui/src/app/components/node/node.component.ts
@@ -13,6 +13,8 @@
 import { Component, AfterViewInit, Input } from '@angular/core';

 

 import { JsPlumbService } from '../../services/jsplumb.service';

+import { BroadcastService } from "../../services/broadcast.service";

+import { WorkflowNode } from "../../model/workflow-node";

 

 /**

  * workflow node component

@@ -24,10 +26,11 @@ import { JsPlumbService } from '../../services/jsplumb.service';
 })

 export class NodeComponent implements AfterViewInit {

 

-    @Input() public node: Node;

+    @Input() public node: WorkflowNode;

     @Input() public last: boolean;

 

-    constructor(private jsPlumbService: JsPlumbService) {

+    constructor(private broadcastService: BroadcastService,

+        private jsPlumbService: JsPlumbService) {

 

     }

 

@@ -37,4 +40,9 @@ export class NodeComponent implements AfterViewInit {
         }

     }

 

+    public showProperties() {

+        this.broadcastService.broadcast(this.broadcastService.nodeProperty, this.node);

+        this.broadcastService.broadcast(this.broadcastService.showProperty, true);

+    }

+

 }

diff --git a/sdc-workflow-designer-ui/src/app/components/property/properties.component.css b/sdc-workflow-designer-ui/src/app/components/property/properties.component.css
new file mode 100644
index 00000000..b5c07531
--- /dev/null
+++ b/sdc-workflow-designer-ui/src/app/components/property/properties.component.css
@@ -0,0 +1,43 @@
+/**
+ * Copyright (c) 2017 ZTE Corporation.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and the Apache License 2.0 which both accompany this distribution,
+ * and are available at http://www.eclipse.org/legal/epl-v10.html
+ * and http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Contributors:
+ *     ZTE - initial API and implementation and/or initial documentation
+ */
+
+.wm-properties-wrapper {
+    background-color: white;
+    position: fixed;
+    width: 500px;
+    height: 100%;
+    border-left: 1px solid #00aaff;
+    z-index: 2000;
+    right: 0;
+    top: 0;
+    bottom: 0;
+    padding-left: 20px;
+    margin-bottom: 0;
+    padding-right: 20px;
+    padding-top: 40px;
+    -webkit-box-shadow: 0 0 6px rgba(0, 0, 0, 0.5);
+    box-shadow: 0 0 6px rgba(0, 0, 0, 0.5);
+    border-radius: 0;
+    overflow-y: scroll;
+}
+
+.edit {
+    display: none;
+}
+
+.editing .view {
+    display: none;
+}
+
+.editing .edit {
+    display: block;
+}
diff --git a/sdc-workflow-designer-ui/src/app/components/property/properties.component.html b/sdc-workflow-designer-ui/src/app/components/property/properties.component.html
new file mode 100644
index 00000000..00aea176
--- /dev/null
+++ b/sdc-workflow-designer-ui/src/app/components/property/properties.component.html
@@ -0,0 +1,43 @@
+<!--
+/**
+ * Copyright (c) 2017 ZTE Corporation.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and the Apache License 2.0 which both accompany this distribution,
+ * and are available at http://www.eclipse.org/legal/epl-v10.html
+ * and http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Contributors:
+ *     ZTE - initial API and implementation and/or initial documentation
+ */
+ -->
+
+<div class="wm-properties-wrapper" *ngIf="show">
+    <div class="form-group row">
+        <div *ngIf="!titleEditing" class="view col-md-10" (dblclick)="titleEditing = !titleEditing">
+            <h4>{{node.name}}</h4>
+        </div>
+        <div class="col-md-10" *ngIf="titleEditing">
+            <input class="form-control" (blur)="nodeNameChanged()" type="text" [(ngModel)]="node.name"/>
+        </div>
+
+        <div class="col-md-2">
+            <button (click)="deleteNode()" type="button" class="btn btn-danger">
+                <i class="fa fa-trash" style="margin-right: 5px;"></i>
+            </button>
+        </div>
+
+    </div>
+    <hr>
+
+    <div class="form-group row">
+        <label class="col-md-2 form-control-label text-md-right" for="nodeType">Type</label>
+        <div class="col-md-10">
+            <input class="form-control" name="nodeType" disabled type="text" value="{{node.type}}"/>
+        </div>
+    </div>
+
+    <!-- TODO  add property for different node types -->
+    <span>TODO: property for different node types</span>
+
+</div>
diff --git a/sdc-workflow-designer-ui/src/app/components/property/properties.component.ts b/sdc-workflow-designer-ui/src/app/components/property/properties.component.ts
new file mode 100644
index 00000000..bedf682f
--- /dev/null
+++ b/sdc-workflow-designer-ui/src/app/components/property/properties.component.ts
@@ -0,0 +1,57 @@
+/**
+ * Copyright (c) 2017 ZTE Corporation.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and the Apache License 2.0 which both accompany this distribution,
+ * and are available at http://www.eclipse.org/legal/epl-v10.html
+ * and http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Contributors:
+ *     ZTE - initial API and implementation and/or initial documentation
+ */
+
+import { AfterViewInit, Component } from '@angular/core';
