Merge pull request #18557 from craftcms/bugfix/18552-slidepicker-and-non-standard-values

ensure SlidePicker value is allowed by min/max/step config

Author: brandonkelly

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
 - Fixed an error that could occur after running the `utils/fix-field-layout-uids` command. ([#18516](https://github.com/craftcms/cms/issues/18516))
+- Fixed a JavaScript error that could occur if any field layout elements were configured with unsupported widths. ([#18552](https://github.com/craftcms/cms/issues/18552))
 
 ## 4.17.10 - 2026-03-11
 

src/web/assets/cp/dist/cp.js

@@ -141,6 +141,10 @@
       setValue: function (value, triggerEvent) {
         value = Math.max(Math.min(value, this.max), this.min);
 
+        // ensure that the value is valid - matches min, max or any of the steps in between
+        // if it doesn't match it already, choose the step value that's closest to it
+        value = Math.round(value / this.settings.step) * this.settings.step;
+
         if (this.value === (this.value = value)) {
           return;
         }