{"id":26015,"date":"2024-02-21T10:40:11","date_gmt":"2024-02-21T09:40:11","guid":{"rendered":"https:\/\/www.codemotion.com\/magazine\/?p=26015"},"modified":"2024-02-21T11:05:35","modified_gmt":"2024-02-21T10:05:35","slug":"angular-model-inputs-two-way-binding-inputs-with-signals","status":"publish","type":"post","link":"https:\/\/www.codemotion.com\/magazine\/frontend\/angular-model-inputs-two-way-binding-inputs-with-signals\/","title":{"rendered":"Angular Model Inputs: two-way binding inputs with\u00a0Signals"},"content":{"rendered":"\n


Angular v17.2.0<\/strong> introduces a new api to allow two-way binding with Signal Inputs: Model Inputs<\/strong>.<\/p>\n\n\n\n

Before proceeding, I kindly suggest you to read my previous article \u201cAngular Signal Inputs: road to Signal Components<\/a><\/strong>\u201d, in which I discussed about Signal Inputs and how they work. <\/p>\n\n\n\n

This article is strictly connected to the previous, and is meant to fulfill the open point about the two-way binding<\/strong> with Signal Inputs<\/strong>.<\/p>\n\n\n\n

Now that Model Inputs<\/strong> are available it\u2019s time to dive deeper into them.<\/p>\n\n\n\n

\n

\u26a0\ufe0f ALERT:<\/strong> new Model Inputs <\/strong>are still in developer preview \u26a0\ufe0f<\/p>\n<\/blockquote>\n\n\n\n

\n\n\n\n

How to create a Model Input<\/h3>\n\n\n\n

Just like Signal Inputs, Model Inputs<\/strong> are meant to replace classic inputs created with the @Input( )<\/strong> decorator, exposing the input value as a Signal.<\/p>\n\n\n\n

To create a Model Input<\/strong> you just need to use the model( )<\/strong> function provided by @angular\/core<\/strong> package:<\/p>\n\n\n

