From 7e226e5ff75b9160ff96b38f6521e3e57b8f751a Mon Sep 17 00:00:00 2001
From: cl199793 <cl199793@alibaba-inc.com>
Date: Fri, 5 Jul 2019 14:01:46 +0800
Subject: [PATCH 1/2] add feature

---
 .../cascader-panel/src/cascader-panel.vue     | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/packages/cascader-panel/src/cascader-panel.vue b/packages/cascader-panel/src/cascader-panel.vue
index 3ac558f6a0..945a910778 100644
--- a/packages/cascader-panel/src/cascader-panel.vue
+++ b/packages/cascader-panel/src/cascader-panel.vue
@@ -79,6 +79,8 @@ const checkNode = el => {
   }
 };
 
+let loadCount = 0;
+
 export default {
   name: 'ElCascaderPanel',
 
@@ -294,6 +296,24 @@ export default {
         dataList && dataList.length && this.store.appendNodes(dataList, parent);
         node.loading = false;
         node.loaded = true;
+
+        // dispose default value on lazy load mode
+        if (this.checkedValue && Array.isArray(this.checkedValue)) {
+          const nodeValue = this.checkedValue.slice(loadCount++).shift();
+          const valueKey = this.config.value;
+
+          if (Array.isArray(dataList) && dataList.filter(item => item[valueKey] === nodeValue).length > 0) {
+            const checkedNode = this.store.getNodeByValue(nodeValue);
+            this.lazyLoad(checkedNode, () => {
+              this.handleExpand(checkedNode);
+            });
+
+            if (loadCount === this.checkedValue.length) {
+              this.$parent.computePresentText();
+            }
+          }
+        }
+
         onFullfiled && onFullfiled(dataList);
       };
       config.lazyLoad(node, resolve);

From 231244f7531ce9e68a27f158a792ca9f6f4dc5ab Mon Sep 17 00:00:00 2001
From: cl199793 <cl199793@alibaba-inc.com>
Date: Mon, 8 Jul 2019 19:49:31 +0800
Subject: [PATCH 2/2] fix review issue

---
 .../cascader-panel/src/cascader-panel.vue     | 21 +++++++++++--------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/packages/cascader-panel/src/cascader-panel.vue b/packages/cascader-panel/src/cascader-panel.vue
index 945a910778..ba5c1dccd5 100644
--- a/packages/cascader-panel/src/cascader-panel.vue
+++ b/packages/cascader-panel/src/cascader-panel.vue
@@ -79,8 +79,6 @@ const checkNode = el => {
   }
 };
 
-let loadCount = 0;
-
 export default {
   name: 'ElCascaderPanel',
 
@@ -111,7 +109,8 @@ export default {
       checkedNodePaths: [],
       store: [],
       menus: [],
-      activePath: []
+      activePath: [],
+      loadCount: 0
     };
   },
 
@@ -298,17 +297,21 @@ export default {
         node.loaded = true;
 
         // dispose default value on lazy load mode
-        if (this.checkedValue && Array.isArray(this.checkedValue)) {
-          const nodeValue = this.checkedValue.slice(loadCount++).shift();
+        if (Array.isArray(this.checkedValue)) {
+          const nodeValue = this.checkedValue[this.loadCount++];
           const valueKey = this.config.value;
+          const leafKey = this.config.leaf;
 
           if (Array.isArray(dataList) && dataList.filter(item => item[valueKey] === nodeValue).length > 0) {
             const checkedNode = this.store.getNodeByValue(nodeValue);
-            this.lazyLoad(checkedNode, () => {
-              this.handleExpand(checkedNode);
-            });
 
-            if (loadCount === this.checkedValue.length) {
+            if (!checkedNode.data[leafKey]) {
+              this.lazyLoad(checkedNode, () => {
+                this.handleExpand(checkedNode);
+              });
+            }
+
+            if (this.loadCount === this.checkedValue.length) {
               this.$parent.computePresentText();
             }
           }