From 5bcd7d4ccc05d20ebbf628005361d9fe3aebbecd Mon Sep 17 00:00:00 2001
From: tiwarir <rahul.tiwari@netscout.com>
Date: Wed, 8 Jul 2026 14:26:38 -0400
Subject: [PATCH] fix(line): keep labels above lines. close #15679

---
 src/chart/line/LineView.ts       |  2 +-
 test/ut/spec/series/line.test.ts | 72 ++++++++++++++++++++++++++++++++
 2 files changed, 73 insertions(+), 1 deletion(-)
 create mode 100644 test/ut/spec/series/line.test.ts

diff --git a/src/chart/line/LineView.ts b/src/chart/line/LineView.ts
index 847a876495..5813f03fdc 100644
--- a/src/chart/line/LineView.ts
+++ b/src/chart/line/LineView.ts
@@ -1044,7 +1044,7 @@ class LineView extends ChartView {
                 points
             },
             segmentIgnoreThreshold: 2,
-            z2: 10
+            z2: 1
         });
 
         this._lineGroup.add(polyline);
diff --git a/test/ut/spec/series/line.test.ts b/test/ut/spec/series/line.test.ts
new file mode 100644
index 0000000000..7dc11b2e1a
--- /dev/null
+++ b/test/ut/spec/series/line.test.ts
@@ -0,0 +1,72 @@
+/*
+* Licensed to the Apache Software Foundation (ASF) under one
+* or more contributor license agreements.  See the NOTICE file
+* distributed with this work for additional information
+* regarding copyright ownership.  The ASF licenses this file
+* to you under the Apache License, Version 2.0 (the
+* "License"); you may not use this file except in compliance
+* with the License.  You may obtain a copy of the License at
+*
+*   http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing,
+* software distributed under the License is distributed on an
+* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+* KIND, either express or implied.  See the License for the
+* specific language governing permissions and limitations
+* under the License.
+*/
+
+import { EChartsType } from '@/src/echarts';
+import { createChart, getGraphicElements } from '../../core/utHelper';
+
+
+describe('line_series', function () {
+
+    let chart: EChartsType;
+
+    beforeEach(function () {
+        chart = createChart();
+    });
+
+    afterEach(function () {
+        chart.dispose();
+    });
+
+    it('should render line under labels from mixed series', function () {
+        chart.setOption({
+            animation: false,
+            xAxis: {
+                type: 'category',
+                data: ['A', 'B', 'C']
+            },
+            yAxis: {},
+            series: [
+                {
+                    type: 'bar',
+                    label: {
+                        show: true,
+                        position: 'top'
+                    },
+                    data: [120, 120, 120]
+                },
+                {
+                    type: 'line',
+                    showSymbol: false,
+                    data: [140, 100, 140]
+                }
+            ]
+        });
+
+        const barItem = getGraphicElements(chart, 'series', 0).find(el => el.name === 'item');
+        const barLabel = barItem && barItem.getTextContent();
+        const linePolyline = getGraphicElements(chart, 'series', 1).find(el => el.type === 'ec-polyline');
+
+        expect(barItem).toBeDefined();
+        expect(barLabel).toBeDefined();
+        expect(linePolyline).toBeDefined();
+
+        expect((linePolyline as any).z2).toBeLessThan((barLabel as any).z2);
+    });
+
+});