import<\/span> { Component, model, ModelSignal } from<\/span> '@angular\/core'<\/span>;\n<\/span><\/span>\n<\/span><\/span>@Component<\/span>({ ... })\n<\/span><\/span>export<\/span> class<\/span> MyComponent {\n<\/span><\/span>  myProp: ModelSignal<string<\/span> | undefined<\/span>> = model<string<\/span>>();\n<\/span><\/mark>}\n<\/span><\/span><\/code><\/span>Code language:<\/span> TypeScript<\/span> (<\/span>typescript<\/span>)<\/span><\/small><\/pre>\n\n\n
Your input will be typed as ModelSignal<\/strong>, a special type of Signal that Angular internally updates whenever a new value is bound.<\/p>\n\n\n\n
The update( ) function<\/h4>\n\n\n\n
Two-way binding allows both parent and child components to update the value of a bonded input and to share then the same identical value.<\/p>\n\n\n\n
To enable the update from the child component, ModelSignal<\/strong> api exposes a dedicated update( )<\/strong> function to update an input based on the current value:<\/p>\n\n\n
updateProp(): void<\/span> {\n<\/span><\/span>  this<\/span>.myProp.update((current<\/span><\/span>) =><\/span> current + ' - Updated!!!'<\/span>);\n<\/span><\/mark>}\n<\/span><\/span><\/code><\/span>Code language:<\/span> TypeScript<\/span> (<\/span>typescript<\/span>)<\/span><\/small><\/pre>\n\n\n
The two-way binding<\/strong><\/h4>\n\n\n\n
Using Angular\u2019s two-way binding<\/strong> syntax when binding a value from the parent component to the child component, the ModelSignal <\/strong>update from the child component will therefore go back up to the parent component:<\/p>\n\n\n
<my-component<\/span><\/span>\n<\/span><\/span>  [(myProp<\/span>)]=\"parentProp\"<\/span><\/span>\n<\/span><\/mark>  (myPropChange<\/span>)=\"onPropChangeMethod($event)\"<\/span><\/span>\n<\/span><\/mark>><\/span><\/my-component<\/span>><\/span>\n<\/span><\/span><\/code><\/span>Code language:<\/span> HTML, XML<\/span> (<\/span>xml<\/span>)<\/span><\/small><\/pre>\n\n\n
Both parent and child component will have the property value synced.
The parent component will also get an output notification named as the input name with Change<\/strong><\/code> appended, carrying the new value as event object.<\/p>\n\n\n\n
\n\n\n\n
Model Inputs with default and required values<\/h3>\n\n\n\n
As you probably noticed in the previous examples, by creating a Model Input<\/strong> you can provide to the model( )<\/strong> function a type argument to define the type of the ModelSignal<\/strong> value:<\/p>\n\n\n
import<\/span> { Component, model, ModelSignal } from<\/span> '@angular\/core'<\/span>;\n<\/span><\/span>\n<\/span><\/span>@Component<\/span>({ ... })\n<\/span><\/span>export<\/span> class<\/span> MyComponent {\n<\/span><\/span>  myProp: ModelSignal<string<\/span> | undefined<\/span>> = model<string<\/span>>();\n<\/span><\/mark>}\n<\/span><\/span><\/code><\/span>Code language:<\/span> TypeScript<\/span> (<\/span>typescript<\/span>)<\/span><\/small><\/pre>\n\n\n
Due to the optional<\/strong> nature of the input value, ModelSignal<\/strong> values are typed as possibly undefined.<\/strong><\/p>\n\n\n\n
To get rid of those, you can provide a default value<\/strong> to the model( )<\/strong> function:<\/p>\n\n\n
myProp: ModelSignal<string<\/span>> = model('default'<\/span>);\n<\/span><\/span><\/code><\/span>Code language:<\/span> TypeScript<\/span> (<\/span>typescript<\/span>)<\/span><\/small><\/pre>\n\n\n
Alternatively, you can define your Model Inputs<\/strong> as required thought a dedicated model.required( )<\/strong> function:<\/p>\n\n\n
myRequiredProp: ModelSignal<string<\/span>> = model.required<string<\/span>>();\n<\/span><\/span><\/code><\/span>Code language:<\/span> TypeScript<\/span> (<\/span>typescript<\/span>)<\/span><\/small><\/pre>\n\n\n
\n\n\n\n
Input options: alias and transform function<\/h3>\n\n\n\n
As classic Angular inputs, Model Inputs <\/strong>support also the alias<\/strong> option:<\/p>\n\n\n
myProp = model('default-value'<\/span>, { alias: 'myPropAlias'<\/span> });\n<\/span><\/span><\/code><\/span>Code language:<\/span> TypeScript<\/span> (<\/span>typescript<\/span>)<\/span><\/small><\/pre>\n\n\n
Allowing us to decouple the child component input variable name and the DOM property name used by parent components to bound the input value:<\/p>\n\n\n
<my-component<\/span> [(myPropAlias<\/span>)]=\"parentProp\"<\/span>><\/span><\/my-component<\/span>><\/span>\n<\/span><\/span><\/code><\/span>Code language:<\/span> HTML, XML<\/span> (<\/span>xml<\/span>)<\/span><\/small><\/pre>\n\n\n
