From 952708d8b13a3af01d63c10d9ab1b02de844411f Mon Sep 17 00:00:00 2001
From: Hadi Nategh <hnategh@gmail.com>
Date: Thu, 6 Sep 2018 16:03:48 +0200
Subject: [PATCH] * Mail: avoid to send so many requests when user tries to
 scroll on mail list via key up/down

---
 mail/js/app.js | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/mail/js/app.js b/mail/js/app.js
index ef3b1eea32..6ba7a4f8b0 100644
--- a/mail/js/app.js
+++ b/mail/js/app.js
@@ -70,6 +70,12 @@ app.classes.mail = AppJS.extend(
 	 */
 	W_INTERVALS:[],
 
+	/**
+	 *
+	 * @array of setted timeouts
+	 */
+	W_TIMEOUTS: [],
+
 	/**
 	 * Initialize javascript for this application
 	 *
@@ -1062,12 +1068,19 @@ app.classes.mail = AppJS.extend(
 				this.mail_selectedMails.push(_id);
 			}
 			var self = this;
-			// Request email body from server
-			IframeHandle.set_src(egw.link('/index.php',{menuaction:'mail.mail_ui.loadEmailBody',_messageID:_id}));
-			jQuery(IframeHandle.getDOMNode()).on('load', function(e){
-				self.resolveExternalImages (this.contentWindow.document);
-			});
 
+			// Try to avoid sending so many request when user tries to scroll on list
+			// via key up/down quite fast.
+			for (var t in this.W_TIMEOUTS) {window.clearTimeout(this.W_TIMEOUTS[t]);}
+			this.W_TIMEOUTS.push(window.setTimeout(function(){
+
+				console.log(_id);
+				// Request email body from server
+				IframeHandle.set_src(egw.link('/index.php',{menuaction:'mail.mail_ui.loadEmailBody',_messageID:_id}));
+				jQuery(IframeHandle.getDOMNode()).on('load', function(e){
+					self.resolveExternalImages (this.contentWindow.document);
+				});
+			}, 300));
 		}
 		if (dataElem.data['smime']) this.smimeAttachmentsCheckerInterval();
 		var messages = {};