We Keep Coding

how to get input field name through event object in angular 2

I am not sure whether its logical to get.
Here is the html code for my input box.
<input type="text" id="name" #name="ngForm" [ngFormControl]="userProfileForm.controls['name']"
[(ngModel)]="loggedUserInfo.name" (change)="firechange($event,'name')"
/>
and here is my firechange function
firechange($event, field){
if(this.userProfileForm.controls[field].valid){
this._userService.updateUserProfile(this.loggedUserInfo);
this._userService.loadUserData();
}
}
I want to pass only the event in the firechange function and inside the fire change function I want to get the input field name from the event so that I can understand that which input field in my form triggered the event. Expected code will be something like that
[ngFormControl]="userProfileForm.controls['name']"
[(ngModel)]="loggedUserInfo.name" (change)="firechange($event)"
/>
firechange($event){
if(this.userProfileForm.controls[$event.fieldname].valid){
this._userService.updateUserProfile(this.loggedUserInfo);
this._userService.loadUserData();
}
}
My ideal requirement is, in a form there are number of form fields, I don't even want to write firechange function in each individual form field. Is there any generic way to call the event on each input field value change for a particular form without writing it on each input field?

To get the actual name of the element you can do the following:
firechange(event){
var name = event.target.attributes.getNamedItem('ng-reflect-name').value;
console.log('name')
}

If the id is the same as the name you are passing you can get the name like
firechange(event){
if(this.userProfileForm.controls[$event.target.id].valid){
}

If you want to get hold of the element from within your fire change function you may want to try something like:
firechange(event){
let theElement = event.target;
// now theElement holds the html element which you can query for name, value and so on
}
If you in addition you want to instruct your component to apply the firechange() logic on all of your input fields with one single instruction in your component (and not having to specify this on every single input field) than I suggest you to look at in Angular2 how to know when ANY form input field lost focus.
I hope this helps

If id is not the same or it can change, here's more leverage...
You may want to reflect the [name] property the the element's attribute:
... #input [name]="item.name" [attr.name]="item.name" (change)="fn(input)" ...
Then,
...
fn(input) {
log(input.name); // now it returns the name
}
...
See more here

Try this:
<input type="text" (change)="firechange($event.target.value)">

This worked for me in Angular 10
$event.source.name

How to set prefilled input field active with Jquery/javascript?

I'm using a calculator widget where I can enter random values into an inputfield and then the widget automatically calculates when clicking the "go"-button.
Now I want to insert/prefill the value into this input field, since the value which needs to be calculated comes from a server. The issue though is, that this input field apparently only reacts on keypress. I tried to do this:
$('input[name="value"][data-type-money]').val('150.000').focus();
and
$('input[name="value"][data-type-money]').val('150.000').select();
which prefills the input field with the desired value but when I click the "go" button the calculation fails as long I dont enter the value manually into the input field. So, in the end my solution does not work.
Does anyone know how I can solve this?

If data changes frequently you can also use the setInterval function:
<input name="value" data-type-money="money">
setInterval (function(){
var moneyValue = "150.000";
$('input[name="value"][data-type-money]').val(moneyValue);
},1000);
fiddle here: http://jsfiddle.net/85pbnnu1/
or you can just do:
$(document).ready(function(){
$('input[name="value"][data-type-money]').val('150.000').change();
});

Edit, Updated
the input field is -
and reacts only on keypress, I mean when value is entered manually
If input value property cannot be changed , try replacing the element in DOM with value set at html using .replaceWith()
$('input[name="value"][data-type-money]')
.replaceWith("<input name=value data-type-money type=text value=150.00 />")
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js">
</script>
<input name="value" data-type-money type="text" />

html catch event when user is typing into a text input

Im just wondering how I go about catching the event when the user is typing into a text input field on my web application.
Scenario is, I have a contacts listing grid. At the top of the form the user can type the name of the contact they are trying to find. Once there is more than 1 character in the text input I want to start searching for contacts in the system which contain those characters entered by the user. As they keep typing the data changes.
All it is really is a simple type ahead type functionality (or autocomplete) but I want to fire off data in a different control.
I can get the text out of the input once the input has lost focus fine, but this doesnt fit the situation.
Any ideas?
Thanks

Use the keyup event to capture the value as the user types, and do whatever it is you do to search for that value :
$('input').on('keyup', function() {
if (this.value.length > 1) {
// do search for this.value here
}
});
Another option would be the input event, that catches any input, from keys, pasting etc.

Why not use the HTML oninput event?
<input type="text" oninput="searchContacts()">

I would use the 'input' and 'propertychange' events. They fire on cut and paste via the mouse as well.
Also, consider debouncing your event handler so that fast typists are not penalized by many DOM refreshes.

see my try:
you should put .combo after every .input classes.
.input is a textbox and .combo is a div
$(".input").keyup(function(){
var val = this.value;
if (val.length > 1) {
//you search method...
}
if (data) $(this).next(".combo").html(data).fadeIn(); else $(this).next(".combo").hide().html("");
});
$(".input").blur(function(){
$(this).next(".combo").hide();
});

html <input type="text" /> onchange event not working

I am trying to do some experiment. What I want to happen is that everytime the user types in something in the textbox, it will be displayed in a dialog box. I used the onchange event property to make it happen but it doesn't work. I still need to press the submit button to make it work. I read about AJAX and I am thinking to learn about this. Do I still need AJAX to make it work or is simple JavaScript enough? Please help.
index.php
<script type="text/javascript" src="javascript.js"> </script>
<form action="index.php" method="get">
Integer 1: <input type="text" id="num1" name="num1" onchange="checkInput('num1');" /> <br />
Integer 2: <input type="text" id="num2" name="num2" onchange="checkInput('num2');" /> <br />
<input type="submit" value="Compute" />
</form>
javascript.js
function checkInput(textbox) {
var textInput = document.getElementById(textbox).value;
alert(textInput);
}

onchange is only triggered when the control is blurred. Try onkeypress instead.

Use .on('input'... to monitor every change to an input (paste, keyup, etc) from jQuery 1.7 and above.
For static and dynamic inputs:
$(document).on('input', '.my-class', function(){
alert('Input changed');
});
For static inputs only:
$('.my-class').on('input', function(){
alert('Input changed');
});
JSFiddle with static/dynamic example: https://jsfiddle.net/op0zqrgy/7/

HTML5 defines an oninput event to catch all direct changes. it works for me.

Checking for keystrokes is only a partial solution, because it's possible to change the contents of an input field using mouse clicks. If you right-click into a text field you'll have cut and paste options that you can use to change the value without making a keystroke. Likewise, if autocomplete is enabled then you can left-click into a field and get a dropdown of previously entered text, and you can select from among your choices using a mouse click. Keystroke trapping will not detect either of these types of changes.
Sadly, there is no "onchange" event that reports changes immediately, at least as far as I know. But there is a solution that works for all cases: set up a timing event using setInterval().
Let's say that your input field has an id and name of "city":
<input type="text" name="city" id="city" />
Have a global variable named "city":
var city = "";
Add this to your page initialization:
setInterval(lookForCityChange, 100);
Then define a lookForCityChange() function:
function lookForCityChange()
{
var newCity = document.getElementById("city").value;
if (newCity != city) {
city = newCity;
doSomething(city); // do whatever you need to do
}
}
In this example, the value of "city" is checked every 100 milliseconds, which you can adjust according to your needs. If you like, use an anonymous function instead of defining lookForCityChange(). Be aware that your code or even the browser might provide an initial value for the input field so you might be notified of a "change" before the user does anything; adjust your code as necessary.
If the idea of a timing event going off every tenth of a second seems ungainly, you can initiate the timer when the input field receives the focus and terminate it (with clearInterval()) upon a blur. I don't think it's possible to change the value of an input field without its receiving the focus, so turning the timer on and off in this fashion should be safe.

onchange only occurs when the change to the input element is committed by the user, most of the time this is when the element loses focus.
if you want your function to fire everytime the element value changes you should use the oninput event - this is better than the key up/down events as the value can be changed with the user's mouse ie pasted in, or auto-fill etc
Read more about the change event here
Read more about the input event here

use following events instead of "onchange"
- onkeyup(event)
- onkeydown(event)
- onkeypress(event)

Firstly, what 'doesn't work'? Do you not see the alert?
Also, Your code could be simplified to this
<input type="text" id="num1" name="num1" onkeydown="checkInput(this);" /> <br />
function checkInput(obj) {
alert(obj.value);
}

I encountered issues where Safari wasn't firing "onchange" events on a text input field. I used a jQuery 1.7.2 "change" event and it didn't work either. I ended up using ZURB's textchange event. It works with mouseevents and can fire without leaving the field:
http://www.zurb.com/playground/jquery-text-change-custom-event
$('.inputClassToBind').bind('textchange', function (event, previousText) {
alert($(this).attr('id'));
});

A couple of comments that IMO are important:
input elements not not emitting 'change' event until USER action ENTER or blur await IS the correct behavior.
The event you want to use is "input" ("oninput"). Here is well demonstrated the different between the two: https://javascript.info/events-change-input
The two events signal two different user gestures/moments ("input" event means user is writing or navigating a select list options, but still didn't confirm the change. "change" means user did changed the value (with an enter or blur our)
Listening for key events like many here recommended is a bad practice in this case. (like people modifying the default behavior of ENTER on inputs)...
jQuery has nothing to do with this. This is all in HTML standard.
If you have problems understanding WHY this is the correct behavior, perhaps is helpful, as experiment, use your text editor or browser without a mouse/pad, just a keyboard.
My two cents.

onkeyup worked for me. onkeypress doesn't trigger when pressing back space.

