Conditionally change color of angularjs element? - css

Question

Im still pretty new to AngularJS. Im trying to change the color of the table element so that its yellow if the user voted on this choice.
<div ng-show="poll.userVoted">
<table class="result-table">
<tr ng-repeat="choice in poll.choices">
<td>{{choice.text}}</td>
<td>
<table ng-if="choice.text == poll.userChoice.text" style="background-color: yellow; width: {{choice.votes.length/poll.totalVotes*100}}%; text-align: right">
<tr>
<td>{{choice.votes.length}}</td>
</tr>
</table>
<table ng-if="choice.text != poll.userChoice.text" style="background-color: lightblue; width: {{choice.votes.length/poll.totalVotes*100}}%; text-align: right">
<tr>
<td>{{choice.votes.length}}</td>
</tr>
</table>
</td>
</tr>
</table>

Answer 1

This is done by using ng-class.
Use ng-class on your td like this:
<td ng-class="{yellowstyle: choice.text==poll.userChoice.text}">...</td>
that will put the css class yellowstyle on the item when your condition is true.
And in your example:
<table class="result-table">
<tr ng-repeat="choice in poll.choices">
<td>{{choice.text}}</td>
<td>
<table style="width: {{choice.votes.length/poll.totalVotes*100}}%; text-align: right">
<tr>
<td ng-class="{yellowstyle: choice.text==poll.userChoice.text, lightbluestyle: choice.text!=poll.userChoice.text}">{{choice.votes.length}}</td>
</tr>
</table>
</td>
</tr>
</table>
with a style.css file that has:
.yellowstyle {background-color: yellow;}
.lightbluestyle {background-color: lightblue;}