带条件的角度属性绑定

Question

How can I add a + 1 to my condition with [class.active] binding? It isn't working in this way...

[class.active]="userProfile.id === (userProfile.lastId + 1)"

Answer 1

Use userProfile['lastId'] + 1

Try:

[class.active]="userProfile.id === userProfile['lastId']  + 1)"

Answer 2

Your code is working fine check stackblitz example below or you can use ngClass

[ngClass]="{'active': userProfile.id == (userProfile.lastId + 1)}"

Check if peroperties that you'r using are of number typo may be they are evaluating to string like id:'1'

Stackblitz

Answer 3

尝试这个

[ngClass]="{'active': userProfile.id === userProfile.lastId + 1}"

Answer 4

you can uns == if any of the proprty are not number (string value) , drop the type checking

<p [class.active]="+userProfile.id == (+userProfile.lastId + 1)" >...</p>

the + infornt of userProfile.lastId,userProfile.id will convert the value to number