[GH-ISSUE #1781] Change default charset UTF-8 #1499

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opened 2026-02-28 01:30:19 +03:00 by kerem · 4 comments

kerem commented

2026-02-28 01:30:19 +03:00

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Originally created by @mylms on GitHub (Nov 19, 2024).
Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1781

Is it possible change default charset from UTF-8 to ISO-8859-2? I use this encodig in VS Code (because encoding chars for external display).
I would like to get some texts from WiFi portal to ESP32 and there is some problems with decoding letters á, č, ď, é, ě, í, ň, ó, ř, š, ť, ú, ů, ý, ž, Á, Č, Ď, É, Ě, Í, Ň, Ó, Ř, Š, Ť, Ú, Ů, Ý, Ž

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Originally created by @mylms on GitHub (Nov 19, 2024). Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1781 Is it possible change default charset from UTF-8 to ISO-8859-2? I use this encodig in VS Code (because encoding chars for external display). I would like to get some texts from WiFi portal to ESP32 and there is some problems with decoding letters á, č, ď, é, ě, í, ň, ó, ř, š, ť, ú, ů, ý, ž, Á, Č, Ď, É, Ě, Í, Ň, Ó, Ř, Š, Ť, Ú, Ů, Ý, Ž ThankYou

kerem commented

2026-02-28 01:30:19 +03:00

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@tablatronix commented on GitHub (Nov 20, 2024):

You mean the web browser? You can add a header

@tablatronix commented on GitHub (Nov 20, 2024): You mean the web browser? You can add a header

kerem commented

2026-02-28 01:30:19 +03:00

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@mylms commented on GitHub (Nov 20, 2024):

Thank you for your advice. Yes, I mean in web browser. I try to add
wm.setCustomHeadElement("<meta charset='ISO-8859-2'>");

But anfortunatelly no change. Diacritic chars not working.

@mylms commented on GitHub (Nov 20, 2024): Thank you for your advice. Yes, I mean in web browser. I try to add `wm.setCustomHeadElement("<meta charset='ISO-8859-2'>");` But anfortunatelly no change. Diacritic chars not working. ![Screenshot_20241120-095557](https://github.com/user-attachments/assets/31809e8d-e08b-409f-bbdc-6a490a7d9e32)

kerem commented

2026-02-28 01:30:19 +03:00

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@mylms commented on GitHub (Nov 20, 2024):

Here is code of webpage. I can't paste it directly.

If I change charset directly in "wm_consts_en.h" everything works properly.

@mylms commented on GitHub (Nov 20, 2024): Here is code of webpage. I can't paste it directly. ![wifimngr_code](https://github.com/user-attachments/assets/c871f408-431a-45c8-971c-13bc6dce17e1) If I change charset directly in "wm_consts_en.h" everything works properly.

kerem commented

2026-02-28 01:30:19 +03:00

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@assanges commented on GitHub (Jan 22, 2025):

Thank you for your advice. Yes, I mean in web browser. I try to add wm.setCustomHeadElement("<meta charset='ISO-8859-2'>");

But anfortunatelly no change. Diacritic chars not working.

Are you modifying the wm_strings_en.h file?

Not sure if this will work but it's worth a try since I don't have an ESP board beside me.

Try to modify Line 28 in the i18n file (i.e., wm_string_en.h:28 or any self-created i18n file),
the charset in the HTML file was a hardcoded string, adding a custom HTML Head element would not work as you think.

const char WM_LANGUAGE[] PROGMEM = "en-US"; // i18n lang code (you might want to change this to "cs-CZ")

const char HTTP_HEAD_START[]       PROGMEM = "<!DOCTYPE html>"
"<html lang='en'><head>"
"<meta name='format-detection' content='telephone=no'>"
"<meta charset='UTF-8'>" // MODIFY CHARSET HERE, i.e. 'ISO-8859-2'
"<meta  name='viewport' content='width=device-width,initial-scale=1,user-scalable=no'/>"
"<title>{v}</title>";

@assanges commented on GitHub (Jan 22, 2025): > Thank you for your advice. Yes, I mean in web browser. I try to add `wm.setCustomHeadElement("<meta charset='ISO-8859-2'>");` > > But anfortunatelly no change. Diacritic chars not working. > > ![Screenshot_20241120-095557](https://github.com/user-attachments/assets/31809e8d-e08b-409f-bbdc-6a490a7d9e32) Are you modifying the [`wm_strings_en.h`](../blob/master/wm_strings_en.h) file? Not sure if this will work but it's worth a try since I don't have an ESP board beside me. Try to modify Line 28 in the i18n file (i.e., [`wm_string_en.h:28`](../blob/master/wm_strings_en.h#L28) or any self-created i18n file), the charset in the HTML file was a hardcoded string, adding a custom HTML Head element would not work as you think. ``` const char WM_LANGUAGE[] PROGMEM = "en-US"; // i18n lang code (you might want to change this to "cs-CZ") const char HTTP_HEAD_START[] PROGMEM = "<!DOCTYPE html>" "<html lang='en'><head>" "<meta name='format-detection' content='telephone=no'>" "<meta charset='UTF-8'>" // MODIFY CHARSET HERE, i.e. 'ISO-8859-2' "<meta name='viewport' content='width=device-width,initial-scale=1,user-scalable=no'/>" "<title>{v}</title>"; ```