Improve page performance by reducing number of binding with AngularJS? - performance

Question

Context
I'm building a list a results where each result can be edited by users.
Approach
Currently I'm repeating the visible <span> tag that displays a result as well as the hidden <input> tag used to edit this same result. See the last <td> :
<tr ng-repeat="entry in paginateDict | orderBy:predicate:reverse" class="form-inline" role="form">
<!-- Edit buttons -->
<td>
<div class="radio">
<label ng-hide="editMode" title="edit">
<input class="sr-only" type="radio" name="edit"
data-ng-click="editMode=true">
<span tooltip="edit" class="fa fa-pencil fa-lg"></span>
</label>
<label ng-show="editMode" title="save">
<input class="sr-only" type="radio" name="edit"
ng-model="editMode" ng-click="submitEntry(true)">
<span tooltip="save" class="fa fa-save fa-lg text-primary"></span>
</label>
<label ng-show="editMode" title="cancel">
<input class="sr-only" type="radio" name="edit"
ng-model="editMode" ng-click="submitEntry(false)">
<span tooltip="undo" class="fa fa-times fa-lg text-danger"></span>
</label>
</div>
</td>
<!-- Content -->
<td ng-show="pyn" lang="cmn-py" data-id="{{entry.cid}}">
<span ng-hide="editMode">{{entry.pyn | pinyin }}</span>
<input type="text" placeholder="{{entry.pyn}}" ng-model="entry.pyn" ng-show="editMode" class="form-control">
</td>
</tr>
Each line as 5 editable columns and each column as two binding (on <span> and <input>).
Question
In order to improve page performance, by reducing the number of binding, is there an Angular way to dynamically create and attach the <input> to a row when the edit radio button is click ?

Answer 1

You can do that using ngIf directive instead of ng-show
The ngIf directive removes or recreates a portion of the DOM tree based on an {expression}.
<td ng-show="pyn" lang="cmn-py" data-id="{{entry.cid}}">
<span ng-hide="editMode">{{entry.pyn | pinyin }}</span>
<input type="text" placeholder="{{entry.pyn}}" ng-model="entry.pyn" ng-if="editMode" class="form-control">
</td>