# \[Guide\] Require empty check?
**URL:** https://discuss.emberjs.com/t/guide-require-empty-check/9726
**Category:** Uncategorized
**Created:** [February 9, 2016, 7:54pm UTC](https://discuss.emberjs.com/t/guide-require-empty-check/9726 "2016-02-09T19:54:01Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@pcjpcj2](https://discuss.emberjs.com/u/pcjpcj2)
#### Post date: [February 9, 2016, 7:54pm UTC](https://discuss.emberjs.com/t/guide-require-empty-check/9726/1 "2016-02-09T19:54:01Z")
I am following ember.js 2.3.0 guide.
now I read and code autocomplete method.
> **[Building a Complex Component - Tutorial - Ember Guides](https://guides.emberjs.com/v2.3.0/tutorial/autocomplete-component/)**
>
> As they search for a rental, users might also want to narrow their search to a specific city. Let's build a component that will let them filter rentals by city.
>
> To begin, let's generate our new component. We'll call this component list-filter,...
In this page, **app/controller/index.js** make undefined error when empty input string.
I don’t want to leave it.
So.
is it right code to solve? I find Ember.isEmpty().
```javascript
export default Ember.Controller.extend({
filteredList: null,
actions: {
autoComplete(param) {
if(param !== "") {
this.store.query('rental', {city: param}).then((result) => {
this.set('filteredList',result);
});
}
else {
let filteredList = this.get('filteredList');
if(Ember.isEmpty(filteredList)) {
return;
}
console.log();
this.set('filteredList').clear();
}
},
search(param) {
if(param !== "") {
this.store.query('rental', {city: param}).then((result) => {
this.set('model',result);
});
}
else {
let model = this.get('model');
if(Ember.isEmpty(model)){
return;
}
this.set('model').clear();
}
}
}
});
```
I want to know someone who have elegant solution.
---
### Author:  [@Sarath](https://discuss.emberjs.com/u/Sarath)
#### Post date: [February 13, 2016, 10:00am UTC](https://discuss.emberjs.com/t/guide-require-empty-check/9726/2 "2016-02-13T10:00:03Z")
Empty checks can be done with Ember.isEmpty() or Ember.isBlank()
Where Ember.isEmpty returns false for ({}) and isBlank will return true. So while handling objects try to use isBlank method
---
### Author:  [@pcjpcj2](https://discuss.emberjs.com/u/pcjpcj2)
#### Post date: [February 13, 2016, 1:16pm UTC](https://discuss.emberjs.com/t/guide-require-empty-check/9726/3 "2016-02-13T13:16:50Z")
Thanks @Sarath 🙂
I’ll try `Ember.isBlank()`