AngularJS: ng-show / ng-hide not working with `{{

2019-01-01 12:43发布

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问题:

I am trying to show / hide some HTML using the ng-show and ng-hide functions provided by AngularJS.

According to the documentation, the respective usage for these functions are as follows:

ngHide – {expression} - If the expression truthy then the element is shown or hidden respectively. ngShow – {expression} - If the expression is truthy then the element is shown or hidden respectively.

This works for the following usecase:

<p ng-hide=\"true\">I\'m hidden</p>
<p ng-show=\"true\">I\'m shown</p>

However, should we use a parameter from an object as the expression then the ng-hide and ng-show are given the correct true/false value but the values are not treated as a boolean so always return false:

Source

<p ng-hide=\"{{foo.bar}}\">I could be shown, or I could be hidden</p>
<p ng-show=\"{{foo.bar}}\">I could be shown, or I could be hidden</p>

Result

<p ng-hide=\"true\">I should be hidden but I\'m actually shown</p>
<p ng-show=\"true\">I should be shown but I\'m actually hidden</p>

This is either a bug or I am not doing this correctly.

I cannot find any relative information on referencing object parameters as expressions so I was hoping anyone with a better understanding of AngularJS might be able to help me out?

回答1:

The foo.bar reference should not contain the braces:

<p ng-hide=\"foo.bar\">I could be shown, or I could be hidden</p>
<p ng-show=\"foo.bar\">I could be shown, or I could be hidden</p>

Angular expressions need to be within the curly-brace bindings, where as Angular directives do not.

See also Understanding Angular Templates.



回答2:

You can\'t use {{}} when using angular directives for binding with ng-model but for binding non-angular attributes you would have to use {{}}..

Eg: 

ng-show=\"my-model\"
title = \"{{my-model}}\"


回答3:

Try wrapping expression with: 

$scope.$apply(function() {
   $scope.foo.bar=true;
})


回答4:

Since ng-show is an angular attribute i think, we don\'t need to put the evaluation flower brackets ({{}})..

For attributes like class we need to encapsulate the variables with evaluation flower brackets ({{}}).



回答5:

<script src=\"http://code.angularjs.org/1.2.0-rc.2/angular.js\"></script>
<script type=\"text/javascript\">
    function controller($scope) {
        $scope.data = {
            show: true,
            hide: false
        };
    }
</script>

<div ng-controller=\"controller\">
    <div ng-show=\"data.show\"> If true the show otherwise hide. </div>
    <div ng-hide=\"!(data.hide)\"> If true the show otherwise hide.</div>
</div>


回答6:

remove {{}} braces around foo.bar because angular expressions cannot be used in angular directives.

For More: https://docs.angularjs.org/api/ng/directive/ngShow

example

  <body ng-app=\"changeExample\">
    <div ng-controller=\"ExampleController\">
    <p ng-show=\"foo.bar\">I could be shown, or I could be hidden</p>
    <p ng-hide=\"foo.bar\">I could be shown, or I could be hidden</p>
    </div>
    </body>

<script>
     angular.module(\'changeExample\', [])
        .controller(\'ExampleController\', [\'$scope\', function($scope) {
          $scope.foo ={};
          $scope.foo.bar = true;
        }]);
</script>


回答7:

If you want to show/hide an element based on the status of one {{expression}} you can use ng-switch:

<p ng-switch=\"foo.bar\">I could be shown, or I could be hidden</p>

The paragraph will be displayed when foo.bar is true, hidden when false.



标签： angularjs ng-show ng-hide
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