组件测试中的角度单击选择选项 [英] Angular click select option in component test
问题描述
我尝试以下尝试在选择下拉列表中单击一个选项,但这些选项均无效.
I have tried the following to try to click an option in a select dropdown none of which work.
selectEl = fixture.debugElement.query(By.css('#dropdown'));
selectEl.nativeElement.options[3].nativeElement.dispatchEvent(new Event('click'));
selectEl.queryAll(By.css('option'))[3].nativeElement.click();
selectEl.nativeElement.options[3].nativeElement.click();
我每次运行fixture.detectChanges();
来运行变化检测,但是当我去检查元素值时它并没有变化. expect(selectEl.nativeElement.options[selectEl.nativeElement.selectedIndex].textContent).toBe('name2');
After each i run fixture.detectChanges();
to run the change detection but when I go to check the elements value it hasn't changed. expect(selectEl.nativeElement.options[selectEl.nativeElement.selectedIndex].textContent).toBe('name2');
我错过了一些简单的方法来使它正常工作吗?
Am I missing something simple to get this to work?
推荐答案
更改下拉列表的所选选项的方法是设置下拉列表的值,然后调度change
事件.
The way to change the selected option of a dropdown is to set the dropdown value and then dispatch a change
event.
您可以使用以下答案作为参考: 角度单元测试选择onChange间谍对空值
You can use this answer as reference: Angular unit test select onChange spy on empty value
在您的情况下,您应该执行以下操作:
In your case, you should do something like this:
const select: HTMLSelectElement = fixture.debugElement.query(By.css('#dropdown')).nativeElement;
select.value = select.options[3].value; // <-- select a new value
select.dispatchEvent(new Event('change'));
fixture.detectChanges();
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