`the issue of $scope object not being passed correctly to ng-if and ng-class ternary conditions

 **app.js:**

     $scope.servers = [
            {name:'SQL Server', status:"up"},
            {name:'Web Server', status:"down"},
            {name:'Index Server', status:"down"}
        ];

**index.html:**
  <table>
    <tr>
      <td ng-repeat="server in servers">
        <div ng-if="{{server.name}}=='SQL Server'"> {{server.status}} </div>
      </td>
    </tr>
  </table>

    <table>
      <tr>
        <td ng-repeat="server in servers">
          <div ng-if="{{server.name}}=='SQL Server'" ng-class="{{server.status}}=='up'? 'squareGreen':'squareRed'"> {{server.name +" : "+server.status}} </div>
        </td>
      </tr>
    </table>

I am attempting to pass a list of server statuses to index.html and compare the 'name' to a specific string, then apply the CSS class squaregreen or red based on whether the 'status' is 'up' or 'down'. The objective is to match the server name and apply green when up and red when down. However, I'm facing two issues below: 1. there is a parse error in the syntax for ng-if 2. all servers are being marked as Squarered, even though the first server (SQL) has a status of 'up'.

Answer №1

Make sure to eliminate all the curly brackets from your ng-if and ng-class statements for it to function correctly. For example:

main.js:

 $scope.status = [
        {name:'SQL', stat:"up"},
        {name:'Web Server', stat:"down"},
        {name:'Index', stat:"down"}
    ];

**index.html:**
  <table>
    <tr>
      <td ng-repeat="x in status">
        <div ng-if="x.name=='SQL'"> {{x.stat}} </div>
      </td>
    </tr>
  </table>

    <table>
      <tr>
        <td ng-repeat="x in status">
          <div ng-if="x.name=='SQL'" ng-class="x.stat=='up'? 'squareGreen':'squareRed'"> {{x.name +" : "+x.stat}} </div>
        </td>
      </tr>
    </table>

It is important to note that curly braces are not needed here since ng-if and ng-class bindings are automatically evaluated as scope expressions. Curly braces should only be used when a directive requires them explicitly (e.g. with '@' bindings). Check AngularJS documentation on scope binding

Answer №2

Remove the curly brackets from your code snippet: ng-if="x.name === 'SQL'"

Answer №3

Avoid using the extrapolation {{}} operator with ng-if, and make sure to utilize {} within your ng-class

<div ng-if="x.type == 'DB'" ng-class="{x.status=='active'? 'greenBox':'redBox'}"> {{x.type +" : "+x.status}} </div>

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