I am facing a problem while trying to listen to the "onclick" event of an html element.
I have attached the images of my dart code and HTML file I am using.
Its throwing the error
"Error: Expected a value of type 'HtmlElement', but got one of type 'Null'"
Here is the Dart Code where I am trying to get the element by id!
HtmlElementView(
onPlatformViewCreated: (id) {
HtmlElement element = document
.querySelector("#form-checkout__issuer") as HtmlElement;
element.onChange.listen(
(event) {
print("this is the current event: $event");
},
);
Here is the HTML Document I am showing in my Flutter Web App
<!-- <div class = "card"> -->
<form id="form-checkout">
<input type="text" name="cardNumber" id="form-checkout__cardNumber" />
<input type="text" name="expirationDate" id="form-checkout__expirationDate" />
<input type="text" name="cardholderName" id="form-checkout__cardholderName"/>
<input type="email" name="cardholderEmail" id="form-checkout__cardholderEmail"/>
<input type="text" name="securityCode" id="form-checkout__securityCode" />
<select name="issuer" id="form-checkout__issuer"></select>
<select name="identificationType" id="form-checkout__identificationType"></select>
<input type="text" name="identificationNumber" id="form-checkout__identificationNumber"/>
<select name="installments" id="form-checkout__installments"></select>
<button type="submit" id="form-checkout__submit">Pay</button>
<progress value="0" class="progress-bar">Loading...</progress>
</form>
<!-- </div> -->
Here are the In App Code images!
Related
I am trying to test a form in Vue, using the forms from the Bootstrap-Vue library.
I have made a an event for the form (submit) and I added a function to this event (addText).
Then I made a method for this function, telling it to log my input data to the console, but when I press the "save" button and go into the console nothing has been logged.
This used to work with Materialize, so I am wondering if the error lies somewhere with the Bootstrap forms.
Any help will be much appreciated.
<template>
<b-container fluid>
<h2>Add or edit content for this section</h2>
<b-form-group #submit="addText">
<div class="fieldHeadline">
<label for="headline">Add headline</label>
<b-form-input type="text" name="headline" v-model="headline"></b-form-input>
</div>
<div class="fieldSecodnaryHeadline">
<label for="secondaryHeadline">Add secondary headline</label>
<b-form-input type="text" name="secondaryHeadline" v-model="secondaryHeadline"></b-form-input>
</div>
<div class="fieldText">
<label for="text">add text</label>
<b-form-input type="text" name="text" v-model="text"></b-form-input>
</div>
<b-button variant="success">Save</b-button>
</b-form-group>
</b-container>
</template>
<script>
export default {
name: 'NewsSectionCreate',
data() {
return {
headline: null,
secondaryHeadline: null,
text: null
}
},
methods: {
addText(){
console.log(this.headline, this.secondaryHeadline, this.text)
}
}
}
</script>
b-form-group is not a form it's layout that structures the label and inputs, in order to submit that inputs you should wrap the b-form-group tags with a b-form component which has #submit event:
<b-form #submit="addText">
<b-form-group >
<div class="fieldHeadline">
<label for="headline">Add headline</label>
<b-form-input type="text" name="headline" v-model="headline"></b-form-input>
</div>
<div class="fieldSecodnaryHeadline">
<label for="secondaryHeadline">Add secondary headline</label>
<b-form-input type="text" name="secondaryHeadline" v-model="secondaryHeadline"></b-form-input>
</div>
<div class="fieldText">
<label for="text">add text</label>
<b-form-input type="text" name="text" v-model="text"></b-form-input>
</div>
<b-button type="submit" variant="success">Save</b-button>
</b-form-group>
</b-form->
don't forget to add type="submit" to the b-button component.
When I am using state variable as a value for the input fields, second input field is not working.
Here is the code:
<input
type="text"
className="form-control"
placeholder="mobileNumber"
onChange={this.handleLoginMobileNumber}
onKeyUp={this.handleLoginMobileNumber}
value={this.state.loginMobileNumber}
/>
<input
type="text"
className="form-control"
placeholder="Passcode"
maxLength="4"
value={this.state.loginPasscode}
/>
<br/>
<button
className="btn btn-large btn-primary medata-login-form-input medata-login-form-submit-button"
onClick={this.submitLogin}>
Log in
</button>
Help me, Thanks.
Issue is, you are using Controlled Component and you forgot to define the onChange method and update the state value with password field, because of that password field is read only.
Check this example:
class App extends React.Component{
constructor(){
super();
this.state = {
loginMobileNumber: '',
loginPasscode: ''
}
}
handleLoginMobileNumber(e){
this.setState({loginMobileNumber: e.target.value})
}
loginPasscode(e){
this.setState({loginPasscode: e.target.password})
}
render(){
return(
<div>
<input
type="text"
className="form-control"
placeholder="mobileNumber"
onChange={this.handleLoginMobileNumber.bind(this)}
value={this.state.loginMobileNumber}
/>
<input
type="password"
className="form-control"
placeholder="Passcode"
maxLength="4"
value={this.state.loginPasscode}
onChange={this.loginPasscode.bind(this)}
/>
</div>
)
}
}
ReactDOM.render(<App/>, document.getElementById('app'))
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id='app'/>
I have a simple AddUser component and in the render function I am returning the following html:
<form ref="form" className="users-form" onSubmit={ this.handleAddNew }>
<input ref="username" type="text" name="username" placeholder="username"
value={this.state.username} onChange={function() {}} /><br />
<input ref="email" type="email" name="email" placeholder="email"
value={this.state.email} onChange={function() {}} /><br />
<button type="submit"> Add User </button>
</form>
I am binding the state of username and email to this.state which I am setting to blank in getInitialState like so:
getInitialState() {
return { username: '', email: '' };
}
I am binding state to the form so I can set it to blank after form submission.
The problem with this setup is that the form now renders as readonly.
I cannot get any user input into either text fields. What am I doing wrong?
Your input fields are controlled components, since you are using the value property. This makes the inputs readonly and they will always reflect the value, the variable (in this case, the state variable) holds. You have to explicitly setState onChange since you are setting username field as a state variable.
Read more about it here
onUserNameChange : function(e){
this.setState({username : e.target.value})
},
render: function(){
return ...
<input ref="username" type="text" name="username" placeholder="username"
value={this.state.username} onChange={this.onUserNameChange} /><br />
...
<button type="submit"> Add User </button>
</form>
}
A better way to do this is :
onChange : function(field,e){
this.setState({field: e.target.value});
},
render : function(){
return <form ref="form" className="users-form" onSubmit={ this.handleAddNew }>
<input ref="username" type="text" name="username" placeholder="username"
value={this.state.username} onChange={this.onChange.bind(this,"username")} /><br />
<input ref="email" type="email" name="email" placeholder="email"
value={this.state.email} onChange={this.onChange.bind(this,"email")} /><br />
<button type="submit"> Add User </button>
</form>
}
It looks like you saw the console warning about controlled fields needing an onChange handler and added one just to shut the warning up :)
If you replace your empty onChange handler functions with onChange={this.handleChange} and add this method to your component, it should work:
handleChange(e) {
this.setState({[e.target.name]: e.target.value})
}
(Or for people not using an ES6 transpiler:)
handleChange: function(e) {
var stateChange = {}
stateChange[e.target.name] = e.target.value
this.setState(stateChange)
}
However, if your component is an ES6 class extending React.Component (instead of using React.createClass()), you will also need to ensure the method is bound to the component instance properly, either in render()...
onChange={this.handleChange.bind(this)}
...or in the constructor:
constructor(props) {
super(props)
// ...
this.handleChange = this.handleChange.bind(this)
}
I have this template:
<Template name="nuevoEjercicio">
<div class="container-fluid">
<div class="form-group">
<input type="text" class="form-control input-lg" name="ejercicio" placeholder="Ejercicio?"/>
<input type="number" class="form-control" name="repeticiones" placeholder="Repeticiones?" />
<input type="number" class="form-control" name="peso" placeholder="Peso?" />
<button type="submit" class="btn btn-success" >
<span class="glyphicon glyphicon-plus"></span>
</button>
</div>
</div>
</Template>
that I use to capture and save to the database.
