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How can I remove a JSON inside a JSON by a key using jQuery?

I have the following JSON structure:
[
{"key":1,"idProduct":"Monitor","obsProduct":""},
{"key":2,"idProduct":"Mouse","obsProduct":""},
{"key":3,"idProduct":"Keyboard","obsProduct":""},
{"key":4,"idProduct":"Processor","obsProduct":""}
]
And the following HTML table (representing the JSON):
When user click on "Remove" button, I need to remove the corresponding iten on JSON. When user click, I can capture the key, so I need to remove iten using the key value.
Assuming that the user click on "Remove" button on "Mouse", so, the JSON needs to return that way:
[
{"key":1,"idProduct":"Monitor","obsProduct":""},
{"key":3,"idProduct":"Keyboard","obsProduct":""},
{"key":4,"idProduct":"Processor","obsProduct":""}
]
How can I do this?
HTML of table:
<div class="row">
<div class="col-md-12">
<div class="table-responsive">
<table class="table table-bordered table-hover" id="table-products">
<thead style="background-color: #f2f2f2">
<tr class="text-center">
<th style="width: 40%">Product</th>
<th style="width: 40%">Obs</th>
<th style="width: 20%">Action</th>
</tr>
</thead>
<tbody>
<tr>
<td colspan="3">No iten!</td>
</tr>
<!-- Will be generated! -->
</tbody>
</table>
</div>
</div>
</div>
JS that generates the lines:
var i = 1;
var itensArray = [];
var nameProduct = $("input[name='nameProd']").val();
var obsProduct = $("input[name='obsProd']").val();
if(i <= 5)
{
var newItem = '<tr class="itemRow"><td>' + nameProduct + '</td><td>' + obsProduct + '</td><td><button type="button" name="' + i + '" class="btn btn-outline-danger btn-sm" id="btnRemoveProduct"><i class="far fa-trash-alt"></i> Remove</button></td></tr>';
if(i == 1)
$("#table-products tbody").html(newItem);
else
$("#table-products tbody").append(newItem);
var products = {
key: i,
idProduct: nameProduct,
obsProduct: obsProduct
};
itensArray.push(products)
var aux = JSON.stringify(itensArray);
i++;
console.log(aux);
}
JS that remove lines from table:
$("#table-products").on('click', '#btnRemoveItem', function(){
var idProduct = $(this).attr("name");
$(this).closest('tr').remove();
toastr.success('Iten removed!');
i--;
if(i == 1)
{
var defaultItem = '<tr><td colspan="3">No iten added!</td></tr>';
$("#table-products tbody").html(defaultItem);
}
/* I NEED TO PUT HERE THE CODE TO REMOVE ITEM FROM JSON */
});

Iterating through the array of objects and finding the matching object having key as the key value which is captured when clicking on remove button.
var itensArray = [
{"key":1,"idProduct":"Monitor","obsProduct":""},
{"key":2,"idProduct":"Mouse","obsProduct":""},
{"key":3,"idProduct":"Keyboard","obsProduct":""},
{"key":4,"idProduct":"Processor","obsProduct":""}
];
//key is captured in a variable on click of remove button.
var idProduct = 2;
for (var i = 0; i < itensArray.length; i++) {
var obj = itensArray[i];
if (obj.key === idProduct) {
itensArray.splice(i, 1);
}
}
console.log(itensArray);

The simplest way is to assing some id to button which responds entry id. While delete button is clicked you can extract ID from button and you know which row to delete.

