From afeacc71a58c5d9e234a2c9898ede28db1020049 Mon Sep 17 00:00:00 2001
From: Alghazali Abdulrahman <40702435+DrAlghazali@users.noreply.github.com>
Date: Thu, 26 Jan 2023 11:44:39 +0300
Subject: [PATCH] lengthMenu

---
 js/core/core.length.js | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/js/core/core.length.js b/js/core/core.length.js
index 04785eaa1..4cb393b79 100644
--- a/js/core/core.length.js
+++ b/js/core/core.length.js
@@ -1,8 +1,15 @@
 
 function _fnLengthChange ( settings, val )
 {
-	var len = parseInt( val, 10 );
-	settings._iDisplayLength = len;
+	// val: is coming directily from the dom 
+	var len = parseInt(val, 10),
+	    //Add a way to prevent end user from changing the lengthMenu value in the dom
+	    menu = settings.aLengthMenu,
+	    d2 = Array.isArray(menu[0]),
+	    originalLengths = d2 ? menu[0] : menu;
+	// if the value is not in the original values when initiating the data table then choose the min value
+	// this will be of use when using ssp whith large tables where you want to make sure that there is a LIMIT restriction
+	settings._iDisplayLength = originalLengths.includes(len) ? len : Math.min(...originalLengths);
 
 	_fnLengthOverflow( settings );