Angular 2 how can i add click event inside option? - javascript

This is my html,When i click option "new-item" it will open input type box , and then i enter value it want to add to select option
<form (submit)="addItem()">
<input type="text" [(ngModel)]="add.name" name="name">
<input type="text" [(ngModel)]="add.price" name="price">
<input type="text" [(ngModel)]="add.description" name="description">
<select [(ngModel)]="add.type" name="room-type">
<option [value]="c">Select</option>
<option>BreakFast</option>
<option>Lunch</option>
<option>Dinner</option>
<option><button (click)="addSelect()">Add-item</button></option>
<input *ngIf='edited' type="text" >
</select>
and my type script is,
addSelect() {
this.edited = true;
}
constructor() {
this.edited = false;
}

You can't add such an event to an <option>.
You can see that the event doesn't fire in all browsers (the only browsers it works in is < ie11 and Firefox):
$("#trig").click((event) => console.log(event));
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select>
<option>default</option>
<option id="trig">trigger</option>
</select>
The tag does not propagate down any click events. So any click events you try and allocate inside an option will not work. Your best bet is to look at the value you receive in the onChange() callback and then turn on another component which allows the user to enter data. You could even use a window.prompt() to get such data.
You can instead do this:
<select (change)="onChange($event.target.value)">
onChange(val) {
console.log(val);
this.edited = false;
}
For further information on implementing this approach, see: How can I get new selection in "select" in Angular 2?

Related

Getting selected datalist option value, and innerHTML, without using jQuery

I have a situation where I want to let a user decide titles of books that I have on my db, using an input with a datalist (generated by php), after the user picked a title, he would click a submit button and the form would send the title in another file.
Everything worked fine but I didn't realized that I needed to send the ID of the book that the user selected, because there can be more than one book with the same title.
What I would like to have is the option of the datalist, that no longer has the title of the book inside its "value" attribute, but I want that title inside its innerHTML, so that the title gets displayed, while having the ID inside the "value" attribute. My problem is that if I do that, when the user clicks on the datalist option, the ID gets inside the text input, so the user may not know what book he choose.
summing up: I would like to have the datalist that displays the title, when an option is chosen, that title gets displayed in the text input, when I submit, the Id of the book gets sent in "FindBook.php" inside $_POST.
isIn() checks if the title is inside the array of titles, I would need to change that so that it can check if the ID is inside the array of IDs.
<form onsubmit="alert(document.getElementById('number').value);" action="FindBook.php" target="_blank" method="POST">
<input id="number" list="BooksById">
<input type="submit" value="Find">
</form>
<datalist id="BooksById">
<option value="1">Title1</option>
<option value="2">Title2</option>
<option value="3">Title3</option>
<option value="4">Title4</option>
</datalist>
<br>
<form onsubmit="alert(document.getElementById('string').value);" action="FindBook.php" target="_blank" method="POST">
<input id="string" list="booksByTitle">
<input type="submit" value="Find">
</form>
<datalist id="booksByTitle">
<option value="Title1"></option>
<option value="Title2"></option>
<option value="Title3"></option>
<option value="Title4"></option>
</datalist>
Since I don't understand jQuery I would really prefer a solution that doesn't imply that.
I think that in your case you must use a <select> tag instead of a <datalist> because you do not want the end user to enter new names (or yes?). However you can work with the data attributes like in the code below:
HTML:
<input list="titles" id="title-input" oninput="getBookId()">
<datalist id="titles">
<option data-value="5" value="A book name">
</datalist>
JavaScript:
function getBookId() {
var selectedTitle = document.getElementById("title-input").value;
var value2send = document.querySelector(`#titles option[value='${selectedTitle}']`).dataset.value; // Here now you have the book title id.
console.log("getBookId ~ value2send", value2send)
}
I hope it works for you.
Assuming you can provide distinct title values for each datalist option...
Add a dataset attribute, such as data-id, to your datalist option elements, containing the corresponding id, and add a hidden type input to your form. Then use the onsubmit event handler function to get the selected datalist option's dataset id value and assign it to the value of the hidden input:
function findBook(form) {
form.bookid.value = document.querySelector(`datalist option[value="${form.booktitle.value}"]`).dataset.id;
console.log(form.bookid.value);
return false;
}
<form onsubmit="return findBook(this)">
<input type="hidden" name="bookid">
<input name="booktitle" list="BooksById">
<input type="submit" value="Find">
</form>
<datalist id="BooksById">
<option data-id="1" value="Title1">
<option data-id="2" value="Title2">
<option data-id="3" value="Title3">
<option data-id="4" value="Title4">
</datalist>
Upon form submission, your PHP file will have the variables $_POST['bookid'] and $_POST['booktitle'] available.
Thanks for your suggestions. I prefer to use a datalist, instead of a select tag, because it looks more like a dropdown menu that works like a button. Using datalist allows me to find a book by a random word inside the title of it, while the select only finds the first word of an entry. I can also distinguish different books with the same name by another attribute that states if it's available or if it's taken.
I asked for no JQuery, i appreciate your help but I really don't understand them, even if it's cleaner to use them I would like a solution that doesn't use them.
I ended up using the solution CBroe suggested:
document.getElementById("bookTitle").addEventListener('input', function (evt) {
let data = this.value.split('');
document.getElementById("bookId").value = "";
if(isIn(data,'books')){
document.getElementById("bookId").value = data[0];
document.getElementById("bookTitle").value = data[1];
}
});
function checkForm(id, value, list){
if(isIn([document.getElementById(id).value,document.getElementById(value).value],list)){
alert("Book found");
return true;
}else{
alert("not found")
return false;
}
}
function isIn(value, list) {
switch (list) {
case 'books':
//this was generated by php in my code
if (value[0] == 1 && value[1] == "Title1"){
return true;
}
if (value[0] == 2 && value[1] == "Title2"){
return true;
}
return false;
break;
//I've cut out other cases
}
}
<form onsubmit="checkForm('bookId','bookTitle','books')" action="FindBook.php" target="_blank" method="POST">
<input id="bookTitle" list="booksByTitle" autocomplete="off">
<label>id:</label>
<input id="bookId" <!--type="hidden"-->
<input type="submit" value="Find">
</form>
<datalist id="booksByTitle">
<!-- value was generated by php in my code-->
<option value="1Title1">Title1</option>
<option value="2Title2">Title2</option>
</datalist>

