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The MindFusion Forums › Flow Diagramming Components › Html Canvas & JavaScript › Prevent Multiple Links With The Same Origin and Destination Nodes

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Prevent Multiple Links With The Same Origin and Destination Nodes (Read 1006 times)

alukes Junior Member Offline I love YaBB 1G - SP1! Posts: 61 Joined: Jul 1^st, 2011	Prevent Multiple Links With The Same Origin and Destination Nodes Dec 22^nd, 2022 at 4:35am	Print Post
	As an example: If A user draws a true link from a decision node to a destination node, I want to prevent the user from drawing a false link to the same destination node. The following code doesn't remove the new link. The tag contains an ID number. function onLinkCreated(sender, args) { let linkCount = 0; let createdLink = args.getLink(); let tempShapeName = createdLink.getOrigin().getShape().getId(); if ( tempShapeName === "Decision" ) { let newDest = createdLink.getDestination(); let newDestTag = newDest.getTag(); let selLinks = createdLink.getOrigin().getOutgoingLinks(); for (var i = 0; i < selLinks.length; i++) { let checkLink = selLinks[i]; let checkDestTag = checkLink.getDestination().getTag(); if (checkDestTag === newDestTag) { linkCount = linkCount + 1; } } if (linkCount >1) { miFu.diagram.startCompositeOperation(); miFu.diagram.removeItem(createdLink); Also tried (selLinks[1]) same result miFu.diagram.commitCompositeOperaton(); miFu.diagram.getSelection().clear(); } }
	« Last Edit: Dec 22^nd, 2022 at 5:15pm by alukes »

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Slavcho YaBB Moderator Offline tech.support Posts: 3152 Joined: Oct 19^th, 2005	Re: Prevent Multiple Links With The Same Origin and Destination Nodes Reply #1 - Dec 22^nd, 2022 at 2:10pm	Print Post
	The best place to prevent creation is linkCreating validation event: https://www.mindfusion.eu/onlinehelp/jsdiagram/P_MindFusion_Diagramming_Events_l... Code diagram.addEventListener(Events.linkCreating, onLinkCreating); function onLinkCreating(diagram, args) { if (args.origin.shape.id == "Decision" && args.destination) { var destNodes = args.origin.outgoingLinks.map(l => l.destination); args.cancel = destNodes.includes(args.destination); } } I don't keep version 3 of the control to try your code. Try tracing with debugger to verify you aren't deleting the first link too, and check in browser console if there aren't some exceptions reported leading to repaint problems. Regards, Slavcho Mindfusion


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alukes Junior Member Offline I love YaBB 1G - SP1! Posts: 61 Joined: Jul 1^st, 2011	Re: Prevent Multiple Links With The Same Origin and Destination Nodes Reply #2 - Dec 23^rd, 2022 at 4:55am	Print Post
	Thanks! I got it to work.


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