I am writing a recipe web app, I have recipes that all hold an array of ingredients, and this is how I wrote my application
<h2>Add {{addRecipeForm.controls.name.value}}</h2>
<form [formGroup]="addRecipeForm">
<label>Name:</label>
<input type="text" formControlName="name" >
<p *ngIf="addRecipeForm.controls.name.errors">This field is required!</p><p></p>
<label>Serves:</label>
<input type="text" formControlName="serves" >
<p></p>
<label>Steps:</label>
<textarea name="Text1" cols="60" rows="5" type="text" formControlName="steps" ></textarea>
<p></p>
<label>Remarks:</label>
<textarea name="Text1" cols="60" rows="3" type="text" formControlName="remarks" ></textarea>
<p></p>
<hr>
<app-add-ingredient></app-add-ingredient>
<hr>
<button type="submit">Add new recipe</button> <button (click)="goBack()">Back</button>
</form>
I call to show the ingredient adder/lister, how do I send the array the add-ingredient component builds back up to its parent the add-recipe component, I looked into eventemitter but as stated here: What is the proper use of an EventEmitter? it doesnt seem to be a good idea? or atleast not ideal.
If eventemitter is not the best way to pass an array to its parent, what is? a service or some other way?
I have also read the official doc on this sort of thing found here https://angular.io/guide/component-interaction#!#parent-to-child-local-var
but im not sure how to feed an array back to a parent after its been created (inputted via a form by the user) back
the best solution would be to use a service only accessible with the two component.
You will find some examples on the angular doc https://angular.io/guide/component-interaction#parent-and-children-communicate-via-a-service
Related
I am trying to create a view to send an email by attaching a file. I just started coding but not sure how to attach .could anybody help me for this.
here is my small code.
<div>
<div> To</div>
<div><input type="text" name="" placeholder="" size="70" /></div>
</div>
<div>
<div>Subject</div>
<div><input type="text" name="" placeholder="" size="70"/></div>
</div>
after this I have to add image and by click that image I have to attach a file and enter message, then click send button.
You could take a look at the ngDroplet module.
Following this video tutorial, I am trying to bind three text inputs together.
But only the first get updated.
Here is my JsFiddle attempt
the index.html relevant part :
<body ng-app="">
<input type="text" placeholder="Your text" ng-model="data.message"></input>
<h2>{{data.message}}</h2>
<div ng-controller="FirstController">
<input type="text" placeholder="Your text" ng-model="data.message"></input>
<h2>{{data.message}}</h2>
</div>
<div ng-controller="SecondController">
<input type="text" placeholder="Your text" ng-model="data.message"></input>
<h2>{{data.message}}</h2>
</div>
</body>
script.js
function FirstController($scope){
}
function SecondController($scope){
}
What did I miss ?
Please also notice, that I do need the nested div tags and controller, as the purpose is to use scope inheritance.
Also, these global function definitions for the controllers are a choice, as I wanted to keep the video author method for now, in my real projects I will use the best practise which consist of using a module var controller() method).
I have inputs in a web page without the form tag (useless to me).
How can I get their validity status inside the HTML ? This
<input name="myInput" type="text" ng-pattern="/^[0-9]{13}$/">
<input type="button" ng-show="myInput.$valid">
doesn't work.
I'm afraid that won't work without wrapping it in a form as you need to access those fields via the form's controller.
<form name="myForm">
<input name="myInput" type="text" ng-pattern="/^[0-9]{13}$/">
<input type="button" ng-show="myForm.myInput.$valid">
</form>
Should work.
If you're unable to use the form tag for any reason, you'll have to wire that up manually.
Having this ordinary (name attribute is requred by server) form with angular and can't figured out how to make validations work. What should i put into ng-show="TODO"
http://jsfiddle.net/Xk3VB/7/
<div ng-app>
<form ng-init="variants = [{duration:10, price:100}, {duration:30, price:200}]">
<div ng-repeat="variant in variants" ng-form="variant_form">
<div>
<label>Duration:</label>
<input name="variants[{{$index}}][duration]" ng-model="variant.duration" required />
<span ng-show="TODO">Duration required</span>
</div>
<div>
<label>Price:</label>
<input name="variants[{{$index}}][price]" ng-model="variant.price" />
<span ng-show="TODO">Price required</span>
</div>
</div>
</form>
</div>
ps: this is just piece of form, which is more complicated
Thanks
AngularJS relies on input names to expose validation errors.
Unfortunately, as of today it is not possible (without using a custom directive) to dynamically generate a name of an input. Indeed, checking input docs we can see that the name attribute accepts a string only.
Long story short you should rely on ng-form to validate dynamically created inputs. Something like :
<div ng-repeat="variant in variants" >
<ng-form name="innerForm">
<div>
<label>Duration:</label>
<input name="duration" ng-model="variant.duration" required />
<span ng-show="innerForm.duration.$error.required">Duration required</span>
</div>
<div>
<label>Price:</label>
<input name="price" ng-model="variant.price" required/>
<span ng-show="innerForm.price.$error.required">Price required</span>
</div>
</ng-form>
Working fiddle here
UPDATE : Base on your serverside requirement why not do something like that :
<input type="hidden" name="variants[{{$index}}][duration]" ng-model="variant.duration"/>
<input name="duration" ng-model="variant.duration" required />
The hidden input will be the one read by the server while the other one will be used to do the client side validation (later discarded by server). It s kind of an hack but should work.
PS : Be sure that your form is valid before actually submitting it. Can be done with ng-submit
In the following example, message is undefined when I display it in the controller after the event is fired. Why?
<form>
<input type="text" ng-model="message.Title" />
<textarea ng-model="message.Content"></textarea>
<input type="submit" value="Send Message" ng-click="sendMessage(message)" />
</form>
Controller:
$scope.sendMessage = function(message) {
console.log(message);
}
My code seems identical to the documentation here except my controller manages the entire "page" not just the form.
Wow nevermind, apparently when you submit with blank values it doesn't even create the object.
I see you've found your problem, but I'd like to propose a solution to prevent your problem anyway:
<form name="messageForm" ng-submit="sendMessage(message)">
<input type="text" ng-model="message.Title" required/>
<span ng-show="messageForm.title.$error.required && messageForm.title.$dirty">required</span><br/>
<textarea ng-model="message.Content"></textarea>
<input type="submit" value="Send Message" ng-disabled="messageForm.$invalid" />
</form>
The above will make the Title required, display an error message, and disable your submit button if the form isn't valid.