Shopify - Debut Theme - Showing A Textbox if Certain Variant is Selected

I'm trying to show my "Embossing" textbox only when the "Style" dropdown option "Embossing" is selected. I've added the below code in my new template, product-customizable-template.liquid, which created the textbox but I want to hide it unless "Embossing" is selected.
<p class="line-item-property__field">
<label for="embossing">Embossing</label>
<input required class="required" id="embossing" type="text" name="properties[Embossing]">
</p>
"Style" Dropdown
The Style textbox has the following code:
<select class="single-option-selector single-option-selector-product-customizable-template product-form__input" id="SingleOptionSelector-0" data-index="option1">
<option value="None" selected="selected">None</option>
<option value="Embossing">Embossing</option>
<option value="Stamp">Stamp</option>
</select>
I am still working on the site, so it is not active right now.
Any help would be greatly appreciated, thank you!
You need to check on-page load and on change of select box using Javascript and you can add and remove custom code to form easily
You can check and try the below snippet for a better idea
// on change test for your condition
document.getElementById('SingleOptionSelector-0').addEventListener('change', function (e) {
_checkAndAppend();
});
// run on page load and check the for value and add if selected value meet condition
_checkAndAppend();
function _checkAndAppend() {
var item = document.getElementById('SingleOptionSelector-0');
var itemValue = document.getElementById('SingleOptionSelector-0').value;
if (itemValue == 'Embossing') {
var input = `<p class="line-item-property__field _embossing">
<label for="embossing">Embossing</label>
<input required class="required" id="embossing" type="text" name="properties[Embossing]">
</p> `;
item.parentNode.insertAdjacentHTML('beforeend',input);
} else {
if(document.querySelector('._embossing')){
document.querySelector('._embossing').remove();
}
}
}

Is there a way to disable a dropdown to users while still being able to submit a form with the disabled dropdown?

I have a dropdown that is disabled to the user. I want for the user to be able to press a button that changes the selected item to a different one. For example: from the 4th item in the dropdown to the 7th.
I've tried disabling the dropdown, but when I do that and submit the form, I get a PHP error saying Undefined index: id.
HTML:
<form>
<select id='id' name='id' autocomplete='none' disabled required>
<option value='2'>apple</option>
<option value='6'>banana</option>
<option value='10'>orange</option>
</select>
<button type='submit'>Submit</button>
</form>
JavaScript:
const dropdown = document.getElementById('dropdown');
const options = dropdown.options;
for (let i = 0; i < options.length; ++i) {
if (options[i].value === id) {
dropdown.selectedIndex = i;
break;
}
}
PHP (This line seems to be the one breaking):
$id = $_POST['id'];
It seems you haven't defined method and action in your form tag. By default, I think, the method is set to 'GET', so when checking 'POST' you'll run into your error.
Therefore, set "method='post'" (and best also an action, e.g. "action='/yourPageName.php') and see if that helps.
I figured out a solution that suits my needs. It was kind of simple. I just enabled the dropdown when I submitted the form, and instantly disabled it again.
id.removeAttribute('disabled');
const data = new FormData(document.getElementById('form'));
id.setAttribute('disabled', '');
request.send(data);
Thanks for the help though :)
A disabled input field will be ignored when you submit the form. I would suggest creating a hidden input field of name="id" if you want the user to view the dropdown but not select it.
<form>
<select id='id' autocomplete='none' disabled required>
<option value='2'>apple</option>
<option value='6'>banana</option>
<option value='10'>orange</option>
</select>
<input type="hidden" name='id' value="6" />
<button type='submit'>Submit</button>
</form>
You can make an hidden input with the id="id" and change the select id to "temp_id". Then, since you are making the request from javascript, you can just update the hidden field before making the request.
<select id='temp_id' autocomplete='none' disabled required>
<option value='2'>apple</option>
<option value='6'>banana</option>
<option value='10>orange</option>
</select>
<input type="hidden" name="id" id="id" value="">
Then, on your javascript, just before you make the request, run the code:
document.getElementById("id").value = document.getElementById("temp_id").value;

