@dublove The best I could do is to use Action code. Unfortunately, it is a bit of a hack, but I cannot think of any other way.
— Mark
/**
* @file Auto Size Selected TextFrame.js
*
* Invoke the "Auto Size" area text option on the selected text frame(s).
*
* @author m1b
* @version 2026-05-19
* @discussion https://community.adobe.com/questions-652/how-to-enable-the-auto-resize-function-under-the-preferences-and-regional-text-options-1623882
*/
(function () {
if (
0 === app.documents.length
|| 0 === app.activeDocument.selection.length
)
return alert('Please select one or more text frames and try again.');
const KEEP_AUTOSIZE_ON = false;
autoSizeSelectedTextFrames(KEEP_AUTOSIZE_ON);
})();
/**
* Auto-sizes the given `textFrames`.
* @param {Boolean} [keepOn] - whether to leave Auto Size turned ON (default: true).
*/
function autoSizeSelectedTextFrames(keepOn) {
// this is the .aia markup to invoke "Auto Size" in Area Text Options
const AUTOSIZE_AREATEXT_OPTIONS_AIA_AND_KEEP_ON = '/version 3 /name [ 4 54656d70 ] /isOpen 1 /actionCount 1 /action-1 { /name [ 8 416374696f6e2031 ] /keyIndex 0 /colorIndex 0 /isOpen 0 /eventCount 1 /event-1 { /useRulersIn1stQuadrant 0 /internalName (adobe_SLOAreaTextDialog) /localizedName [ 17 417265612054797065204f7074696f6e73 ] /isOpen 0 /isOn 1 /hasDialog 0 /parameterCount 1 /parameter-1 { /key 1952539754 /showInPalette 4294967295 /type (integer) /value 1 } } }';
const AUTOSIZE_AREATEXT_OPTIONS_AIA_AND_KEEP_OFF = '/version 3 /name [ 4 54656d70 ] /isOpen 1 /actionCount 1 /action-1 { /name [ 8 416374696f6e2031 ] /keyIndex 0 /colorIndex 0 /isOpen 0 /eventCount 2 /event-1 { /useRulersIn1stQuadrant 0 /internalName (adobe_SLOAreaTextDialog) /localizedName [ 17 417265612054797065204f7074696f6e73 ] /isOpen 0 /isOn 1 /hasDialog 0 /parameterCount 1 /parameter-1 { /key 1952539754 /showInPalette 4294967295 /type (integer) /value 1 } } /event-2 { /useRulersIn1stQuadrant 0 /internalName (adobe_SLOAreaTextDialog) /localizedName [ 17 417265612054797065204f7074696f6e73 ] /isOpen 0 /isOn 1 /hasDialog 0 /parameterCount 1 /parameter-1 { /key 1952539754 /showInPalette 4294967295 /type (integer) /value 2 } } }';
var aia = keepOn
? AUTOSIZE_AREATEXT_OPTIONS_AIA_AND_KEEP_ON
: AUTOSIZE_AREATEXT_OPTIONS_AIA_AND_KEEP_OFF;
// invoke the auto-size
doActionFromString(aia);
};
/**
* Create and execute an action using the markup supplied.
*
* Loads the .aia into a "DeleteMeNNNNN" action set,
* which will be unloaded after running.
*
* Example of .aia markup:
* const AUTOSIZE_AREATEXT = '/version 3 /name [ 4 54656d70 ] /isOpen 1 /actionCount 1 /action-1 { /name [ 8 416374696f6e2031 ] /keyIndex 0 /colorIndex 0 /isOpen 0 /eventCount 1 /event-1 { /useRulersIn1stQuadrant 0 /internalName (adobe_SLOAreaTextDialog) /localizedName [ 17 417265612054797065204f7074696f6e73 ] /isOpen 0 /isOn 1 /hasDialog 0 /parameterCount 1 /parameter-1 { /key 1952539754 /showInPalette 4294967295 /type (integer) /value 1 } } }';
*
* @author m1b (and thanks to Charu Rajput for initial idea of loading a temporary aia).
* @version 2026-05-19
* @param {String} aia - the action markup.
*/
function doActionFromString(aia) {
// replace the set name with a unique throwaway name to avoid collisions
var setNameHex = encodeHex('DeleteMe' + Math.floor(Math.random() * 99999 + 1));
aia = aia.replace(/\/name \[ [0-9]+ [0-9a-f]+ \]/, '/name [ ' + (setNameHex.length / 2) + ' ' + setNameHex + ' ]');
var findName = /\/name\s\[ [0-9]+ ([0-9a-f]+) \]/g;
var setName = decodeHex(findName.exec(aia)[1]);
var actionName = decodeHex(findName.exec(aia)[1]);
try {
// save temp action, load it, do it, unload it, delete it
var tmp = File(Folder.temp + '/' + setName + '.aia');
tmp.open('w');
tmp.write(aia);
tmp.close();
app.loadAction(tmp);
app.doScript(actionName, setName, false);
}
catch (error) {
alert('Script failed: ' + error.message);
}
finally {
app.unloadAction(setName, '');
tmp.remove();
}
};
/**
* Returns an ASCII string, given hexadecimal number.
* @param {String} hex - the hexadecimal to decode.
* @returns {String} - the decoded string.
*/
function decodeHex(hex) {
var result = '';
for (var i = 0; i < hex.length; i += 2)
result += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
return result;
};
/**
* Returns a hexadecimal string encoding of an ASCII string.
* @param {String} str - the string to encode.
* @returns {String} - the hex-encoded string.
*/
function encodeHex(str) {
var result = '';
for (var i = 0; i < str.length; i++) {
var code = str.charCodeAt(i).toString(16);
result += (code.length < 2 ? '0' : '') + code;
}
return result;
};
Edit 2026-05-19: added better error handling and documentation.
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