setAttributes in Google Doc header failing - setAttibutes is not a function - google-apps-script

Question

I want to set the font size in a google doc header, but I get the error 'setAttributes is not a function'. I can't really understand the structure of a header (it seems), as to where to set the attributes.
var style = {};
style[DocumentApp.Attribute.FONT_SIZE] = 16;
style[DocumentApp.Attribute.BOLD] = true;
var range = this.Doc.getHeader(
range.setText(text)
var m = range.getNumChildren();
for (var i =0; i<m;i++){
var cld = range.getChild(i);
var ct = cld.getText();
var cat = cld.getAttributes();
cld.setAttibutes(style);
}
In the code above I can set the text in the header, and I can see the text in the 1st child element "ct", but I can't set the attributes. cld.getAttributes() returns nulls, so I'm thinking the attributes are set on a higher element. I just don't know which.

Answer 1

Issue:
getChild returns element, not Text, thus you need to change cld to Text via asText and then use getText().
As for the setAttributes function, I didn't encounter the issue you had, it just worked so I have no clue on why it errors on yours.
Can you try this one?
Code:
function updateHeader() {
var doc = DocumentApp.getActiveDocument();
var range = doc.getHeader();
var text = "this is the new header";
var style = {};
style[DocumentApp.Attribute.FONT_SIZE] = 16;
style[DocumentApp.Attribute.BOLD] = true;
var m = range.getNumChildren();
for (var i = 0; i < m; i++){
var cld = range.getChild(i);
var ct = cld.asText().getText(); // get text value
var cat = cld.getAttributes(); // get attributes
Logger.log(ct); // print old text
Logger.log(cat); // print old attributes
cld.asText().setText(text); // set text as header value
cld.setAttributes(style); // set attributes
Logger.log(cld.asText().getText()); // print new text
Logger.log(cld.getAttributes()); // print new attributes
}
}
Sample:
Output:
Logs:
Note:
I placed setText inside the loop to show you the difference of before and after the update of the value of the text and attribute.