using ng-class or ng-style for displaying error messages when validating a text area content

I'm curious about the most effective "angular" method for changing the character count style for validation purposes. I have a text area with a 250-character limit. Instead of restricting users to exactly 250 characters, we want to allow them to exceed that limit and show a negative number in red font (similar to Twitter, etc.). What would be the optimal approach for this? Should I use ng-style or ng-class with a boolean evaluation to trigger the change?

<h6 class="subheader right" ng-class="{'alert':'(250 - formData.SubTitle.length) < 0'}">{{250 - formData.SubTitle.length}} /250</h6>

"alert" is the class name to switch to once the character count falls below 0.

UPDATE: In this scenario, what sets ng-class apart from ng-style (if anything)?

javascriptcssangularjs

Answer №1

When it comes to your specific needs, using ng-style may not be the most practical option. Especially if your application involves a large number of inputs. Utilizing one class for all inputs is more efficient and aligns with the principles of DNRY. Applying styles individually to each input can become quite laborious. This task becomes even more daunting when you need to update styles across multiple inputs (which will inevitably happen).

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