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Add any text in any position within a text entry!

It’s as usual the great @NigelG who has the solution. In the original post, his code is much easier to insert into a ‘Run javascript’ step from the ‘Toolbox’ plugin. I added a multiline input with the id ‘textarea’ and used this code in the Run Javascript step (written by Nigel) :

function insertAtCaret(areaId, text) {
	var txtarea = document.getElementById(areaId);
	if (!txtarea) { return; }

	var scrollPos = txtarea.scrollTop;
	var strPos = 0;
	var br = ((txtarea.selectionStart || txtarea.selectionStart == '0') ?
		"ff" : (document.selection ? "ie" : false ) );
	if (br == "ie") {
		txtarea.focus();
		var range = document.selection.createRange();
		range.moveStart ('character', -txtarea.value.length);
		strPos = range.text.length;
	} else if (br == "ff") {
		strPos = txtarea.selectionStart;
	}

	var front = (txtarea.value).substring(0, strPos);
	var back = (txtarea.value).substring(strPos, txtarea.value.length);
	txtarea.value = front + text + back;
	strPos = strPos + text.length;
	if (br == "ie") {
		txtarea.focus();
		var ieRange = document.selection.createRange();
		ieRange.moveStart ('character', -txtarea.value.length);
		ieRange.moveStart ('character', strPos);
		ieRange.moveEnd ('character', 0);
		ieRange.select();
	} else if (br == "ff") {
		txtarea.selectionStart = strPos;
		txtarea.selectionEnd = strPos;
		txtarea.focus();
	}

	txtarea.scrollTop = scrollPos;
	}

insertAtCaret('textarea', "foo");

Hello all! I have been looking for a long time for a solution to this issue. Found a solution.
Install this plugin