Bugfix: loading theme options

src/components/ThemeModal.astro

@@ -64,15 +64,16 @@ import TextBox from "./TextBox.astro";
 <script>
     var lessLoaded = false
 
-    class ThemingOption {
+    class ThemingOption<T> {
         input: HTMLInputElement | undefined
+        value: T;
         onchange:
-            (opt: ThemingOption, upd: boolean) => any =
+            (opt: ThemingOption<T>, upd: boolean) => any =
             (_opt, _upd) => {}
 
         constructor (
             inputId: string,
-            onchange: (opt: ThemingOption, upd: boolean) => any
+            onchange: (opt: ThemingOption<T>, upd: boolean) => any
         ) {
             this.input = document.getElementById(inputId) as HTMLInputElement
             this.onchange = onchange
@@ -103,6 +104,15 @@ import TextBox from "./TextBox.astro";
         }
     }
 
+    /** Converts any object to number.
+     *  Returns the default value passed to `def` parameter
+     *  if `Number(val)` returns `NaN`.
+     */
+    const toNum = (val: any, def: number) => {
+        const res = Number(val)
+        return isNaN(res) ? def : res
+    }
+
     const colorRegex = /#?([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/
     /** Parses color-like string and
      *  returns the color in the general format.
@@ -114,11 +124,12 @@ import TextBox from "./TextBox.astro";
         return (val.match(colorRegex) || [])[1]
     }
     
-    new ThemingOption(
+    new ThemingOption<boolean>(
         'dark',
         (opt, upd) => {
             if (upd) {
                 const state = opt.input.checked
+                opt.value = state
                 localStorage.setItem('dc09_dark', state ? '1' : '0')
                 return opt.onchange(opt, false)
             }
@@ -132,70 +143,81 @@ import TextBox from "./TextBox.astro";
                     media.matches
                 )
             )
+            opt.value = state
             opt.input.checked = state
             document.body.dataset.dark = state ? '1' : '0'
         }
     )
 
-    const purebgOpt = new ThemingOption(
+    const purebgOpt = new ThemingOption<boolean>(
         'purebg',  // pure background
         (opt, upd) => {
             if (upd) {
                 const state = opt.input.checked
+                opt.value = state
                 localStorage.setItem('dc09_purebg', state ? '1' : '0')
                 reloadTheme()
                 return opt.onchange(opt, false)
             }
 
-            opt.input.checked = toBool(localStorage.getItem('dc09_purebg'))
+            const value = toBool(localStorage.getItem('dc09_purebg'))
+            opt.value = value
+            opt.input.checked = value
         }
     )
 
-    const accentOpt = new ThemingOption(
+    const accentOpt = new ThemingOption<string>(
         'accent',
         (opt, upd) => {
             if (upd) {
                 if (!opt.input.validity.valid) return
                 const color = toColor(opt.input.value)
                 if (!color) return
+                opt.value = color
                 localStorage.setItem('dc09_accent', color)
                 reloadTheme()
                 return
             }
 
-            const color = localStorage.getItem('dc09_accent') || '6570d6'
+            const color = toColor(localStorage.getItem('dc09_accent')) || '6570d6'
+            opt.value = color
             opt.input.value = color
         }
     )
 
-    const bdrsOpt = new ThemingOption(
+    const bdrsOpt = new ThemingOption<number>(
         'bdrs',  // border-radius, as in Emmet
         (opt, upd) => {
             if (upd) {
-                const value = opt.input.value
-                localStorage.setItem('dc09_bdrs', value)
+                const valueStr = opt.input.value
+                const value = Number(opt.input.value)
+                if (isNaN(value)) return;
+                opt.value = value
+                localStorage.setItem('dc09_bdrs', valueStr)
                 reloadTheme()
                 return
             }
 
-            let value = Number(localStorage.getItem('dc09_bdrs'))
-            value = isNaN(value) ? 2 : value
+            const value = toNum(localStorage.getItem('dc09_bdrs'), 2)
+            opt.value = value
             opt.input.value = String(value)
             opt.input.dispatchEvent(new Event('updatedByJavascript'))
         }
     )
 
     const colorsSection = document.getElementById('custom-colors')
-    new ThemingOption(
+    new ThemingOption<boolean>(
         'custom-theme',
         (opt, upd) => {
             if (upd) {
                 const state = opt.input.checked
+                opt.value = state
                 localStorage.setItem('dc09_custom', state ? '1' : '0')
                 return opt.onchange(opt, false)
             }
 
             const state = toBool(localStorage.getItem('dc09_custom'))
+            opt.value = state
             opt.input.checked = state
             colorsSection.dataset.show = state ? '1' : '0'
 
@@ -225,9 +247,9 @@ import TextBox from "./TextBox.astro";
     }
 
     function reloadTheme() {
-        const accent = '#' + toColor(accentOpt.input.value)
-        const bdrs = Number(bdrsOpt.input.value)
-        const purebg = purebgOpt.input.checked
+        const accent = '#' + accentOpt.value
+        const bdrs = bdrsOpt.value
+        const purebg = purebgOpt.value
         eval('less').modifyVars({
             accent: accent,
             bdrs: `${bdrs}rem`,