Docs: Improve the solution for boolean-attributes
#588
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Because jQuery 4.0.0 will not transform attribute values in the getter, the following code changes between jQuery 3.x & 4.x: ```js $( elem ).prop( "disabled", true ); $( elem ).attr( "disabled" ); ``` In jQuery 3.x, the reported attribute value is `"disabled"`, in jQuery 4.x it will be an empty string. This may create issues when migrating so Migrate patches and warns against it. Add a recommendation to avoid using the `.attr()` getter on boolean attrs.
timmywil
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Aug 12, 2025
mgol
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Aug 12, 2025
Because jQuery 4.0.0 will not transform attribute values in the getter, the following code changes between jQuery 3.x & 4.x: ```js $( elem ).prop( "disabled", true ); $( elem ).attr( "disabled" ); ``` In jQuery 3.x, the reported attribute value is `"disabled"`, in jQuery 4.x it will be an empty string. This may create issues when migrating so Migrate patches and warns against it. Add a recommendation to avoid using the `.attr()` getter on boolean attrs. Closes gh-588 (cherry picked from commit e61af3f)
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Because jQuery 4.0.0 will not transform attribute values in the getter, the following code changes between jQuery 3.x & 4.x:
In jQuery 3.x, the reported attribute value is
"disabled", in jQuery 4.x it will be an empty string. This may create issues when migrating so Migrate patches and warns against it.Add a recommendation to avoid using the
.attr()getter on boolean attrs.