Can you explain the distinctions when it comes to sending constants as Props in Angular?

During my experience with the dx-calendar component from DevExtreme, I encountered an issue. I was attempting to set Monday as the first day of the week by passing 1 to the firstDayOfWeek property. Initially, I tried:

<dx-calendar firstDayOfWeek="1" />

However, this approach did not work. The correct solution turned out to be:

<dx-calendar [firstDayOfWeek]="1" />

Surprisingly, even though both methods seemed to pass 1 to the component, they resulted in different behaviors.

For a related question, check out this link.

angulartypescriptinputcomponents

Answer №1

After careful examination, I have identified the distinctions between the two options. The initial choice involves passing a string "1" to the component, whereas the second option involves passing the actual number 1.

Utilizing [] for attributes in Angular signifies that the value is considered an expression, meaning that what is ultimately passed to the component is eval("1"), resulting in 1.

Answer №2

In this scenario, you are setting the firstDayOfWeek property to a string value of "1".

<dx-calendar firstDayOfWeek="1" />

Alternatively, you can assign an integer value of 1 to the firstDayOfWeek property. (Using square brackets indicates assigning a JavaScript value to firstDayOfWeek, so 1 is assigned as an integer value.)

<dx-calendar [firstDayOfWeek]="1" />

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