I have installed LimeSurvey 3.4 and tried to add this code to my question:

<script type="text/javascript" charset="utf-8">
$(document).ready(function() {
$('#question{QID} input[type="text"]').autocomplete({
minLength: 2,
source: ["Test1","Test2","Test3"]
});
});
</script>

but autocomplete is not working and I have this error in Console:

TypeError: undefined is not a function (near '...$('#question2 input[type="text"]').autocomplete...')

In the workarounds it says that "Note that the Autocomplete widget is already included in LimeSurvey, as part of jQuery UI." so I was expecting autocomplete to work by default.

Should I need to add anything to my installation?

jQuery-UI (which includes the autocomplete widget) is not included in the core themes for 3.4.x. You need to add it to a custom theme.

1) Extend a core theme as described here - www.limesurvey.org/manual/New_Template_System_in_LS3.x .

2) Download jQuery-UI - jqueryui.com/download/ . Extract the files.

3) Upload the extracted jquery-ui.min.js to /upload/themes/survey/yourThemeName/scripts/.

4) Upload the extracted jquery-ui.min.css to /upload/themes/survey/yourThemeName/css/.

5) Register the new files by including them in the <files> block of /upload/themes/survey/yourThemeName/config.xml something like this:
6) Uninstall and re-install your new theme to reload the config settings.

7) Clear your cache and retest survey.

thank you for your time, much appreciated.

jquery-ui is present in the directory structure of LS3.4 and LS3.5, in the third_party folder, so I assumed that to be loaded... your hint was precious!

hovewer, after following all of the passages you outlined, I have these errors, that prevent me to fix my issue:

[Error] Failed to load resource: the server responded with a status of 404 (Not Found) (ajaxify.css, line 0)
[Error] Failed to load resource: the server responded with a status of 404 (Not Found) (jquery-ui.min.css, line 0)
[Error] Failed to load resource: the server responded with a status of 404 (Not Found) (jquery-ui.min.js, line 0)

the files are present in the /upload/themes/survey/mytheme/css and /upload/themes/survey/mytheme/scripts and alsto the /upload/themes/survey/mytheme/config.xml has been updated, so I guess I am still missing sometihng to solve the puzzle...

Did you uninstall and re-install your new theme?

yes I idid

Try with this survey and template. (import the template first)

Template:

Survey:

I am afraid the link of the template is not working...

Sorry, the forum uploading is broken - I can't help with that.

one very strange thing is that, in the advanced options for the new theme, I have:

{"add":["css\/ajaxify.css","css\/animate.css","css\/variations\/sea_green.css","css\/theme.css","css\/custom.css","css\/jquery-ui.min.css"]}

{"add":["scripts\/theme.js","scripts\/ajaxify.js","scripts\/custom.js","scripts\/jquery-ui.min.js","scripts\/jquery.csv.js"]}

{"add":["css\/print_theme.css"]}

Is it normal to have the "\/" sequence? it looks like an escape, but the other templates don't have that

of course I removed the escape and tried again, but with no avail.

it's interesting that everytime I disinstall the theme and reinstall it, the escapes came back...

any chance it is working now? thanks

ok, solved!

I had to clear from Global Settings -> General -> Clear asset cache...

thanks for all the help, I have learned a lot!