Indesign script: set background image behind a text with a certain paragraph style

Question

I was searching for a solution in Indesign to set a background image behind a text with a certain paragraph style. Unfortunately I did not find any yet. So I thought maybe you can help me out with a script where you:

• assign a paragraph style (let's say "chapter_head")

• search for its encounter in the whole document.

• cut text of the found item and paste it with the same style(or a copy of the style) into a new textframe

• load a picture behind the textframe ("small-frame.ai")

• group, and paste it to the position where we cut the text out

• repeat with all found elements

Thanks in advance! Edit: here as requested a picture of what I am aiming at

Answer 1

Here you go.

// find all headers with style 'header'
app.findGrepPreferences = NothingEnum.nothing;
app.findGrepPreferences.findWhat = '^.+$';
app.findGrepPreferences.appliedParagraphStyle = 'header';
var headers = app.activeDocument.findGrep();

// store contents of the headers in the array 'contents'
var contents = [];
while (headers.length) contents.push(headers.shift().contents);

// replace all the headers with placeholder from clipboard
app.changeGrepPreferences.changeTo = '~C';
app.activeDocument.changeGrep();

// change all '#placeholder#' with contents of the headers
app.findGrepPreferences = NothingEnum.nothing;
app.findGrepPreferences.findWhat = '#placeholder#';
var placeholders = app.activeDocument.findGrep();
while (contents.length) placeholders.pop().contents = contents.pop();

The script finds all the paragraphs with style 'header', changes them with contents of clipboard (a group: image + text '#placeholder#'), then finds and changes all the texts '#placeholder#' with contents of the headers.

Before:

After: