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OnClick add a row with data from database laravel/js

I have an invoice and I want to add many items. I have a row with a select and two input fields. Select takes data from DB(it takes all items that are on the database) and input fields are for price and quantity.
I have a button Add Item that I want to add another row with specific inputs. My problem is with select because I do not know how to get data from the database to appear in options.
I am displaying the first line with Laravel while at the click of a button I am trying to implement it with JS. I also want to show the price of the selected item depending on the quantity.
<table id="items_table">...</table>
<button id="add_item">Add Item</button>
<script>
let counter = 1;
const items = {!! json_encode($items->toArray()) !!}
$('#add_item').click(function(event){
event.preventDefault();
counter++;
const select = document.createElement('select')
for(let i = 0; i< items.length; i++){
const opt = items[i]
const el = document.createElement('option');
el.textContent = opt.name;
el.value = opt.id;
select.appendChild(el);
}
const newRow = jQuery(
select +
counter + '"/></td><td><input type="text" name="last_name' +
counter + '"/></td></tr>');
$('#items_table').append(newRow);
});
</script>

It looks like you are getting your data types mixed up. You are creating the select element with document.createElement('select') - that returns a HTMLSelectElement and then you are trying to use that as if it was a String. Here is what your issue really is:
const select = document.createElement('select')
console.log(select + "<br>");
// This prints out "[object HTMLSelectElement]<br>"
To solve the issue, you must convert the select to a string of HTML, try something like this
const select = document.createElement('select')
select.innerText = "Test";
const selectAsHTML = select.outerHTML;
console.log(selectAsHTML + "<br>");

how to retrieve dynamically added checkbox selected value

I am adding checkbox dynamically to my html page. how can i retrieve the values when user makes selection.
var sources = source_names_list;
$.each(sources, function(index,value) {
// var checkbox1 = "<label for="+test+"<input type='checkbox' id=\"+test+\" value=\"+test+\" name=\"+test+\"></label>"
// var checkbox="<label for="+value+">"+value+"<input type='checkbox' id="+value+" value="+value+" name="+value+"></label></br>"
var checkbox1 = "<p><label><input type=\"checkbox\" id="+value+" class=\"filled-in\"/><span>" + value + "</span></label></p>"
$("#sources").append($(checkbox1));
});
I tried accessing them using their id and it didn't work.

You could get the values using the class name filled-in as a selector. You will also need to add a value to each generated checkbox.
// Sources
var source_name_list = ['news' , 'info', 'article', 'newyork,items'];
// Create all the checkboxes (adding a value to each one)
$.each(source_name_list, function(index,value) {
var checkbox = '<p><label><input type="checkbox" id="'+value+'" value="' + value + '" class="filled-in" /><span>' + value + '</span></label></p>';
$("#sources").append($(checkbox));
});
// "get selected" button
$('#get').click(function() {
// Create an array for the values
var values = [];
// Select all checkboxes by class name, and use the jQuery :checked special selector
$('.filled-in:checked').each(function() {
// Adds the value to the values array
values.push($(this).val());
});
// Log all values
console.log(values);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="sources"></div>
<a id="get">Get selected</a>

How to get a count of checkboxes checked on pagination Jquery dataTables

Below is my code, I want to get the count of checked checkboxes of all pages in my DataTable. Please advice how to proceed
<td align="center"><input type="checkbox" align="center" id="all" class="groupCheckBox" name="emails[]" value=' . $user['id'] . '></td>
Below code I used for get the values of checked boxes in all pages on button click
$('#merge_button').click(function () {
var id = "";
var oTable = $("#userTable").dataTable();
$(".groupCheckBox:checked", oTable.fnGetNodes()).each(function () {
if (id != "") {
id = id + "," + $(this).val();
} else {
id = $(this).val();
}
document.getElementById("email").value = id;
});
});
but now I want to count the checkedboxes without button click function whenever user clicked on checkboxes and deduct count when unchecking boxes . pls advice

var table = $("#userTable").DataTable();
var countchecked = table
.rows()
.nodes()
.to$() // Convert to a jQuery object
.find('input[type="checkbox"].groupCheckBox:checked').length;
Uses the most recent API
"...please be aware that using deferRender will cause some nodes to be created only when they are required for display, so they might not be immediately available when this method is called." from https://datatables.net/reference/api/rows().nodes()

Quite easy.
$("td input[type='checkbox']:checked").length;

