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How would I conditionally apply CSS styles in AngularJS?

Suppose I want to alter the look of each "item" that a user marks for deletion before the main "delete" button is pressed. (This immediate visual feedback should eliminate the need for the proverbial "are you sure?" dialog box.) The user will check checkboxes to indicate which items should be deleted. If a checkbox is unchecked, that item should revert back to its normal look.

What's the best way to apply or remove the CSS styling?

Q2. Suppose I want to allow each user to personalize how my site is presented. E.g., select from a fixed set of font sizes, allow user-definable foreground and background colors, etc.

What's the best way to apply the CSS styling the user selects/inputs?

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This solution did the trick for me

<a ng-style="{true: {paddingLeft: '25px'}, false: {}}[deleteTriggered]">...</a>
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This works well when ng-class can't be used (for example when styling SVG):

ng-attr-class="{{someBoolean && 'class-when-true' || 'class-when-false' }}"

(I think you need to be on latest unstable Angular to use ng-attr-, I'm currently on 1.1.4)

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I have found problems when applying classes inside table elements when I had one class already applied to the whole table (for example, a color applied to the odd rows <myClass tbody tr:nth-child(even) td>). It seems that when you inspect the element with Developer Tools, the has no style assigned. So instead of using ng-class, I have tried using ng-style, and in this case, the new CSS attribute does appear inside This code works great for me:

<tr ng-repeat="element in collection">

    [...amazing code...]

    <td ng-style="myvar === 0 && {'background-color': 'red'} ||
                  myvar === 1 && {'background-color': 'green'} ||
                  myvar === 2 && {'background-color': 'yellow'}">{{ myvar }}</td>

    [...more amazing code...]


Myvar is what I am evaluating, and in each case I apply a style to each <td> depending on myvarvalue, that overwrites the current style applied by the CSS class for the whole table.


If you want to apply a class to the table for example, when visiting a page or in other cases, you can use this structure:

<li ng-class="{ active: isActive('/route_a') || isActive('/route_b')}">

Basically, what we need to activate a ng-class is the class to apply and a true or false statement. True applies the class and false doesn't. So here we have two checks of the route of the page and an OR between them, so if we are in /route_a OR we are in route_b, the active class will be applied.

This works just having a logic function on the right that returns true or false.

So in the first example, ng-style is conditioned by three statements. If all of them are false, no style is applied, but following our logic, at least one is going to be applied, so, the logic expression will check which variable comparison is true and because a non empty array is always true, that will left an array as return and with only one true, considering we are using OR for the whole response, the style remaining will be applied.

By the way, I forgot to give you the function isActive():

$rootScope.isActive = function(viewLocation) {
    return viewLocation === $location.path();


Here you have something I find really useful. When you need to apply a class depending on the value of a variable, for example, an icon depending on the contents of the div, you can use the following code (very useful in ng-repeat):

<i class="fa" ng-class="{ 'fa-github'   : type === 0,
                          'fa-linkedin' : type === 1,
                          'fa-skype'    : type === 2,
                          'fa-google'   : type === 3 }"></i>
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