Dynamic Inline CSS using AngularJS - html

Question

I have an angular app and need to apply some CSS styles on a page, at runtime.
Solution using ng-style is not scalable:
I am aware that for specific (known) items, this can easily be done using the ng-style directive e.g.:
<div id="mydiv" ng-style="{color: bgColor}">ABCD</div>
However, this technique cannot be applied to all the <a> or <p> tags on the page. How does one apply a dynamic style based on an angular scope variable to ALL instances of a tag on the page?
Something like the following would be ideal:
<style>
.in3_counter {color: {{settings.in3Color}};}
.in4_counter {color: {{settings.in4Color}};}
</style>
Update: The value of the css scope variables isn't predetermined, so I we don't know what colors would be applied to the elements as the variables are set at runtime (e.g. with color picker).
Any suggestions?

Answer 1

Check the following example:
var COLOR_CTRL = function($scope, $sce) {
$scope.changeColor = function(color) {
$scope.style = $sce.trustAsHtml('a, p {color: ' + color + '}');
};
$scope.changeColor('#000');
};
var app = angular.module('app', []);
app.controller('ColorCtrl', ['$scope', '$sce', COLOR_CTRL]);
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.7/angular.min.js"></script>
<div ng-controller="ColorCtrl" ng-app="app">
anchor
<p>paragraph</p>
<div>
<button ng-click="changeColor('#f00')">red</button>
<button ng-click="changeColor('#0f0')">green</button>
<button ng-click="changeColor('#00f')">blue</button>
</div>
<style data-ng-bind-html="style"></style>
</div>