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I am learning Angular 2. I am trying to implement autosave functionality using (change) event. Like this

<div>
    <md-input class="ctrl" [(ngModel)]="first" (blur)="saveItemInfo()"></md-input>
</div>
<div>
    <md2-autocomplete [items]="items" item-text="name" item-value="value" [(ngModel)]="second" [disabled]="disabled"
        (change)="saveItemInfo()">
    </md2-autocomplete>
</div>
<div>
    <md-slide-toggle [(ngModel)]="third" color="primary" (change)="saveItemInfo()"></md-slide-toggle>
</div>

Here the problem is, change event is firing even when page loads. So that it is making so many api calls. Any other way to do this?

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3
  • Do a check in saveItemInfo to see if anything actually changed. Commented Oct 17, 2016 at 6:04
  • Try to change (change) to (keyup) and check if it works for you. Commented Oct 17, 2016 at 6:08
  • @micronyks, (keyup) not working for md2-autocomplete. It is not firing event when change occurs. Commented Oct 17, 2016 at 6:14

1 Answer 1

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You can keep a private variable like _second and on every (change) event check if anything changed:

  • If yes, set the private variable to the new value and call your API methods.
  • If not, do nothing
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