javascript - How to normally bind forms in angular -


i have template form, wrote guides , don't work though. have several of models:

export class user {   constructor(public userid?: userid,               public firstname?: string,               public lastname?: string,               public address?: address) {   } }  export class address {   constructor(     public street?: string,     public city?: string,     public zipcode?: string) {   } }

i have component:

component({   templateurl: 'user.html' }) export class mycomponent implements oninit, ondestroy{   user: user;   userform: ngform;   ngoninit(): void {   }

and page itself:

<form novalidate #userform="ngform">       <div class="form-group">          <input required minlength="4" type="text"                id="firstname"                [(ngmodel)]="user.firstname" name="firstname">         <small *ngif="!firstname.valid">not valid!</small>     </div>     <div class="form-group">         <input required ng-minlength="4" type="text"                id="lastname"                [(ngmodel)]="user.lastname" name="lastname">     </div>      <div ngmodelgroup="user.address">         <div class="form-group">             <input required ng-minlength="4"                    type="text"                    id="address-house"                    [(ngmodel)]="user.address.address1" name="address.address1">         </div>          <div class="form-group">             <div class="form-group">                 <input required ng-minlength="4"                        type="text"                        id="zipcode"                        [(ngmodel)]="user.address.zipcode" name="address.zipcode">             </div>             <div>                 <input required ng-minlength="4"                        type="text"                        lass="form-control input-lg"                        id="city"                        [(ngmodel)]="user.address.city" name="address.city">             </div>         </div>      </div>     <button type="button" (click)="checkandproceed()">continue</button>     </div> </form>

the thing want add validation - that's all. none of guides helped. can in-html validation or ts validation? nice call validation when clicking 'continue' button , making valid if so.

in case of validation additionally console error: cannot read property 'valid' of undefined

there lots of attributes on input elements. have name, id, , template reference variable. code missing template reference variable. template reference variable holds onto reference element , has valid, dirty, , other flags associated it.

for example, change code include template reference variable this:

<div class="form-group">     <input required minlength="4" type="text"            id="firstname"            [(ngmodel)]="user.firstname" name="firstname"            #firstnamevar="ngmodel">     <small *ngif="!firstnamevar.valid">not valid!</small> </div>

notice #firstnamevar. template reference variable. can named same thing id , name attributes. named different readily distinguished between other 2 attributes.

notice *ngif changed use firstnamevar.valid

for more information on template reference variables, see this: https://angular.io/guide/template-syntax#ref-vars


Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more