How to apply multiple styles based on multiple conditions in ng-style directive?

问题

In angular, I need to apply different style attributes based on different conditions but its not working this way and I only can apply 2 conditions with conditional expression.

<div ng-style="
    (status=="up")  ?{'background-color':'green' ,'color':'green'}
    (status=="down")?{'background-color':'red'   ,'color':'red'}
    (status=="idle")?{'background-color':'yellow','color':'yellow'}
    (status=="")    ?{'background-color':'grey'  ,'color':'grey'}
">

It would be better if you know any way to pass attribute to a function that returns style obj for ng-style like bellow which is weirdly not working!

$scope.styleFn(status,attr) {
        (status=="up")  ?{attr:'green'}
        (status=="down")?{attr:'red'}
        (status=="idle")?{attr:'yellow'}
        (status=="")    ?{attr:'grey'}
}

<div ng-style="styleFn('up','background-color')">

回答1:

yes you can use a function to specify a more complex condition.

var style = {
  'up': {'background-color':'green' ,'color':'green'},
  'down': {'background-color':'red' ,'color':'red'},
  'idle': {'background-color':'yellow' ,'color':'yellow'},
  'default': {'background-color':'grey'  ,'color':'grey'}
}

$scope.applyStyle = function(status) {
    //the status is the key to get the target style
    return status ? style[status] : style['default']; 
)};

then the template

<div ng-style="applyStyle(status)"></div>

回答2:

You can use ng-class as well.

function DemoCtrl($scope) {
    $scope.status = 'up'
}

.green {
    color: green;
    background-color:green;
}
.red {
    color: red;
    background-color:red
}
.yellow {
    color: yellow;
    background-color:yellow;
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<div ng-app>
    
    <table ng-controller="DemoCtrl">
        <tr ng-class="{'green': status == 'up','red':status== 'down' ,'yellow': status== 'idle' } ">
            <td style="color:white;">Your status is {{status}}</td>
        </tr>
    </table>
</div>

来源：https://stackoverflow.com/questions/44210899/how-to-apply-multiple-styles-based-on-multiple-conditions-in-ng-style-directive

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javascript

css

angularjs

ng-style