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I need to display dynamic color for a div based on some condition. I am getting console error.

I have tried

<div [ngClass]="{'clr-{{students.rollNo+1}}': students.active}"></div>

students is my array, i have a class called .clr-5, clr-6 etc... in css

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2 Answers 2

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try this:

<div [ngClass]="[ students.active ? 'clr-'+students.rollNo+1 : '']"></div>

class bindings are updated in Angular 9. Read more about it here

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calculation not working clr-'+students.rollNo+1 need to add 1 with rollno
It will get concatenated with your dynamic value of roll number, here is an example: codesandbox.io/s/small-feather-0vk1z?file=/src/app/…
sorry cannot view this, white screen i can see!
if 25 is roll no then I need to add 25+1=26 should be the value not concatenation (251) Thanks!
you can try with creating a method that returns your calculated value and then concatenate with class like this: 'clr-'+ addRollNumber(rollNo) the method definition: addRollNumber(rollNo) { return rollNo + 1; }
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string interpolation not work inside property binding. you should deal with that like:

<div [ngClass]="{`clr-${students.rollNo+1}`: students.active}"></div>
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calculation not working clr-'+students.rollNo+1 need to add 1 with rollno

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