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fix(ivy): error when encountering an empty class attribute (#28321) 

Fixes Ivy throwing an error if it encounters an empty class attribute in a template (`class=""`).

This PR resolves FW-972.

PR Close #28321
This commit is contained in:
Kristiyan Kostadinov 2019-01-23 18:41:20 +01:00 committed by Jason Aden
parent 9098225ff0
commit 22a43cff4d
2 changed files with 18 additions and 8 deletions
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19
packages/core/src/render3/styling/class_and_style_bindings.ts
View File

@ -982,14 +982,17 @@ function setClass(
if (playerBuilder) {
playerBuilder.setValue(className, add);
}
} else if (add) {
ngDevMode && ngDevMode.rendererAddClass++;
isProceduralRenderer(renderer) ? renderer.addClass(native, className) :
native['classList'].add(className);
} else {
ngDevMode && ngDevMode.rendererRemoveClass++;
isProceduralRenderer(renderer) ? renderer.removeClass(native, className) :
native['classList'].remove(className);
// DOMTokenList will throw if we try to add or remove an empty string.
} else if (className !== '') {
if (add) {
ngDevMode && ngDevMode.rendererAddClass++;
isProceduralRenderer(renderer) ? renderer.addClass(native, className) :
native['classList'].add(className);
} else {
ngDevMode && ngDevMode.rendererRemoveClass++;
isProceduralRenderer(renderer) ? renderer.removeClass(native, className) :
native['classList'].remove(className);
}
}
}

7
packages/core/test/linker/regression_integration_spec.ts
View File

@ -317,6 +317,13 @@ function declareTests(config?: {useJit: boolean}) {
expect(ctx.componentInstance.viewContainers.first).toBe(vc);
});
it('should not throw when encountering an empty class attribute', () => {
const template = '<div class=""></div>';
TestBed.overrideComponent(MyComp1, {set: {template}});
expect(() => TestBed.createComponent(MyComp1)).not.toThrow();
});
describe('empty templates - #15143', () => {
it('should allow empty components', () => {
@Component({template: ''})