Soldeplata Saketos Soldeplata Saketos - 1 year ago 49
AngularJS Question

How to update the number of columns in an angular table

I want to change the number of columns on modifying a boolean variable.
Check my example (in plnkr):



angular.module('ui.bootstrap.demo', ['ngAnimate', 'ngSanitize', 'ui.bootstrap']);
angular.module('ui.bootstrap.demo').controller('myCtrl', function($scope, $log) {
$scope.debug = {};
$scope.fields = [{
header: "first",
hideField: !$scope.debug.flag
},
{
header: "second"
},
{
header: "third"
},
{
header: "fourth"
},
];
$scope.entries = [{
first: "hello1",
second: "hello2",
third: "hello3",
fourth: "hello4"
}, ]
$scope.myBool = true;
});

<!doctype html>
<html ng-app="ui.bootstrap.demo">

<head>
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.6.1/angular.js"></script>
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.6.1/angular-animate.js"></script>
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.6.1/angular-sanitize.js"></script>
<script src="//angular-ui.github.io/bootstrap/ui-bootstrap-tpls-2.5.0.js"></script>
<link href="//netdna.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>

<body>

<div ng-controller="myCtrl">
<button id="testButton" class='btn btn-danger' ng-click='debug.flag = !debug.flag'><i class="glyphicon glyphicon-hand-right"></i> refreshFields! debug.flag = {{!!debug.flag}}</button>
<hr>
<h2 class="label label-info">table 1 with property.hideField = true</h2>
<table class="table table-hover">
<tr>
<!-- Headers of list-->
<th ng-repeat="property in fields" ng-if="!property.hideField">{{property.header}}
</th>
</tr>
<tbody>
<tr ng-repeat="entry in entries">
<td ng-repeat="property in fields" ng-if="!property.hideField">
{{entry[property.header]}} {{!!debug.flag}}
</td>
</tr>
</tbody>

</table>
<h4 class="label label-info">table 2 with ng-if => property.hideField = false</h4>
<table class="table table-hover">
<tr>
<!-- Headers of list-->
<th ng-repeat="property in fields" ng-if="property.hideField">{{property.header}}
</th>
</tr>
<tbody>
<tr ng-repeat="entry in entries">
<td ng-repeat="property in fields" ng-if="property.hideField">
{{entry[property.header]}} {{!!debug.flag}}
</td>
</tr>
</tbody>

</table>
<h2 class="label label-info">table 3 without ng-if</h2>
<table class="table table-hover">
<tr>
<!-- Headers of list-->
<th ng-repeat="property in fields">{{property.header}}
</th>
</tr>
<tbody>
<tr ng-repeat="entry in entries">
<td ng-repeat="property in fields">
{{entry[property.header]}} {{!!debug.flag}}
</td>
</tr>
</tbody>

</table>
</div>
</body>

</html>





How to reproduce it:



Click on the red button and the flag will toggle from false to true.

Expected behavior:




  • Table 1 starts with 3 columns. It should show four after clicking.

  • Table 2 starts with 1 column. It should show 0 columns after clicking.

  • Table 3 is just a control table with all the data.


Answer Source

Your heading would become visible if you modified the value of its hideField property. But you're not doing that. You're modifying the value of $scope.debug.flag.

The fact that hideField was initialized with the value of $scope.debug.flag won't magically change hideField every time you change $scope.debug.flag.

Just like if you do

var a = 1;
var b = a;
a = 42;

The value of b will still be 1. Not 42.

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