+
+import { WorkflowNode } from '../../model/workflow-node';
+import { BroadcastService } from '../../services/broadcast.service';
+import { JsPlumbService } from '../../services/jsplumb.service';
+import { WorkflowService } from '../../services/workflow.service';
+
+/**
+ * property component presents information of a workflow node.
+ * the presented information can be edit in this component.
+ * it may load information dynamically. the content may be different for different node type.
+ */
+@Component({
+    selector: 'b4t-properties',
+    styleUrls: ['./properties.component.css'],
+    templateUrl: 'properties.component.html',
+})
+export class PropertiesComponent implements AfterViewInit {
+    public node: WorkflowNode;
+    public show = false;
+    public titleEditing = false;
+
+    constructor(private broadcastService: BroadcastService,
+                private jsPlumnService: JsPlumbService,
+                private workflowService: WorkflowService) {
+
+    }
+
+    public ngAfterViewInit() {
+        this.broadcastService.showProperty$.subscribe(show => this.show = show);
+        this.broadcastService.nodeProperty$.subscribe(node => this.node = node);
+    }
+
+    public nodeNameChanged() {
+        this.titleEditing = !this.titleEditing;
+        this.jsPlumnService.jsplumbInstance.repaintEverything();
+    }
+
+    public deleteNode() {
+        this.show = false;
+
+        this.jsPlumnService.remove(this.node.id);
+        this.workflowService.deleteNode(this.node.id);
+    }
+}
diff --git a/sdc-workflow-designer-ui/src/app/services/broadcast.service.ts b/sdc-workflow-designer-ui/src/app/services/broadcast.service.ts
new file mode 100644
index 00000000..82e4cbbb
--- /dev/null
+++ b/sdc-workflow-designer-ui/src/app/services/broadcast.service.ts
@@ -0,0 +1,50 @@
+/**
+ * Copyright (c) 2017 ZTE Corporation.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and the Apache License 2.0 which both accompany this distribution,
+ * and are available at http://www.eclipse.org/legal/epl-v10.html
+ * and http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Contributors:
+ *     ZTE - initial API and implementation and/or initial documentation
+ */
+import { Injectable } from '@angular/core';
+import { Subject } from 'rxjs/Subject';
+
+import { WorkflowNode } from '../model/workflow-node';
+
+/**
+ * BroadcastService
+ * All of the observable subject should be registered to this service.
+ * It provider a broadcast method to broadcast data. the broadcast method would catch error while broadcasting.
+ */
+@Injectable()
+export class BroadcastService {
+
+    public jsPlumbInstance = new Subject<any>();
+    public jsPlumbInstance$ = this.jsPlumbInstance.asObservable();
+
+    public showProperty = new Subject<boolean>();
+    public showProperty$ = this.showProperty.asObservable();
+
+    public saveEvent = new Subject<string>();
+    public saveEvent$ = this.saveEvent.asObservable();
+
+    public nodeProperty = new Subject<WorkflowNode>();
+    public nodeProperty$ = this.nodeProperty.asObservable();
+
+    /**
+     * broadcast datas
+     * this method will catch the exceptions for the broadcast
+     * @param subject will broadcast data
+     * @param data will be broadcated
+     */
+    public broadcast(subject: Subject<any>, data: any) {
+        try {
+            subject.next(data);
+        } catch (err) {
+            console.error(err);
+        }
+    }
+}
diff --git a/sdc-workflow-designer-ui/src/app/services/jsplumb.service.ts b/sdc-workflow-designer-ui/src/app/services/jsplumb.service.ts
index 33c88d4f..d192a82d 100644
--- a/sdc-workflow-designer-ui/src/app/services/jsplumb.service.ts
+++ b/sdc-workflow-designer-ui/src/app/services/jsplumb.service.ts
@@ -20,7 +20,7 @@ import { WorkflowService } from "./workflow.service";
  */

 @Injectable()

 export class JsPlumbService {

-    private jsplumbInstance;

+    public jsplumbInstance;

 

     constructor(private workflowService: WorkflowService) {

         this.initJsPlumbInstance();

@@ -29,7 +29,7 @@ export class JsPlumbService {
 

     public initJsPlumbInstance() {

         this.jsplumbInstance = jsp.jsPlumb.getInstance({

-            Container: 'container'

+            Container: 'canvas'

         });

 

         this.jsplumbInstance.importDefaults({

@@ -90,6 +90,10 @@ export class JsPlumbService {
 

     }

 

+    public remove(nodeId: string) {

+        this.jsplumbInstance.remove(nodeId);

+    }

+

     public buttonDraggable() {

         const selector = this.jsplumbInstance.getSelector('.toolbar .item');

         this.jsplumbInstance.draggable(selector,

@@ -100,7 +104,8 @@ export class JsPlumbService {
     }

 

     public buttonDroppable() {

-        const selector = this.jsplumbInstance.getSelector('.container');

+        console.log('buttonDroppable');

+        const selector = this.jsplumbInstance.getSelector('.canvas');

         this.jsplumbInstance.droppable(selector, {

             scope: 'btn',

             drop: event => {