I have a search box and a search button. I need to disable button until user provides the search term, but the button gets disable always. I have following the code:
<input type='text' [(ngModel)]='listFilter' />
<button [disabled]="!listFilter" class="btn btn-primary"(click)='OnSearch(listFilter)'>
Search
</button>
What's wrong here? I'm using angular 4
You must use a template reference variable!
To do this, you can use either ref-prefix or #prefix. In your example, you will have to modify it like this:
<input ref-filter type='text' [(ngModel)]='listFilter' />
<button [disabled]="!filter.value" class="btn btn-primary" (click)='OnSearch(listFilter)'>
Search
</button>
A model reference variable (#varRef) is not the same as a model input variable (variable let), as you might see in a * ngFor. The scope of a reference variable is the entire model. Do not set the same variable name more than once in the same model. The execution value will be unpredictable.
<input ref-filter type='text' [(ngModel)]='listFilter' />
<button class="btn btn-primary" [disabled]="listFilter === ''"(click)="ClearText()">Reset User</button>
TS:
listFilter='';
ClearText(){
this.listFilter='';
}