parenthesis are mandatory

docs/diagrams-and-syntax-and-examples/flowchart.md

@@ -601,7 +601,7 @@ flowchart TB
 It is possible to bind a click event to a node, the click can lead to either a javascript callback or to a link which will be opened in a new browser tab. **Note**: This functionality is disabled when using `securityLevel='strict'` and enabled when using `securityLevel='loose'`.
 
 ```
-click nodeId call callback
+click nodeId call callback()
 ```
 
 * nodeId is the id of the node
@@ -620,7 +620,7 @@ Examples of tooltip usage below:
 ```
 graph LR;
     A-->B;
-    click A call callback "Tooltip for a callback"
+    click A call callback() "Tooltip for a callback"
     click B href "http://www.github.com" "This is a tooltip for a link"
 ```
 
@@ -629,7 +629,7 @@ The tooltip text is surrounded in double quotes. The styles of the tooltip are s
 ```mermaid
 graph LR
     A-->B;
-    click A call callback "Tooltip"
+    click A call callback() "Tooltip"
     click B href "http://www.github.com" "This is a link"
 ```
 > **Success** The tooltip functionality and the ability to link to urls are available from version 0.5.2.
@@ -659,7 +659,7 @@ Beginners tip, a full example using interactive links in a html context:
   <div class="mermaid">
     graph LR;
         A-->B;
-        click A call callback "Tooltip"
+        click A call callback() "Tooltip"
         click B href "http://www.github.com" "This is a link"
   </div>
 

src/diagrams/flowchart/parser/flow-interactions.spec.js

@@ -25,7 +25,7 @@ describe('[Interactions] when parsing', () => {
   it('it should be possible to use click to a callback with toolip', function() {
     spyOn(flowDb, 'setClickEvent');
     spyOn(flowDb, 'setTooltip');
-    const res = flow.parser.parse('graph TD\nA-->B\nclick A call callback "tooltip"');
+    const res = flow.parser.parse('graph TD\nA-->B\nclick A call callback() "tooltip"');
 
     const vert = flow.parser.yy.getVertices();
     const edges = flow.parser.yy.getEdges();