You said you can capture the key, so I'm assuming you've got some kind of click handler function that's receiving that key. From there the best way to do it is probably to create a new array that filters out the element that matches, and replace the old array with the new. (Generally considered a better practice than mutating the array in place with something like .splice)
const capturedKey = event.target.value // or however you're capturing it
yourArray = yourArray.filter(obj => obj.key !== capturedKey)

You can find the index using Array.findIndex (It will return on the first match so it is an optimized way if your 'key' values are unique)
const myArray = [
{"key":1,"idProduct":"Monitor","obsProduct":""},
{"key":2,"idProduct":"Mouse","obsProduct":""},
{"key":3,"idProduct":"Keyboard","obsProduct":""},
{"key":4,"idProduct":"Processor","obsProduct":""}
];
const idToDelete = 2; // retrieved via clicked btn
const idx = myArray.findIndex( item => item.key == idToDelete );
if(idx != -1) {
myArray.splice(idx, 1);
}
console.log(myArray)

Finding last occurrence of text

I have the following type of table in html, which is generated dynamically by php :
<tr><td>Kiss the Girls</td><td>2016-01-01</td></tr>
<tr><td>Kiss the Girls</td><td>2016-02-05</td></tr>
<tr><td>Along Came a Spider</td><td>2016-01-07</td></tr>
<tr><td>Along Came a Spider</td><td>2016-01-22</td></tr>
<tr><td>Along Came a Spider</td><td>2016-03-31</td></tr>
I would like to be able to have a dynamic display filter that would allow the user to click a box and hide all but the latest version of the manuscript. So it might look like :
<tr><td>Kiss the Girls</td><td>2016-02-05</td></tr>
<tr><td>Along Came a Spider</td><td>2016-03-31</td></tr>
At this point none of the <tr> or <td> tags have an id or a class, but I could easily add a class to the first column (e.g., <td class='bookTitle'>). There is only one table on the page and php sorts it by date already. I'm open to jQuery or native JavaScript, though I would think this would be easier with jQuery. Seems like it could be done by just grabbing the last row before it changes names, but I'm not sure how to do that. Any thoughts?

According to 'Seems like it could be done by just grabbing the last row before it changes names', this is what I've come out with:
var rows = $("table tr");
if(rows.length > 0){
var last = $(rows[0]).find('td')[0].innerText;
for(var i=1; i<rows.length; i++){
var row = $(rows[i]);
var text = row.find('td')[0].innerText;
if(text === last){
$(rows[i-1]).hide();
}
last = text;
}
}
See the Pen Finding last occurrence of text by Tan Li Hau (#tanhauhau) on CodePen.

Iterate over the tr and store in key value pair where key as td content and value as object, after get the objects from it.
var a = {}; // object for storing dom element object
$('table tr').each(function() {
a[$('td:first', this).text().trim()] = this; // update the dom element object based on the column
});
var $res = $($.map(a, function(v) {
return v; // get objects and convert to jQuery object
}));
console.log($res);
$res.css('color', 'red');
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<table>
<tr>
<td>Kiss the Girls</td>
<td>2016-01-01</td>
</tr>
<tr>
<td>Kiss the Girls</td>
<td>2016-02-05</td>
</tr>
<tr>
<td>Along Came a Spider</td>
<td>2016-01-07</td>
</tr>
<tr>
<td>Along Came a Spider</td>
<td>2016-01-22</td>
</tr>
<tr>
<td>Along Came a Spider</td>
<td>2016-03-31</td>
</tr>
</table>
FYI : If you want to maintain the order then the value with index and object array and set order based on that

You could iterate in reverse and remove everything you've seen before as you go:
function filterPreviousVersions ( ) {
var seen = {};
$( $('tr').get( ).reverse( ) ).each( function ( ) {
var text = $( 'td', this ).first( ).text();
if ( seen[ text ] )
$( this ).remove();
seen[ text ] = true;
} );
}
filterPreviousVersions();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<table>
<tr>
<td>Kiss the Girls</td>
<td>2016-01-01</td>
</tr>
<tr>
<td>Kiss the Girls</td>
<td>2016-02-05</td>
</tr>
<tr>
<td>Along Came a Spider</td>
<td>2016-01-07</td>
</tr>
<tr>
<td>Along Came a Spider</td>
<td>2016-01-22</td>
</tr>
<tr>
<td>Along Came a Spider</td>
<td>2016-03-31</td>
</tr>
</table>

If you add ids in increasing order as you add the rows,
You may use this :
var valArray = [];
$('.maindiv').each(function() {
valArray.push(parseInt($(this).attr('id'), 10));
})
valArray.sort(function(a, b) {
return a - b
})
alert("Last row : " + document.getElementById(valArray[valArray.length - 1]).innerHTML); // highest`
alert("Second last : " + document.getElementById(valArray[valArray.length - 2]).innerHTML);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="2" class="maindiv">Contents in row 2</div>
<div id="5" class="maindiv">Contents in row 5</div>
<div id="3" class="maindiv">Contents in row 3</div>
<div id="1" class="maindiv">Contents in row 1</div>
<div class="main">Contents in test row</div>
<div id="4" class="maindiv">Contents in row 4</div>

To put it all together:
Succint: (May have some performance impact for large tables with many duplicate values)
$('tr').each(function(){
$("tr :contains('" + $('td', this).first().html() + "')").last()
.parent().css('color', 'red');
});
Explanation for the succint version:-
$('tr').each(function(){ // for each row of the table
$("tr // find a child inside a tr
:contains('" // that contains the text
+ $('td', this) // present within a td of the row (in line 1)
.first().html() // at the beginning
+ "')") // Using string concat to pass variable to `contains` selector)
.last() // at the end (last occurence of text)
.parent() // invoke `parent()` to select whole row
.css('color', 'red'); // apply css to identify the desired row.
});
Verbose: (Using Set of ECMAScript6 or $.unique() to remove duplicates from the full list of names. This way, when the forEach loop at the end of the code runs, it'll iterate only one per name.)
var uniqueNames = [];
$('tr').each(function(){
uniqueNames.push($('td', this).first().html());
}); // this will return the list of names from the table
// Remove duplicates from the list of names
uniqueNames = new Set(uniqueNames); // OR: uniqueNames = $.unique(uniqueNames);
uniqueNames.forEach(function(el){
$("tr :contains('" + el + "')").last().parent().css('color', 'red');
});

Highlight some rows of my table in javascript

I need to highlight some rows of my table. This highlight is based on the rows present in my response object. This object can be as follow:
<table id="ListRequests" class="table table-striped">
<tbody>
<tr id="13955">
<td>JEAN DUPONT</td>
<td>ACLIMEX SPRL</td>
</tr>
</tbody>
</table>
Here is my javascript code:
var id = $("tbody tr", response).attr('id');
var cols = $('#' + id + ' td');
cols.effect("highlight", {}, 30000);
This works fine only if my response object contains only 1 row. Now I need to be able to highlight more than 1 rows at a time. So for example with the response object below:
<table id="ListRequests" class="table table-striped">
<tbody>
<tr id="13955">
<td>JEAN DUPONT</td>
<td>ACLIMEX SPRL</td>
</tr>
<tr id="13954">
<td>MIKE GIVER</td>
<td>ARGO INTERNATIONAL CORP</td>
</tr>
</tbody>
</table>
Any idea how to adapt my javascript code for that purpose ?

If you really want to do it the way you are doing it, than you need to use each
var trs = $("tbody tr", response);
trs.each( function () {
var id = this.id,
cols = $('#' + id + ' td');
cols.effect("highlight", {}, 30000);
});
Better off returning a JSON object with ids to select.

attr returns a single value, regardless how many elements are matched by the proceeding selector.
If you want to map every selected element to an ID and return array, you need map:
var ids = $("tbody tr", response).map(function (i, e) { return $(e).attr('id'); });
Once you have your list of IDs, you can iterate over that list, and highlight the matching rows in the DOM:
ids.forEach(function (id) {
var cols = $('#' + id + ' td');
cols.effect("highlight", {}, 30000);
});