how do i make my onchange function generic?

My Javascript function checks for radio button selection and displays the appropriate drop down box. but this code is not generic, i tried using "this" but it doesn't help.. can this actually be generic?
CODE:
function change(s)
{
if(document.getElementById("viewstate").checked==true)
{
document.getElementById("state").style.display="inline";
document.getElementById("cat").style.display="none";
}
else
{
document.getElementById("state").style.display="none";
if(document.getElementById("viewcat").checked==true)
{
document.getElementById("cat").style.display="inline";
}
else
document.getElementById("cat").style.display="none";
}
}
Front end radio button
<input type="radio" name="viewrecord" value="viewstate" onchange="change('state')" required="" id="viewstate"> View by State
<select name="stat" id="state" style="display:none;">
<option selected disabled>Select State</option>
<input type="radio" name="viewrecord" value="viewcat" required="" onchange="change('cat')" id="viewcat">View By Agency
<select id="cat" name="che" style="display:none" required="">
You can try with this snippet
JS
document.addEventListener('click',function(event){
var tar = event.target.id;
if(tar ==="viewstate"){
document.getElementById("state").style.display="inline";
document.getElementById("cat").style.display="none";
}
else if(tar==="viewcat"){
document.getElementById("state").style.display="none";
document.getElementById("cat").style.display="inline";
}
},false)
WORKING COPY
What else I tried?
My primary idea was to add a class to next select tag. For example if you select radio#viewstate it will add a class to closest select element. Then just loop through all the select tag and whoever dont have this class , hide them.
But since you are using display:none nextSibling will not work.For why nextSibling wont work you can take a look at difference between it visibility:hidden
Also note in the demo that I have used label tag with input
If by generic you mean to make the function to be able to work for any similar selection process without depending on the hard-coded values of the selection inputs, this is one way I thought of doing it :
function change(selectorId, selectorClass) {
// Get all the selector elements you use.
var rS = document.getElementsByClassName( selectorClass );
// Out of the elements you fetched above, make the one with
// id = selectorId visible, rest hidden.
for(var i = 0; i < rS.length; ++i)
rS[i].style.display = (rS[i].id == selectorId) ? "inline" : "none";
}
In the HTML part add a class to every select input you want to use with the radio values:
<input type="radio" name="viewrecord" value="viewstate" onchange="change('state', 'record-selector')" required="" id="viewstate"> View by State
<select class='record-selector' name="stat" id="state" style="display:none;">
<option selected disabled>Select State</option>
<input type="radio" name="viewrecord" value="viewcat" required="" onchange="change('cat', 'record-selector')" id="viewcat">View By Agency
<select class='record-selector' id="cat" name="che" style="display:none" required="">
With this you can use the same function for similar selection process on different forms.

How to make the chosen value of select list visible

How I can make the selected choice still visible until I re-choose another one?The list may contain more than 10 options
=====
<form method="get" action="Chairman.php" >
<select name="courses" id="courses" class="styled-select" >
<option value="courses"><--Courses--></option>
<option value="PHYS220">Physics for Engineers</option>
<option value="MATH210">Calculus II</option>
<option value="MATH225">Linear Algebra with Applications</option>
</select>
<input type="submit" value="Search Instructor"
onClick="checkDropdown()"></input>
<div id="error" style="color:red"></div>
=====
Also when I am trying to validate the select list,The error is displayed and then quickly it disappears
<script>
function checkDropdown () {
var courses = document.getElementById('courses');
if(courses.value==="courses") {
document.getElementById('error').innerHTML="PLEASE selecttt";
return false;
}
}
</script>
The select is reset and the error disappears because the form is still posted. The value that you return from the function doesn't stop the submission.
You should use the onsubmit event on the form instead of onclick on the button. Use return in the event code to convey the value from the function back to the event:
<form method="get" action="Chairman.php" onsubmit="return checkDropdown()">

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