From 792ce901fe98307414965f015f2558e48aa648f4 Mon Sep 17 00:00:00 2001
From: Szymon Pachucki <szymon.pachucki@ibm.com>
Date: Sun, 24 Aug 2025 14:29:35 +0200
Subject: [PATCH 1/2] fix:  axisLabel.formatter does not receive indexs when
 using customValues

---
 src/coord/axisTickLabelBuilder.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/coord/axisTickLabelBuilder.ts b/src/coord/axisTickLabelBuilder.ts
index 1ca67f5558..a6166d3d62 100644
--- a/src/coord/axisTickLabelBuilder.ts
+++ b/src/coord/axisTickLabelBuilder.ts
@@ -132,8 +132,10 @@ export function createAxisLabels(axis: Axis, ctx: AxisLabelsComputingContext): {
         return {
             labels: zrUtil.map(ticks, numval => {
                 const tick = {value: numval};
+                const index = ticks.indexOf(numval);
+
                 return {
-                    formattedLabel: labelFormatter(tick),
+                    formattedLabel: labelFormatter(tick, index),
                     rawLabel: axis.scale.getLabel(tick),
                     tickValue: numval,
                     time: undefined as ScaleTick['time'] | NullUndefined,

From e192f497bb5f32b48beb9769f369d411ba20cb4d Mon Sep 17 00:00:00 2001
From: Szymon Pachucki <szymon.pachucki@ibm.com>
Date: Tue, 2 Sep 2025 20:17:11 +0200
Subject: [PATCH 2/2] test: added a test case

---
 test/axisLabel.html | 55 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/test/axisLabel.html b/test/axisLabel.html
index 16a08effb4..f50a7cb00f 100644
--- a/test/axisLabel.html
+++ b/test/axisLabel.html
@@ -46,6 +46,7 @@
         <div id="main4"></div>
         <div id="main5"></div>
         <div id="main6"></div>
+        <div id="main7"></div>
 
         <script>
 
@@ -479,5 +480,59 @@
                 });
             });
         </script>
+
+        <script>
+            require([
+                'echarts'
+            ], function (echarts) {
+                const xValues = [100, 183, 218, 333, 478];
+                const xLabels = xValues.map((x) => x * 5);
+
+                option = {
+                xAxis: {
+                    type: 'value',
+                    axisLine: {
+                    show: true,
+                    onZeroAxisIndex: 1
+                    },
+                    axisTick: {
+                    show: true,
+                    customValues: xValues
+                    },
+                    axisLabel: {
+                    customValues: xValues,
+                    formatter: function (val, index) {
+                        return xLabels[index].toString();
+                    }
+                    }
+                },
+                yAxis: {
+                    type: 'value'
+                },
+                series: [
+                    {
+                    data: [
+                        [100, 160],
+                        [150, 240],
+                        [183, 145],
+                        [200, 234],
+                        [218, 228],
+                        [252, 301],
+                        [300, 145],
+                        [333, 223],
+                        [345, 157],
+                        [478, 270]
+                    ],
+                    type: 'line'
+                    }
+                ]
+                };
+                var chart = testHelper.create(echarts, 'main7', {
+                    title: 'Should be able to use index for custom values of axis label',
+                    option
+                });
+            });
+
+        </script>
     </body>
 </html>