I am attempting to prevent a button from being clickable if an array is empty, but I am encountering difficulties.
<button [disabled]="(users.length ==0 )?true:false">Send mass emails</button>
Within the TypeScript file:
users: UsersModel[];
The code above is resulting in an error message:
Bindings cannot contain assignments at column
What is the correct method for disabling the button when the array is empty?
It appears that the users: UsersModel[] array in your component has not been initialized, resulting in it being undefined. As a result, you are attempting to access the length property of an undefined object/array. To address this issue, consider disabling the button if the users array has not been initialized or if its length is 0:
<button type="button" [disabled]="!users || users.length === 0">Send Mass Emails</button>
You can see a demonstration of this behavior in action on this plunkr link.
An alternative solution would be to initialize the user array as an empty array in your component:
users: UsersModel[] = [];
This way, you can easily disable or enable the button based on whether the user array's length is zero/false:
<button type="button" [disabled]="!user.length">Send mass emails</button>
You can see how initializing the users array to an empty array and checking its length can help in enabling/disabling the button in this plunkr example.
I hope this information proves helpful!
<button [disabled]="users.length > 0 ? false : true">Initiate group emails</button>
To customize the condition for the disabled attribute, you can modify it as shown below. You have the flexibility to first check if the user exists and then verify the length of the users array.
<button [disabled]="!user || users.length > 0 ? false : true">Initiate group emails</button>
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