Here is a working snippet.
The idea is to scrap the ids from the response you get by looping the tr nodes, from these ids build a css selector for the nodes you are interested in, and finally highlight all them.
function highlight(response){
// retrieve the ids from the response
var ids = $(response).find("tbody tr").map(function(){
// `this` will be the trs one after the other.
// `map` will put all returned values in an array.
return this.getAttribute("id");
}).get();
// build the css selector
var selector = "#" + ids.join(",#");
// highlight the corresponding nodes
$(selector).effect("highlight", {}, 30000);
}
// Call highlight with your response example.
highlight('<table id="ListRequests" class="table table-striped"><tbody><tr id="13955"><td>JEAN DUPONT</td><td>ACLIMEX SPRL</td></tr><tr id="13954"><td>MIKE GIVER</td><td>ARGO INTERNATIONAL CORP</td></tr></tbody></table>');
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>
<table id="ListRequests" class="table table-striped">
<tbody>
<tr id="13955">
<td>JEAN DUPONT</td>
<td>ACLIMEX SPRL</td>
</tr>
<tr id="13954">
<td>MIKE GIVER</td>
<td>ARGO INTERNATIONAL CORP</td>
</tr>
<tr id="1211">
<td>OTHER ONE</td>
<td>MUSN'T BE HIGHLIGHTED</td>
</tr>
</tbody>
</table>

javascript - loop through a table and check the value

Background Information
I have two tables, one that is a list of available users, called "users" and the other one called "selected_users". When a row from the users table is clicked on, the app add / removes record from the selected_users table
<table id=users>
<tr class="odd" role="row" id="row_89"><td>89</td><td>John Doe</td><td>23819</td><td>mm2#yahoo.com</td></tr>
<tr class="even" role="row" id="row_90"><td>90</td><td>John Doe</td><td>23819</td><td>36338</td></tr>
<tr class="odd" role="row" id="row_91"><td>91</td><td>Jane Doe</td><td>23820</td><td>jane#yahoo.com</td></tr>
<tr class="even" role="row" id="row_92"><td>92</td><td>Jane Doe</td><td>23820</td><td>28519</td></tr>
<tr class="odd" role="row" id="row_93"><td>93</td><td>Jim Bob</td><td>23801</td><td>jbob#yahoo.com</td></tr>
</table>
<table id=selected_users class="table table-condensed table-bordered" width="80%">
<tr class="info"><td colspan="4"><b>Selected Users:</b></td></tr>
</table>
Question
I need to change the existing logic so that when a row in the available users list is selected, all other rows in the available users table that has a matching "pid" (which is the 3rd column) should be added to the selected_users table.
This is the code that is triggered when someone clicks on the available users table:
$('#users tbody').on('click', 'tr', function () {
var id = this.id;
var tr;
tr=$('<tr/>');
var index = $.inArray(id, selected);
if ( index === -1 ) {
selected.push( id ); //select/highlight in list of available users.
// Find td's inside this tr and add to selected_users table
var tds = $(this).find('td');
tr.append("<td>" + tds.eq(0).text() + "</td>");
tr.append("<td>" + tds.eq(1).text() + "</td>");
tr.append("<td>" + tds.eq(2).text() + "</td>");
tr.append("<td>" + tds.eq(3).text() + "</td>");
tr. attr('id', id.substring(4));
$('#selected_users').append(tr);
//loop through the avail users table and select all records with the same p number.
$("users td").each(function(i,o){
// new code goes here
}
} else {
selected.splice( index, 1 ); //deselect from list of avail users
//remove matching record from selected_users table.
var record_id = id.substring(4);
var rowtodelete = document.getElementById(record_id);
rowtodelete.parentNode.removeChild(rowtodelete);
}
$(this).toggleClass('selected');
} );
} );
What I have so far
I'm thinking of adding code like this (pseudo code) in the section with the comment "new code goes here"
//loop through the avail users table and select all records with the same pager number.
$("users tr").each(function(){
$(this).find('td ....
});
I'm not sure how to do a find to see if the third column matches what I have in tds.eq(2).text()
Any suggestions would be appreciated
EDIT 1
This is what I have so far:
//2015.06.11 - find and add all other rows with matching p number
var thisTR = $(this);
console.log(thisTR);
//select all siblings with same value in third column
thisTR.siblings().filter(function() {
console.log($('td',this).eq(2).text() );
//console.log($('td', thisTR).eq(2).text());
if ($('td',this).eq(2).text() == $('td', thisTR).eq(2).text() ) {
console.log("i found a match");
console.log("what is the row for: " + $('td',this).eq(2).text());
};
});
I just need a way identify the row where the matching td was found, and then do something similar to what I'm already doing to add a row to selected_users:
var tr;
tr = "";
... find the row and then...
tr.append("" + tds.eq(0).text() + "");
tr.append("" + tds.eq(1).text() + "");
tr.append("" + tds.eq(2).text() + "");
tr.append("" + tds.eq(3).text() + "");
tr. attr('id', id.substring(4));
$('#selected_users').append(tr);

