PrimeNg Organization Chart refresh programmatically

Question

I am using p-organizationChart to display hierarchy. I am adding child dynamically. After adding child, it's not displaying expand arrow, but when I select any Node then it reflects.

So, I would like to refresh this org-chart programmatically.

Any suggestions?

 <p-organizationChart [value]="programStructure" styleClass="company" selectionMode="single" [(selection)]="selectedParentProgram" #chart [preserveSpace]="false">
</p-organizationChart>

Adding Child:

addChildNode() {
    this.selectedParentProgram.children.push({
        label: this.selectedChildProgram.name,
        type: 'node',
        expanded: true,
        data: {
            'programId': this.selectedChildProgram.id,
            'versionId': this.selectedProgramVersion.id
        },
        children: []
    });
    this.isAddProgramDialogShown = false;
    this.clear();
  }

This code works perfectly as expected. But, chart not getting updated unless I select/unselect any node.

Solution Worked for me

this.cd.detectChanges();

Please show how you are adding the child.

Barremian
– Barremian

2021-05-21 11:05:18 +00:00
Commented May 21, 2021 at 11:05 — Barremian
– Barremian, Commented May 21, 2021 at 11:05
@MichaelD Added "Adding Child" code above

Vaibhav Sawant
– Vaibhav Sawant

2021-05-21 11:14:38 +00:00
Commented May 21, 2021 at 11:14 — Vaibhav Sawant
– Vaibhav Sawant, Commented May 21, 2021 at 11:14

Barremian · Accepted Answer · 2021-05-21 11:24:31Z

1

Angular change detection is usually triggered when the reference to an object changes. Adding elements to an array using it's push method wouldn't change the array's reference. Instead you could try to re-assign the variable using the spread syntax.

Try the following

addChildNode() {
  const child = {
    label: this.selectedChildProgram.name,
    type: 'node',
    expanded: true,
    data: {
      'programId': this.selectedChildProgram.id,
      'versionId': this.selectedProgramVersion.id
    },
    children: []
  };
  
  this.selectedParentProgram = {
    ...this.selectedChildProgram,
    children: [
      ...this.selectedChildProgram.children, 
      child
    ]
  };
  this.isAddProgramDialogShown = false;
  this.clear();
}

answered May 21, 2021 at 11:24

Barremian

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2 Comments

Vaibhav Sawant Over a year ago

Thanks for explanation. Based on above added below line of code and it worked. Thanks a lot. this.cd.detectChanges();

Barremian Over a year ago

@VaibhavSawant: Yes that would be the other alternative. To manually trigger the change detection when needed.

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