doc: save user preference for JS flavor

PR-URL: #49526Fixes: #49508
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

Author: eldoy

doc/api_assets/api.js

@@ -136,6 +136,29 @@
 updateHashes();
 }
 
+functionsetupFlavorToggles(){
+constkFlavorPreference='customFlavor';
+constflavorSetting=localStorage.getItem(kFlavorPreference)==='true';
+constflavorToggles=document.querySelectorAll('.js-flavor-toggle');
+
+flavorToggles.forEach((toggleElement)=>{
+toggleElement.checked=flavorSetting;
+toggleElement.addEventListener('change',(e)=>{
+constchecked=e.target.checked;
+
+if(checked){
+localStorage.setItem(kFlavorPreference,true);
+}else{
+localStorage.removeItem(kFlavorPreference);
+}
+
+flavorToggles.forEach((el)=>{
+el.checked=checked;
+});
+});
+});
+}
+
 functionsetupCopyButton(){
 constbuttons=document.querySelectorAll('.copy-button');
 buttons.forEach((button)=>{
@@ -182,6 +205,8 @@
 // Make link to other versions of the doc open to the same hash target (if it exists).
 setupAltDocsLink();
 
+setupFlavorToggles();
+
 setupCopyButton();
 }