Where is the transform( ) function?<\/h4>\n\n\n\n
Regarding the transform( )<\/strong> function, the last classic inputs option we are familiar with, the model( )<\/strong> function does not support it.<\/p>\n\n\n\n
This make sense to me, just think about the conflicts between the two-way nature of Model Inputs<\/strong>, and the role of the transform( )<\/strong> function to transform the input value only inside a component.<\/p>\n\n\n\n
Luckily, you can overcome this absence using the computed( )<\/strong> function, which allows you to define derived values starting from a Signal:<\/p>\n\n\n
import<\/span> { Component, computed, model, ModelSignal, Signal } from<\/span> '@angular\/core'<\/span>;\n<\/span><\/span>\n<\/span><\/span>@Component<\/span>({ ... })\n<\/span><\/span>export<\/span> class<\/span> MyComponent {\n<\/span><\/span>  myProp: ModelSignal<string<\/span>> = model('default'<\/span>);\n<\/span><\/mark>\n<\/span><\/span>  myComposedProp: Signal<number<\/span>> = computed(\n<\/span><\/mark>    ()<\/span> =><\/span> this<\/span>.modelOptional()?.length || 0<\/span>\n<\/span><\/mark>  );\n<\/span><\/mark>}\n<\/span><\/span><\/code><\/span>Code language:<\/span> TypeScript<\/span> (<\/span>typescript<\/span>)<\/span><\/small><\/pre>\n\n\n
In this way the value defined using the computed( )<\/strong> function is confined inside child component.<\/p>\n\n\n\n
\n\n\n\n
Thanks for reading so far \ud83d\ude4f<\/h3>\n\n\n\n
That\u2019s all about Model Inputs<\/strong>.<\/p>\n\n\n\n
If you did not, I recommend you to read my previous article \u201cAngular Signal Inputs: road to Signal Components<\/a><\/strong>\u201d. 
There you will found a more exhaust explanation about the advantages of using Signal Inputs<\/strong> and Model Inputs<\/strong>.<\/p>\n\n\n\n
As always, I\u2019d like to have your feedback. \ud83d\udc4b<\/p>\n","protected":false},"excerpt":{"rendered":"
Angular v17.2.0 introduces a new api to allow two-way binding with Signal Inputs: Model Inputs. Before proceeding, I kindly suggest you to read my previous article \u201cAngular Signal Inputs: road to Signal Components\u201d, in which I discussed about Signal Inputs and how they work.  This article is strictly connected to the previous, and is meant… Read more<\/a><\/p>\n","protected":false},"author":200,"featured_media":26069,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","_uag_custom_page_level_css":"","_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[6],"tags":[4141],"collections":[],"class_list":{"0":"post-26015","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-frontend","8":"tag-angular","9":"entry"},"yoast_head":"\nAngular Model Inputs: two-way binding inputs with\u00a0Signals - 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Before proceeding, I kindly suggest you to read my previous article \u201cAngular Signal Inputs: road to Signal Components\u201d, in which I discussed about Signal Inputs and how they work.  This article is strictly connected to the previous, and is meant……","lang":"en","_links":{"self":[{"href":"https:\/\/www.codemotion.com\/magazine\/wp-json\/wp\/v2\/posts\/26015","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.codemotion.com\/magazine\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.codemotion.com\/magazine\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.codemotion.com\/magazine\/wp-json\/wp\/v2\/users\/200"}],"replies":[{"embeddable":true,"href":"https:\/\/www.codemotion.com\/magazine\/wp-json\/wp\/v2\/comments?post=26015"}],"version-history":[{"count":2,"href":"https:\/\/www.codemotion.com\/magazine\/wp-json\/wp\/v2\/posts\/26015\/revisions"}],"predecessor-version":[{"id":26074,"href":"https:\/\/www.codemotion.com\/magazine\/wp-json\/wp\/v2\/posts\/26015\/revisions\/26074"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.codemotion.com\/magazine\/wp-json\/wp\/v2\/media\/26069"}],"wp:attachment":[{"href":"https:\/\/www.codemotion.com\/magazine\/wp-json\/wp\/v2\/media?parent=26015"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.codemotion.com\/magazine\/wp-json\/wp\/v2\/categories?post=26015"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.codemotion.com\/magazine\/wp-json\/wp\/v2\/tags?post=26015"},{"taxonomy":"collections","embeddable":true,"href":"https:\/\/www.codemotion.com\/magazine\/wp-json\/wp\/v2\/collections?post=26015"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}