From e953f2ae1fb77e81b938def9e5e4c6996fa2f49a Mon Sep 17 00:00:00 2001
From: Davis Rens <166565828+davrens101@users.noreply.github.com>
Date: Sat, 31 Oct 2026 23:48:22 -0700
Subject: [PATCH 1/2] Fix tick prefixes and suffixes for explicit tick values

---
 draftlogs/pending_fix.md        |  1 +
 src/plots/cartesian/axes.js     |  2 +-
 test/jasmine/tests/axes_test.js | 34 +++++++++++++++++++++++++++++++++
 3 files changed, 36 insertions(+), 1 deletion(-)
 create mode 100644 draftlogs/pending_fix.md

diff --git a/draftlogs/pending_fix.md b/draftlogs/pending_fix.md
new file mode 100644
index 00000000000..9a87408c969
--- /dev/null
+++ b/draftlogs/pending_fix.md
@@ -0,0 +1 @@
+- Apply `tickprefix` and `ticksuffix` to `tickvals` without explicit `ticktext`
diff --git a/src/plots/cartesian/axes.js b/src/plots/cartesian/axes.js
index 1661d8c115c..d6f2e562b7a 100644
--- a/src/plots/cartesian/axes.js
+++ b/src/plots/cartesian/axes.js
@@ -1502,7 +1502,7 @@ function arrayTicks(ax, majorOnly) {
         for(var i = 0; i < vals.length; i++) {
             var vali = tickVal2l(vals[i]);
             if(vali > tickMin && vali < tickMax) {
-                var obj = axes.tickText(ax, vali, false, String(text[i]), {
+                const obj = axes.tickText(ax, vali, false, text[i] !== undefined, {
                     first: i === firstIdx,
                     last: i === lastIdx,
                 });
diff --git a/test/jasmine/tests/axes_test.js b/test/jasmine/tests/axes_test.js
index e964c3c33da..aff194fc690 100644
--- a/test/jasmine/tests/axes_test.js
+++ b/test/jasmine/tests/axes_test.js
@@ -3931,6 +3931,40 @@ describe('Test axes', function() {
             });
         });
 
+        it('applies prefixes and suffixes to array ticks without explicit text', () => {
+            ['linear', 'log', 'date', 'category'].forEach(axType => {
+                const vals = axType === 'date' ?
+                    ['2020-01-01', '2020-01-02', '2020-01-03'] :
+                    axType === 'category' ? ['a', 'b', 'c'] : [1, 2, 3];
+                const ax = {
+                    type: axType,
+                    tickmode: 'array',
+                    tickvals: vals,
+                    range: axType === 'log' ? [0, 1] :
+                        axType === 'category' ? [-0.5, 2.5] : [vals[0], vals[2]],
+                    tickprefix: '<',
+                    ticksuffix: '>',
+                    showtickprefix: 'all',
+                    showticksuffix: 'all',
+                    nticks: 10
+                };
+                if(axType === 'category') {
+                    ax._categories = vals;
+                    ax._categoriesMap = {a: 0, b: 1, c: 2};
+                }
+                const bare = mockCalc({...ax, tickprefix: '', ticksuffix: ''});
+                expect(mockCalc(ax)).toEqual(bare.map(text => `<${text}>`), axType);
+                ax.ticktext = ['custom'];
+                expect(mockCalc(ax)).toEqual(['custom', `<${bare[1]}>`, `<${bare[2]}>`], axType);
+                ax.showtickprefix = 'first';
+                ax.showticksuffix = 'last';
+                delete ax.ticktext;
+                expect(mockCalc(ax)).toEqual([`<${bare[0]}`, bare[1], `${bare[2]}>`], axType);
+                ax.showtickprefix = ax.showticksuffix = 'none';
+                expect(mockCalc(ax)).toEqual(bare, axType);
+            });
+        });
+
         it('should handle tickvals edge cases with category axes', function() {
             var ax = {
                 type: 'category',

From c8ecfd27a4e52229b17d598ad18243189a2f221e Mon Sep 17 00:00:00 2001
From: Davis Rens <166565828+davrens101@users.noreply.github.com>
Date: Sun, 1 Nov 2026 14:04:39 -0800
Subject: [PATCH 2/2] Link the tick prefix and suffix draftlog to PR 8160

---
 draftlogs/8160_fix.md    | 1 +
 draftlogs/pending_fix.md | 1 -
 2 files changed, 1 insertion(+), 1 deletion(-)
 create mode 100644 draftlogs/8160_fix.md
 delete mode 100644 draftlogs/pending_fix.md

diff --git a/draftlogs/8160_fix.md b/draftlogs/8160_fix.md
new file mode 100644
index 00000000000..dff6b4ee856
--- /dev/null
+++ b/draftlogs/8160_fix.md
@@ -0,0 +1 @@
+- Apply `tickprefix` and `ticksuffix` to `tickvals` without explicit `ticktext` [[#8160](https://github.com/plotly/plotly.js/pull/8160)]
diff --git a/draftlogs/pending_fix.md b/draftlogs/pending_fix.md
deleted file mode 100644
index 9a87408c969..00000000000
--- a/draftlogs/pending_fix.md
+++ /dev/null
@@ -1 +0,0 @@
-- Apply `tickprefix` and `ticksuffix` to `tickvals` without explicit `ticktext`