From 7bf345e03346fcd4ebc5acce6c2f1d282134d2eb Mon Sep 17 00:00:00 2001
From: Tian Jian <tianjianchn@qq.com>
Date: Tue, 10 Oct 2017 08:30:31 -0500
Subject: [PATCH] Fix: infinite call loadMore when height changes but not
 enough
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

修复以下情况下会导致无限调用 loadMore 的情况：
1. 当调用 loadMore，产生新的高度变化，但是这个高度不够 infinite-scroll-distance 时，导致再次调用 loadMore
2. 当调用 loadMore 时，由于底部有加载动作条渲染，而实际上又没有新的数据（比如接口返回零行），导致无限调用 loadMore

https://github.com/ElemeFE/vue-infinite-scroll/issues/35
https://github.com/ElemeFE/vue-infinite-scroll/issues/18
---
 src/directive.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/directive.js b/src/directive.js
index fefbed0..a955be3 100644
--- a/src/directive.js
+++ b/src/directive.js
@@ -172,6 +172,10 @@ var doCheck = function (force) {
 
     shouldTrigger = viewportBottom + distance >= elementBottom;
   }
+  
+  // If triggered last time, then ignore this as there is no enough height growth
+  if(this.shouldTrigger === shouldTrigger) return;
+  this.shouldTrigger = shouldTrigger;
 
   if (shouldTrigger && this.expression) {
     this.expression();