launch js event when initializing dropzone

CHANGELOG.md

@@ -22,4 +22,5 @@ Version 1.5.3
 ===============
 
 - replace default message on download button below dropzone ;
+- launch event when dropzone is initialized, to allow to customize events on dropzone; 
 

Resources/public/module/async_upload/uploader.js

@@ -2,6 +2,25 @@ var algo = 'AES-CBC';
 var Dropzone = require('dropzone');
 var initializeDownload = require('./downloader.js');
 
+
+/**
+ * 
+ * define a dropzone for chill usage
+ * 
+ * An event is launched when dropzone is initialize, allowing to customize events 
+ * on dropzone :
+ * 
+ * ```
+ * window.addEventListener("chill_dropzone_initialized", (e) => {
+ *    // do something with dropzone:
+ *    e.detail.dropzone.on("success", (e) => {
+ *      // see https://www.dropzonejs.com/#event-success
+ *    });
+ * });
+ * ```
+ * 
+ */
+
 // load css
 //require('dropzone/dist/basic.css');
 require('dropzone/dist/dropzone.css');
@@ -139,6 +158,14 @@ var initialize = function(zone) {
     zone.insertBefore(created, zone.firstChild);
     
     insertDownloadButton(zone, zoneData);
+    
+    let event = new CustomEvent("chill_dropzone_initialized", {
+        detail: {
+            dropzone: dropzoneI,
+            zoneData: zoneData
+        }
+    });
+    window.dispatchEvent(event);
 };
 
 var createFilename = () => {