Is there a way to rewrite "Connection" rules?

Hi,

I would like to make specific Connection rules. For example, node A can only connect to Node B, and if it wants to connect to Node C, the state of Connection should be isInDanger.

[LukasLoeffler]

Congrats that you solved it by yourself! Just beeing nitpicky here: You could use the array.some() method instead the array.forEach() loop. The array.some() method checks if the provided statement matches at least once on one of the elements in the array.

let flag = !nodesOnEditor.some((val)=>nodename == "myNodeName" && val.name == "myNodeName"))

This makes the code more readable and consice (at least in my opinion)

[Halinen]

I have solved it 😀

checkNodeCount(nodename) {
      let nodesOnEiditor = toRaw(this.$refs.editor.nodes)
      let flag = true
      nodesOnEiditor.forEach((val)=>{
        if(nodename == "myNodeName" && val.name == "myNodeName"){
          flag = false
          return
        }
      })
      return flag
}
 

this.viewPlugin.editor.events.beforeAddNode.addListener(this, (node) => {

      if(this.checkNodeCount(node.name)){
        if(node.name == "myNodeName" ){
          //contextMenu disabled 
          this.$refs.editor.contextMenu.items[0].submenu[2].disabled = true
        }
        return true
      }
      else{
        return false;
      }
    });