Is here an AngularJS equivalent for Angular ng-container?
Or should I create something myself with a transclude directive?
Example use cases:
Tables with interlaced pairs, triples etc. of cells:
<table><tr>
<ng-container ng-repeat="item in items">
<td>{{ item.a }}</td>
<td>{{ item.b }}</td>
</ng-container>
</tr></table>
There should not be additional level in the DOM tree, and instead <td>
s should be direct children of <tr>
element.
There is similar problem with HTML lists, especially the definiton list where <dt>
/ <dd>
elements should be direct children of <dl>
while they usually exist in pairs.
Table-like arrangement of data with display:grid
:
<div style="display: grid; grid-template-columns: auto auto">
<ng-container ng-repeat="item in items">
<div>{{ item.a }}</div>
<div>{{ item.b }}</div>
</ng-container>
</div>
This case is even more problematic as the container element existing in DOM tree causes the whole layout to break, as it is rendered as the cell instead of its children.
AngularJS ng-include Directive The ng-include directive includes HTML from an external file. The included content will be included as childnodes of the specified element. The value of the ng-include attribute can also be an expression, returning a filename.
The panel directive is an example of a container. Panel takes a title attribute from the view, uses @ in the isolate scope to insert it into the template, and uses transclusion to append a clock component from the view into the template after the alert-box title.
You can consider using transclusion inside a custom directive, to achieve the behavior you are looking for without using ng-repeat.
ng-container serves as a container for elements which can also accept structural directives but is not rendered to the DOM, while ng-template allows you to create template content that is not rendered until you specifically (conditionally or directly) add it to the DOM.
In cases you have mentioned, you can use ng-repeat-start
and ng-repeat-end
pair, respectively:
Tables with interlaced pairs, triples etc. of cells:
<table><tr>
<td ng-repeat-start="item in items">{{ item.a }}</td>
<td ng-repeat-end>{{ item.b }}</td>
</tr></table>
HTML lists:
<dl>
<dt ng-repeat-start="item in items">{{ item.term }}</dt>
<dd ng-repeat-end>{{ item.definition }}</dd>
</dl>
Table-like arrangement of data with display:grid:
<div style="display: grid; grid-template-columns: auto auto">
<div ng-repeat-start="item in items">{{ item.a }}</div>
<div>{{ item.b }}</div>
<div ng-repeat-end>{{ item.c }}</div>
</div>
You can read about this in API reference: https://docs.angularjs.org/api/ng/directive/ngRepeat#special-repeat-start-and-end-points
Unfortunately in AngularJS ng-repeat
, ng-if
, etc must be used on an HTML element that will be present in the markup. Depending on the exact use-case you could try using an element directive with replace: true
.
You can use the same ng-container
in both Angularjs
and Angular-2
as well. But in angular-2
have an additional option is ng-template
which is act as ng-container
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