增加报警信息推送请求和页面通知发布

web_src/src/components/UiHeader.vue

@@ -4,6 +4,7 @@
             <el-menu-item index="/">控制台</el-menu-item>
             <el-menu-item index="/videoList">设备列表</el-menu-item>
             <el-menu-item index="/parentPlatformList/15/1">国标级联</el-menu-item>
+            <el-switch v-model="alarmNotify"  active-text="报警信息推送" style="display: block float: right" @change="sseControl"></el-switch>
             <el-menu-item style="float: right;" @click="loginout">退出</el-menu-item>
         </el-menu>
 	</div>
@@ -12,14 +13,63 @@
 <script>
 export default {
     name: "UiHeader",
+    components: { Notification },
+    data() {
+        return {
+            alarmNotify: true,
+            sseSource: null,
+        };
+    },
     methods:{
-
   	    loginout(){
             // 删除cookie，回到登录页面
             this.$cookies.remove("session");
             this.$router.push('/login');
+            this.sseSource.close();
+        },
+        beforeunloadHandler() {
+            this.sseSource.close();
+        },
+        sseControl() {
+            let that = this;
+            if (this.alarmNotify) {
+                this.sseSource = new EventSource('/api/emit'); 
+        	    this.sseSource.addEventListener('message', function(evt) {
+                    that.$notify({
+                        title: '收到报警信息',
+                        dangerouslyUseHTMLString: true,
+                        message: evt.data,
+                        type: 'warning'
+                    });
+	                console.log("收到信息：" + evt.data);
+        	    });
+	            this.sseSource.addEventListener('open', function(e) {
+        	        console.log("SSE连接打开.");
+	            }, false);
+        	    this.sseSource.addEventListener('error', function(e) {
+	                if (e.target.readyState == EventSource.CLOSED) {
+	                    console.log("SSE连接关闭");
+        	        } else {
+	                    console.log(e.target.readyState);
+        	        }
+	            }, false);
+            } else {
+                this.sseSource.removeEventListener('open', null);
+                this.sseSource.removeEventListener('message', null);
+                this.sseSource.removeEventListener('error', null);
+                this.sseSource.close();
+            } 
+        }
+    },
+    mounted() {
+        window.addEventListener('beforeunload', e => this.beforeunloadHandler(e))
+        // window.addEventListener('unload', e => this.unloadHandler(e))
+        this.sseControl();
+    },
+    destroyed() {
+        window.removeEventListener('beforeunload', e => this.beforeunloadHandler(e))
+        // window.removeEventListener('unload', e => this.unloadHandler(e))
     },
  }
-}
 
 </script>