It is better to use onchange(event) with <select>.
With <input> you can use below event:
- onkeyup(event)
- onkeydown(event)
- onkeypress(event)

when we use onchange while you are typing in input field – there’s no event. But when you move the focus somewhere else, for instance, click on a button – there will be a change event
you can use oninput
The oninput event triggers every time after a value is modified by the user.Unlike keyboard events, it triggers on any value change, even those that does not involve keyboard actions: pasting with a mouse or using speech recognition to dictate the text.
<input type="text" id="input"> oninput: <span id="result"></span>
<script>
input.oninput = function() {
console.log(input.value);
};
</script>
If we want to handle every modification of an <input> then this event is the best choice.

I have been facing the same issue until I figured out how to do it. You can utilize a React hook, useEffect, to write a JS function that will trigger after React rendering.
useEffect(()=>{
document.title='fix onChange with onkeyup';
const box = document.getElementById('changeBox');
box.onkeyup = function () {
console.log(box.value);
}
},[]);
Note onchange is not fired when the value of an input is changed. It is only changed when the input’s value is changed and then the input is blurred. What you’ll need to do is capture the keypress event when fired in the given input and that's why we have used onkeyup menthod.
In the functional component where you have the <Input/> for the <form/>write this
<form onSubmit={handleLogin} method='POST'>
<input
aria-label= 'Enter Email Address'
type='text'
placeholder='Email Address'
className='text-sm text-gray-base w-full mr-3 py-5 px-4 h-2 border border-gray-primary rounded mb-2'
id='changeBox'
/>
</form>
Resulting Image :
Console Image

try onpropertychange.
it only works for IE.

Dojo: dojo onblur events

I have a form setup with dojo 1.5. I am using a dijit.form.ComboBox and a dijit.form.TextBox
The Combobox has values like "car","bike","motorcycle" and the textbox is meant to be an adjective to the Combobox.
So it doesn't matter what is in the Combobox but if the ComboBox does have a value then something MUST be filled in the TextBox. Optionally, if nothing is in the ComboBox, then nothing can be in the TextBox and that is just fine. In fact if something isn't in the Combobox then nothing MUST be in the text box.
In regular coding I would just use an onBlur event on the text box to go to a function that checks to see if the ComboBox has a value. I see in dojo that this doesn't work... Code example is below...
Vehicle:
<input dojoType="dijit.form.ComboBox"
store="xvarStore"
value=""
searchAttr="name"
name="vehicle_1"
id="vehicle_1"
/>
Descriptor:
<input type="text"
dojoType="dijit.form.TextBox"
value=""
class=lighttext
style="width:350px;height:19px"
id="filter_value_1"
name="filter_value_1"
/>
My initial attempt was to add an onBlur within the Descriptor's <input> tag but discovered that that doesn't work.
How does Dojo handle this? Is it via a dojo.connect parameter? Even though in the example above the combobox has an id of "vehicle_1" and the text box has an id of "filter_value_1", there can be numerous comboboxes and textboxes numbering sequentially upward. (vehicle_2, vehicle_3, etc)
Any advice or links to resources would be greatly appreciated.

To add the onBlur event you should use dojo.connect():
dojo.connect(dojo.byId("vehicle_1"), "onBlur", function() { /* do something */ });
If you have multiple inputs that you need to connect this to, consider adding a custom class for those that need to blur and using dojo.query to connect to all of them:
Vehicle:
<input dojoType="dijit.form.ComboBox"
store="xvarStore"
class="blurEvent"
value=""
searchAttr="name"
name="vehicle_1"
id="vehicle_1"
/>
dojo.query(".blurEvent").forEach(function(node, index, arr) {
dojo.connect(node, "onBlur", function() { /* do something */ });
});
In the function that is passed to dojo.connect you could add in some code to strip out the number on the end and use it to reference each filter_value_* input for validation.
dojo.connect()
Combobox documention

onBlur seems to work just fine for me, even in the HTML-declared widgets. Here's a very rudimentary example:
http://jsfiddle.net/kfranqueiro/BWT4U/
(Have firebug/webkit inspector/IE8 dev tools open to see console.log messages.)
However, for a more ideal solution to this, you might also be interested in some other widgets...
http://dojotoolkit.org/reference-guide/dijit/form/ValidationTextbox.html
http://dojotoolkit.org/reference-guide/dijit/form/Form.html
Hopefully this can get you started.