Here is what you can use - .filter( function )
//save a reference of the current row
var thisTR = $(this);
//select all siblings with same value in third row
thisTR.siblings().filter(function() {
return $('td',this).eq(2).text() == $('td', thisTR).eq(2).text();
})
//Iterate through them and do what needs to be done.
.each(function() {
//do something
//here 'this' refers to tr (matched row)
//$('td', this) should give you all the tds in 'this' row
});

My suggestion is to add the user ID to the elements using a data- custom attribute so you can easily access them with a selector.
For example, notice the data-uid attribute below:
<tr class="odd" role="row" id="row_89" data-uid="23819"><td>89</td><td>John Doe</td><td>23819</td><td>mm2#yahoo.com</td></tr>
With that in place, grabbing all the relevant rows is easy:
rows = $('#users tr[data-uid=' + uid + ']');
// ...

Add a <tr> element to dynamic table, dynamically without a page refresh, php jquery

I am trying to add a dynamic row to the existing table on click of button, whose rows are dynamically created using output from PHP script.
I doing an ajax call to the script insert_tr.php which returns me a TR element in the same format as the existing table with the data.Data is returned appropriately
But unfortunately, the <tr> row is not being added to the table dynamically but adds only after a page refresh.
PHP file code :
<div id="v_div">
<table class="table table-bordered table-striped" >
<thead>
<th class='col-md-2'>name</th>
<th class='col-md-2'>number</th>
</thead>
<tbody>
<?php
while ($data = pg_fetch_assoc($ret)) {
echo
"<tr id=tr_".$data['sr_number'].">
<td class='td_topic' id=title:".$data['number']." >".trim($data['name'])."</td>
<td class='td_topic' id=title:".$data['number']." >".trim($data['number'])."</td>
<td class='td_topic' id=title:".$data['number']." ><button class='btn btn-info check1' type=button title='Add Entry'>Add Entry</button></td>
</tr>";
?>
</tbody>
</table>
</div>
Javascript :
$(document).ready(function() {
$("#v_div").on('click', '.check1', function() {
var field_userid = $(this).parent().attr("id");
var value = $(this).text();
$.post('insert_tr.php', field_userid + "=" + value, function(data) {
if (data != '') {
$(this).closest("tr").after(data);
}
});
});
});
All I want to do is add the row immediately after the current TR am on ,dynamically without a page refresh, which serves the ultimate use of an ajax call.

The reference to this is not the button that was clicked.
$(this).closest("tr").after(data);
Store a reference to the row outside the Ajax call.
$(document).ready(function() {
$("#v_div").on('click', '.check1', function() {
var field_userid = $(this).parent().attr("id");
var value = $(this).text();
var row = $(this).closest("tr");
$.post('insert_tr.php', field_userid + "=" + value, function(data) {
if (data != '') {
row.after(data);
}
});
});
});