CODEWITHSUNDEEP
javascriptgoogle-apps-script
Senseful
Senseful

Reputation: 91931

How to check if Element is a ContainerElement?

I'm using Google Apps Scripting to iterate over a bunch of elements in a Google Doc. I start with a single Element and I want to recurse over all its children with code similar to the following:

var elements = [rootElement];
while (elements.length > 0) {
  var element = elements.pop();
  // TODO: process element
  if (isContainerElement(element)) {
    for (var i = 0; i < element.getNumChildren(); i++) {
      elements.push(element.getChild(i));
    }
  }
}

I don't know how to implement isContainerElement, though.

If I try the following:

function isContainerElement(element) {
  return element instanceof DocumentApp.ContainerElement
}

I get this error:

TypeError: Cannot use instanceof on a non-object.

How can I find out if an Element is a ContainerElement?

Upvotes: 1

Views: 301

Answers (1)

Senseful
Senseful

Reputation: 91931

There are probably better and more robust ways to do this, but this works:

function isContainerElement(element) {
  return element.getNumChildren !== undefined;
}

Upvotes: 1

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