Angular 2 select option (dropdown) - how to get the value on change so it can be used in a function?

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I am trying to build a drop down with a few values.

However, on selecting a value, I want to make an API call that takes an id.

In my component.ts, I have an array of values:

values = [
  { id: 3432, name: "Recent" },
  { id: 3442, name: "Most Popular" },
  { id: 3352, name: "Rating" }
];

In my template, I am using that array as follows:

<select>
  <option *ngFor="let v of values" [value]="v">  
    {{v.name}}
  </option>
</select>

However, on picking a value from the drop down, how can I access the id property? I want to use that in my function getPhotosByType(id).

Thanks

My answer is little late but simple; but may help someone in future; I did experiment with angular versions such as 4.4.3, 5.1+, 6.x, 7.x and 8.x using $event (latest at the moment)

Template:

<select (change)="onChange($event)">
    <option *ngFor="let v of values" [value]="v.id">{{v.name}}</option>
</select>

TS

export class MyComponent {
  public onChange(event): void {  // event will give you full breif of action
    const newVal = event.target.value;
    console.log(newVal);
  }
}

How do I get the value of the selected dropdown menu item with , Technically, a dropdown element is actually a select element and each menu item in the But with Angular, you need to do a little bit of the work. was a change; we want to know which one of the option elements was selected. There is a selectedDay property, which will be used to display the value of the Example # 2  I'm developing an Angular 2 application with ASP.NET Core 2.0 and the Visual Studio 2017 Angular's Web application template. I don't know how to get the selected value from a select when the user

You need to use an Angular form directive on the select. You can do that with ngModel. For example

@Component({
  selector: 'my-app',
  template: `
    <h2>Select demo</h2>
    <select [(ngModel)]="selectedCity" (ngModelChange)="onChange($event)" >
      <option *ngFor="let c of cities" [ngValue]="c"> {{c.name}} </option>
    </select>
  `
})
class App {
  cities = [{'name': 'SF'}, {'name': 'NYC'}, {'name': 'Buffalo'}];
  selectedCity = this.cities[1];

  onChange(city) {
    alert(city.name);
  }
}

The (ngModelChange) event listener emits events when the selected value changes. This is where you can hookup your callback.

Note you will need to make sure you have imported the FormsModule into the application.

Here is a Plunker

How to pass the drop down option value to component using data list?, But on select I should pass the selected value (object means I should pass name select of particular app it should pass the details of app to the function. Declare myapp variable in typescript and on change you can get But the issue is I want the drop down with search bar so I have used the <datalist>. Angular 2 - Setting selected value on dropdown list Binding select element to object in Angular 2. How to use select/option/NgFor on an array of objects in

values_of_objArray = [
  { id: 3432, name: "Recent" },
  { id: 3442, name: "Most Popular" },
  { id: 3352, name: "Rating" }
];

private ValueId : number = 0 // this will be used for multi access like 
                             // update, deleting the obj with id.
private selectedObj : any;

private selectedValueObj(id: any) {
  this.ValueId = (id.srcElement || id.target).value;
  for (let i = 0; i < this.values_of_objArray.length; i++) {
    if (this.values_of_objArray[i].id == this.ValueId) {
      this.selectedObj = this.values_of_objArray[i];
    }
  }
}

Now play with this.selectedObj which has the selected obj from the view.

HTML:

<select name="values_of_obj" class="form-control" [(ngModel)]="ValueId"  
        (change)="selectedValueObj($event)" required>

  <option *ngFor="let Value of values_of_objArray"
          [value]="Value.id">{{Value.name}}</option>    
</select>

Angular Select Option Set Selected Dynamically, Here's an example in Angular 2 … We use a property binding to bind the drop down option value to the product id. setting the selected product when the drop down selection changes; On line 7, we use On line 8, we have an onSelect method which handles when a drop down option is selected which  So now we have the full picture: getting the value of the selected dropdown menu item with Angular requires that an event handler be set for the (change) attribute of a select element. But because select elements have one or more children (i.e. the option elements), we need to inspect the event object that is passed to the change event handler.

Another solution would be,you can get the object itself as value if you are not mentioning it's id as value: Note: [value] and [ngValue] both works here.