Then on my .js file I am trying to get the data and save it:
Template.nuevoEjercicio.events({
'click .btn btn-success': function (event) {
var ejercicio = event.target.ejercicio.value;
var repeticiones = event.target.repeticiones.value;
var peso = event.target.peso.value;
ListaRutina.insert({
rutina:"1",
ejercicio:ejercicio,
repeticiones:repeticiones,
peso:peso,
});
// Clear form
event.target.ejercicio.value = "";
event.target.repeticiones.value = "";
event.target.peso.value = "";
// Prevent default form submit
return false;
}
});
}
as I understand, when I click on any object that has the btn btn-success style....but is not the case. For some obscure reason -for me- is not working.
Can you check it and give me some advice?
Thanks!
First of all, there's an error in you selector. It's 'click .btn.btn-success', not 'click .btn btn-success'.
Also you can't do that event.target.ejercicio.value thing. event.target is the element that was clicked. You'll have to do something like this:
'click .btn.btn-success': function (event, template) {
var ejercicio = template.$('[name=ejercicio]').val()
...
OK
What after wasting hours and hours the solution is:
1- on the html file give your input an id:
<input type="number" class="form-control" **id="peso"** placeholder="Peso?" />
<button type="submit" class="btn .btn-success" id="**guardar**" />
so now you want to save data on the input when the button is clicked:
2- You link the button with the funcion via the id
Template.TEMPLATENAMEONHTMLFILE.events({
'click **#guardar**': function (event, template) {
var ejercicio = template.$("**#peso**").val();
and get the value linking using the input id.
I have my form like this:
<form name="myForm">
<input name="myText" type="text" ng-model="mytext" required />
<button disabled="{{ myForm.$invalid }}">Save</button>
</form>
As you may see, the button is disabled if the input is empty but it doesn't change back to enabled when it contains text. How can I make it work?
You need to use the name of your form, as well as ng-disabled: Here's a demo on Plunker
<form name="myForm">
<input name="myText" type="text" ng-model="mytext" required />
<button ng-disabled="myForm.$invalid">Save</button>
</form>
To add to this answer. I just found out that it will also break down if you use a hyphen in your form name (Angular 1.3):
So this will not work:
<form name="my-form">
<input name="myText" type="text" ng-model="mytext" required />
<button ng-disabled="my-form.$invalid">Save</button>
</form>
Selected response is correct, but someone like me, may have issues with async validation with sending request to the server-side - button will be not disabled during given request processing, so button will blink, which looks pretty strange for the users.
To void this, you just need to handle $pending state of the form:
<form name="myForm">
<input name="myText" type="text" ng-model="mytext" required />
<button ng-disabled="myForm.$invalid || myForm.$pending">Save</button>
</form>
If you are using Reactive Forms you can use this:
<button [disabled]="!contactForm.valid" type="submit" class="btn btn-lg btn primary" (click)="printSomething()">Submit</button>
We can create a simple directive and disable the button until all the mandatory fields are filled.
angular.module('sampleapp').directive('disableBtn',
function() {
return {
restrict : 'A',
link : function(scope, element, attrs) {
var $el = $(element);
var submitBtn = $el.find('button[type="submit"]');
var _name = attrs.name;
scope.$watch(_name + '.$valid', function(val) {
if (val) {
submitBtn.removeAttr('disabled');
} else {
submitBtn.attr('disabled', 'disabled');
}
});
}
};
}
);
For More Info click here
<form name="myForm">
<input name="myText" type="text" ng-model="mytext" required/>
<button ng-disabled="myForm.$pristine|| myForm.$invalid">Save</button>
</form>
If you want to be a bit more strict