feat(聊天页面): 改进消息列表加载和滚动体验

pages/chat/index.vue

@@ -14,7 +14,7 @@
         scroll-y
         :scroll-into-view="scrollToView"
         :scroll-top="scrollTop"
-        scroll-with-animation
+        :scroll-with-animation="!isLoading"
         :upper-threshold="20"
         @scroll="handleScroll"
         @scrolltoupper="handleScrollToUpper"
@@ -47,6 +47,19 @@
             </div>
           </div>
 
+          <!-- 上拉刷新loading -->
+          <view class="loading-more" v-if="isLoading">
+            <u-loading mode="circle" color="#4370fe"></u-loading>
+          </view>
+
+          <!-- 到顶部提示 -->
+          <view
+            class="no-more-data"
+            v-if="noMoreData && vuex_msgList && vuex_msgList.length"
+          >
+            <text>已经到顶了</text>
+          </view>
+
           <view
             v-for="(message, index) in vuex_msgList"
             :key="message.id"
@@ -171,8 +184,8 @@ export default {
       PageIndex: 1,
       PageSize: 20,
 
-      isLoadingHistory: false,
-      noMoreHistory: false,
+      isLoading: false,
+      noMoreData: false,
     };
   },
 
@@ -215,7 +228,7 @@ export default {
     // 监听最后一条消息的ID变化，滚动到底部
     lastMsgId(val) {
       if (!val) return;
-      if (this.isLoadingHistory) return;
+      if (this.isLoading) return;
       this.$nextTick(() => {
         this.scrollToBottom();
       });
@@ -283,11 +296,22 @@ export default {
 
     // 加载对话消息
     getMsgList() {
-      return this.$store.dispatch("fetchChatRecord", {
-        dialogueManagementId: this.vuex_msgUser.dialogueManagementId,
-        PageIndex: this.PageIndex,
-        PageSize: this.PageSize,
-      });
+      return this.$store
+        .dispatch("fetchChatRecord", {
+          dialogueManagementId: this.vuex_msgUser.dialogueManagementId,
+          PageIndex: this.PageIndex,
+          PageSize: this.PageSize,
+        })
+        .then((list) => {
+          console.log(list.length, "加载对话消息");
+
+          const len = Array.isArray(list) ? list.length : 0;
+          if (len === 0 && len < this.PageSize) {
+            this.noMoreData = true;
+            console.log("没有更多数据了", this.noMoreData);
+          }
+          return list;
+        });
     },
 
     handleScroll(e) {
@@ -298,25 +322,26 @@ export default {
 
     // 滚动到顶部，加载下一页历史消息
     handleScrollToUpper() {
-      if (this.isLoadingHistory || this.noMoreHistory) return;
+      if (this.isLoading || this.noMoreData) return;
 
-      this.isLoadingHistory = true;
+      this.isLoading = true;
       const beforeTop = this.currentScrollTop || 0;
       const beforeHeight = this.currentScrollHeight || 0;
-      this.PageIndex += 1;
+      const nextPageIndex = this.PageIndex + 1;
       this.scrollToView = "";
 
       this.$store
         .dispatch("fetchChatRecordNextPage", {
           dialogueManagementId: this.vuex_msgUser.dialogueManagementId,
-          PageIndex: this.PageIndex,
+          PageIndex: nextPageIndex,
           PageSize: this.PageSize,
         })
         .then((list) => {
           if (!list || !list.length) {
-            this.noMoreHistory = true;
+            this.noMoreData = true;
             return;
           }
+          this.PageIndex = nextPageIndex;
           this.$nextTick(() => {
             const query = uni.createSelectorQuery().in(this);
             query
@@ -331,12 +356,9 @@ export default {
               .exec();
           });
         })
-        .catch(() => {
-          this.PageIndex = Math.max(1, this.PageIndex - 1);
-        })
         .finally(() => {
           setTimeout(() => {
-            this.isLoadingHistory = false;
+            this.isLoading = false;
           }, 50);
         });
     },
@@ -448,18 +470,18 @@ export default {
       height: 100%;
       overflow-y: scroll;
 
-      // .loading-more {
-      //   text-align: center;
-      //   margin-bottom: 32rpx;
-      // }
+      .loading-more {
+        text-align: center;
+        margin-bottom: 32rpx;
+      }
 
-      // .no-more-data {
-      //   text-align: center;
-      //   font-size: 24rpx;
-      //   color: #999;
-      //   margin-bottom: 32rpx;
-      //   padding: 10rpx 0;
-      // }
+      .no-more-data {
+        text-align: center;
+        font-size: 24rpx;
+        color: #999;
+        margin-bottom: 32rpx;
+        padding: 10rpx 0;
+      }
 
       .teacher-info-card {
         background-color: #ffffff;