Manipulator: Add JSON parse support (#35077)

Support parsing JSON from each component's main element using the `data-bs-config` attribute.

The `bs-config` attribute will be reserved and omitted during `getDataAttributes` parsing.

With this commit, every component, will create its config object, using:

* defaults
* data-bs-config
* the rest of data attributes
* configuration object given during instance initialization

Co-authored-by: XhmikosR <xhmikosr@gmail.com>
Co-authored-by: Mark Otto <markd.otto@gmail.com>
Co-authored-by: Mark Otto <markdotto@gmail.com>

js/src/dom/manipulator.js

@@ -22,7 +22,15 @@ function normalizeData(value) {
     return null
   }
 
-  return value
+  if (typeof value !== 'string') {
+    return value
+  }
+
+  try {
+    return JSON.parse(decodeURIComponent(value))
+  } catch {
+    return value
+  }
 }
 
 function normalizeDataKey(key) {
@@ -44,7 +52,7 @@ const Manipulator = {
     }
 
     const attributes = {}
-    const bsKeys = Object.keys(element.dataset).filter(key => key.startsWith('bs'))
+    const bsKeys = Object.keys(element.dataset).filter(key => key.startsWith('bs') && !key.startsWith('bsConfig'))
 
     for (const key of bsKeys) {
       let pureKey = key.replace(/^bs/, '')

js/src/util/config.js

@@ -38,8 +38,11 @@ class Config {
   }
 
   _mergeConfigObj(config, element) {
+    const jsonConfig = isElement(element) ? Manipulator.getDataAttribute(element, 'config') : {} // try to parse
+
     return {
       ...this.constructor.Default,
+      ...(typeof jsonConfig === 'object' ? jsonConfig : {}),
       ...(isElement(element) ? Manipulator.getDataAttributes(element) : {}),
       ...(typeof config === 'object' ? config : {})
     }