.onchange or .onclick and checkbox value to JS script

I have an array of checkboxes group into class='year'. I would like to call a function in JS when a checkbox is checked.
The html is,
<table class="inner" id="searchTable">
<search>Exam Type:<th>
<?php
foreach($exams as $key=>$value):
echo "<tr><td class='left'><input type='checkbox' class='year' id='$key' name='$key' value='$value'
if ($category['selected'])
{
echo ' checked';
}
> $value</td></tr>";
endforeach; ?>
</table>
This table is inside a form. but I am too worried about the form at the moment.
The JS should create a table with a row when any checkbox is checked.
function yearTable(){
var table = document.getElementById("searchYear");
var row = document.createElement("tr");
var cell = document.createElement("td");
var empty = document.createTextNode("year.value");
/*var empty = document.createTextNode("");*/
cell.appendChild(empty);
row.appendChild(cell);
table.appendChild(row);
}
document.getElementByClassName('year').onchange = yearTable;
I have tried using .onchange and .clicked but neither do anything when a box is checked.
Also I need the value checked in the JS.
I tried year.value but that doesn't work. Prviously I has a select options menu with id = 'exam' and I was able to get the value using exam.value but I can't figure out how to do soemthing equivalent for these checkboxes.
Any help would be greatly appreciated.
Thanks

While an html document may contain only one element with a specific id, there can be several elements with the same class.
So, there is no such a function as document.getElementByClassName. There is a function document.getElementsByClassName, and it returns an array of elements, so could call that function and then iterate over its return value, setting the needed callbacks.
Also, the code you posted must have thrown an exception at this line:
document.getElementByClassName('year')
So if you looked at developer tools in Chrome or Firebug in Firefox, you would probably see an error.

Got it,
function yearTable(){
var year = this.value;
var table = document.getElementById("searchYear");
var row = document.createElement("tr");
var cell = document.createElement("td");
if (this.checked){
var empty = document.createTextNode(year);
}
cell.appendChild(empty);
row.appendChild(cell);
table.appendChild(row);
}
var checkboxes = document.getElementsByClassName('year');
for(var index in checkboxes){
checkboxes[index].onchange = yearTable;
}
Thanks

Getting multiple selected checkbox values in a string in javascript and PHP

I have location name and location Id in database table. Using foreach loop i'm printing the values in checkbox in PHP. I have a submit button which triggers a javascript. I want the user selected all checkbox values separated by comma, in a javascript variable. How can I do this?
<!-- Javascript -->
<script>
function getLoc(){
var all_location_id = document.getElementByName("location[]").value;
var str = <!-- Here I want the selected checkbox values, eg: 1, 4, 6 -->
}
<script>
foreach($cityrows as $cityrow){
echo '<input type="checkbox" name="location[]" value="'.$cityrow['location_id'].'" />'.$cityrow['location'];
echo '<br>';
}
echo '<input name="searchDonor" type="button" class="button" value="Search Donor" onclick="getLoc()" />';

var checkboxes = document.getElementsByName('location[]');
var vals = "";
for (var i=0, n=checkboxes.length;i<n;i++)
{
if (checkboxes[i].checked)
{
vals += ","+checkboxes[i].value;
}
}
if (vals) vals = vals.substring(1);

This is a variation to get all checked checkboxes in all_location_id without using an "if" statement
var all_location_id = document.querySelectorAll('input[name="location[]"]:checked');
var aIds = [];
for(var x = 0, l = all_location_id.length; x < l; x++)
{
aIds.push(all_location_id[x].value);
}
var str = aIds.join(', ');
console.log(str);

var fav = [];
$.each($("input[name='name']:checked"), function(){
fav.push($(this).val());
});
It will give you the value separeted by commas

I you are using jQuery you can put the checkboxes in a form and then use something like this:
var formData = jQuery("#" + formId).serialize();
$.ajax({
type: "POST",
url: url,
data: formData,
success: success
});

In some cases it might make more sense to process each selected item one at a time.
In other words, make a separate server call for each selected item passing the value of the selected item. In some cases the list will need to be processed as a whole, but in some not.
I needed to process a list of selected people and then have the results of the query show up on an existing page beneath the existing data for that person. I initially though of passing the whole list to the server, parsing the list, then passing back the data for all of the patients. I would have then needed to parse the returning data and insert it into the page in each of the appropriate places. Sending the request for the data one person at a time turned out to be much easier. Javascript for getting the selected items is described here: check if checkbox is checked javascript and jQuery for the same is described here: How to check whether a checkbox is checked in jQuery?.

This code work fine for me, Here i contvert array to string with ~ sign
<input type="checkbox" value="created" name="today_check"><strong> Created </strong>
<input type="checkbox" value="modified" name="today_check"><strong> Modified </strong>
<a class="get_tody_btn">Submit</a>
<script type="text/javascript">
$('.get_tody_btn').click(function(){
var ck_string = "";
$.each($("input[name='today_check']:checked"), function(){
ck_string += "~"+$(this).val();
});
if (ck_string ){
ck_string = ck_string .substring(1);
}else{
alert('Please choose atleast one value.');
}
});
</script>