<select (change)="your_method(values[$event.target.selectedIndex])">
  <option *ngFor="let v of values" [value]="v" >  
    {{v.name}}
  </option>
</select>

In ts:

your_method(v:any){
  //access values here as needed. 
  // v.id or v.name
}

Note: If you are using reactive form and you want to catch selected value on form Submit, you should use [ngValue] directive instead of [value] in above scanerio

Example:

  <select (change)="your_method(values[$event.target.selectedIndex])" formControlName="form_control_name">
      <option *ngFor="let v of values" [ngValue]="v" >  
        {{v.name}}
      </option>
    </select>

In ts:

form_submit_method(){
        let v : any = this.form_group_name.value.form_control_name;  
    }

Angular Drop Down Binding, I'm trying to get the updated select box value, which in this case is an object, I'm trying to use the [ngValue]="object" syntax added in #7842 like so. the new value from the $event obj passed into the change function. pkozlowski-​opensource closed this on Jun 2, 2016 @angular-automatic-lock-bot  In Angular select element, the value attribute of <option> element can bind an object using property binding and one field of the object can be used to display items. For validation of select element, we need to use validation attribute such as required. We can get validation state like valid and invalid using local template variable.

Template/HTML File (component.ts)

<select>
 <option *ngFor="let v of values" [value]="v" (ngModelChange)="onChange($event)">  
    {{v.name}}
  </option>
</select>

Typescript File (component.ts)

values = [
  { id: 3432, name: "Recent" },
  { id: 3442, name: "Most Popular" },
  { id: 3352, name: "Rating" }
];

onChange(cityEvent){
    console.log(cityEvent); // It will display the select city data
}

(ngModelChange) is the @Output of the ngModel directive. It fires when the model changes. You cannot use this event without the ngModel directive

Select change event occurs before ngModel updates · Issue #7971 , 4 and 5. The post also shows new HTTPClient changes in Angular 5. Although angular 5 is the recent version, but Angular 4 is still used in many projects. So in this post, we'll find out how to bind select dropdown list in Angular 4 and 5. <option *ngFor="let summary of summaries" value={{summary}}>. Bind Select DropDown List in Angular 2 April 12, 2016 December 22, 2018 Talking Dotnet Angular , Angular 2 Earlier I posted about the differences between AngularJS 1.x and Angular 2 in which I tried to explain how things changed with respect to Angular 2 .In this post, we’ll find out how to bind select dropdown list in Angular 2.

Bind Select DropDown List in Angular 4 and 5, In Angular as a OPTION value we can use not only string literals, but also objects. So now we have the same SELECT but now as a value we get not the name of we also use patchValue method to change the default value of our SELECT. compareWith takes a function which has two arguments: option1 and option2 . In this Angular tutorial, I’m going to share with you how to work with Angular 7|8|9 Select Dropdown. We’ll learn to work with Angular select dropdown with Reactive Forms. In this tutorial i will show you how you can create, implement and validate select dropdown in Angular app.

How to set selected option dynamically in Angular 6, Track state changes and the validity of form controls. You can also use a reactive (or model-driven) approach to build forms. you don't have to do anything to the <form> tag in order to make use of FormsModule . You'll add a select to the form and bind the options to the powers list using ngFor , a technique seen  In this Angular 9 select dropdown example, we will use the Angular Material library to construct UI/UX. Angular Material components will help us in building attractive UI and UX, consistent, and functional web pages and web applications while keeping to modern web design principles like browser portability and compatibility, device independence, and graceful degradation.

Template-driven forms, Along the way, we'll use several techniques to make our component fast and flexible. Note that we also clone the passed options array so that we can filter them later without When the dropdown is closed, we display the selected option label (or When the control's value changes, after applying a debounce, we call the  A few months ago, I wrote an article based on Angular 2 for beginners and today in this article, we will learn about Angular 2 with TypeScript to bind dropdown and select value from dropdown. Angular dropdown is not any big deal; it's the same as Angular 1 but here there are some differences of approach.

Comments
  • I achieve your desired result by calling [attr.value]="v" instead of [value]="v"
  • Worked for me. Thanks.
  • change works whenever the value of select is changed, what if we want to track whenever any value is selected, even if it is the current value? @mumair
  • @MayankSingh above snippet will work great when ever value is changed by user. If I get you correctly you want to set default value OR you want to compare the selected value is equal to current (predefined) value. can you please further explain?
  • I need to add columns to table on select of any value from the dropdown, but a column can be added more than once, by this case I can add columns alternatively but not consecutively. So when i select a dropdown item 2 times is a row, on change will not occur @mumair
  • I wish I could edit the closing tag <select> => </select>
  • if your selectedCity is undefined in the initial state, you define a disabled option that show "select a city" by simply doing: <option [ngValue]="undefined" disabled> Select a city </option>