Dynamic Inline CSS using AngularJS

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">

  <a href="#">anchor</a>

  <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>