HTML - how to insert rows in a prepend manner? - javascript

I'm trying to add a new set of rows below the original one's and have a delete function together w/ the add function. Luckily I bumped into an article of w3schools : http://www.w3schools.com/jsref/met_table_insertrow.asp
However it adds the new cells above the original one's, how can I tweak it to make it work?
CODE:
<table id="myTable" border="1">
<tr>
<td>Row1 cell1</td>
<td>Row1 cell2</td>
</tr>
<tr>
<td>Row2 cell1</td>
<td>Row2 cell2</td>
</tr>
<tr>
<td>Row3 cell1</td>
<td>Row3 cell2</td>
</tr>
</table><br>
<button onclick="myCreateFunction()">Create row</button>
<button onclick="myDeleteFunction()">Delete row</button>
<script>
function myCreateFunction()
{
var table = document.getElementById("myTable");
{
var row = table.insertRow(0);
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
cell1.innerHTML = "NEW CELL1";
cell2.innerHTML = "NEW CELL2";
}
}
function myDeleteFunction()
{
document.getElementById("myTable").deleteRow(0);
}
</script>

insertRow() takes the position of the new row as an (optional) parameter. So, if you want the new row at the end of the table, insert an according index like this:
var row = table.insertRow( table.rows.length );
Example Fiddle
In your code you set an index of 0, which by definition is the first row.

Here's the jQuery solution.... if you want it.
HTML
<table border="1" id="myTable">
<thead>
<tr>
<td>Col 1</td>
<td>Col 2</td>
</tr>
</thead>
<tbody>
</tbody>
</table>
<br>
<input type="button" onclick="addRow()" value="Add row" />
JavaScript
var rowNo = 1;
function addRow()
{
$('#myTable tbody').append('<tr><td>Row #'+ rowNo +'</td>'+
'<td>Row #'+ rowNo +'</td></tr>');
rowNo++;
}
Live Demo

If you are using jQuery then use .after() with :eq(int) and for removing you can use .remove() but if you want to remove only newly added rows then you can use :gt(int) method:
$(function () {
$('#create').on('click', function () {
var table = $('#myTable')[0];
var rows = table.rows.length;
var row = '<tr><td>'+ rows +'</td><td>'+ rows +'</td></tr>';
$('#myTable').find('tr:eq(2)').after(row);
});
$('#delete').on('click', function () {
$('#myTable').find('tr:gt(2)').get(0).remove();
});
});
Using the above script you have to give your buttons specific ids #create for row creation and #delete for delete button like suggested below.
<button id='create'>Create row</button>
<button id='delete'>Delete row</button>
Note:
Unobtrusive javascript is better. Inline scripting should be avoided.
Demo fiddle
Updates:
Instead of hardCode in :eq(2) and :gt(2) we can cache the length of the trs in table:
$(function () {
var o = $('#myTable').find('tr:last').index(); // cache it here
$('#create').on('click', function () {
var table = $('#myTable')[0];
var rows = table.rows.length;
var row = '<tr><td>' + rows + '</td><td>' + rows + '</td></tr>';
$('#myTable').find('tr:eq(' + o + ')').after(row); // place it here
});
$('#delete').on('click', function () {
$('#myTable').find('tr:gt(' + o + ')').get(0).remove(); // and here
});
});
Demo fiddle with cached trs
$('#myTable').find('tr:last').index(); this line gets the last tr's index at the dom ready which is in this case 2 because .index() is 0 based.

var row = table.insertRow(0); // 0 represent the 0th index and hence it add at top
change it to
var tdsLength = table.getElementsByTagName('tr').length;
var row = table.insertRow(tdsLength); //change it to last index
or
var row = table.insertRow(-1);
From Docs, If index is -1 or equal to the number of rows, the row is appended as the last row.
JSFiddle

Change the code in:
var row = table.insertRow(0);
to:
var row = table.insertRow(-1);

Maybe use jQuery .prepend() function? Check it here: http://api.jquery.com/prepend/

Related

How to dynamically remove a table row [duplicate]

This question already has answers here:
Click event doesn't work on dynamically generated elements [duplicate]
(20 answers)
Closed 2 years ago.
I have a html table like so -
<table class="table" id="myTable">
<thead>
<th>Email</th>
<th>Delete</th>
</thead>
<tbody>
</tbody>
I can dynamically add to the table doing this:
var tbody = $('#myTable').children('tbody');
var table = tbody.length ? tbody : $('#myTable');
table.append("<tr><td>"+user_email+"</td><td><input type='button' value='Del' id ='"+user_id+"'class='btn btn-danger btn-sm'></td></tr>");
But when I try to remove a row doing this:
$('input[type="button"]').click(function(e){
$(this).closest('tr').remove()
})
The row don't remove. How do I resolve this?
You were pretty close, since the TR and the button are dynamically generated,
use the .on() method:
$("#myTable").on("click", "input[type='button']", function(e){
$(this).closest('tr').remove()
});
Sometimes not using jQuery may help you understand what's actually happening. Here's a snippet that may be helpful.
// add the listener to the document (event delegation)
document.addEventListener("click", deleteRow);
// add a first row
addRow(document.querySelector("#myTable"));
function deleteRow(evt) {
// read data-property (data-delete or data-add)
if (evt.target.dataset.delete) {
// retrieve the row to delete
const row2Delete = evt.target.closest("tr");
// remove that from *its parent* (the table)
row2Delete.parentNode.removeChild(row2Delete);
} else if (evt.target.dataset.add) {
addRow(document.querySelector("#myTable"));
}
return true;
}
function addRow(toTable) {
// create a row
const row = document.createElement("tr");
// create 2 cells
const cell1 = document.createElement("td");
const cell2 = cell1.cloneNode(true);
//create a button for the second cell
const bttn = document.createElement("button");
bttn.dataset.delete = "1";
bttn.textContent = "delete";
// fill the first cell with a random e-mailaddress
cell1.appendChild(document.createTextNode(`someUser${
Math.floor(1 + Math.random() * 10000000)}#somewhere.net`));
// append button to cell2
cell2.appendChild(bttn);
// append cells to row
row.appendChild(cell1);
row.appendChild(cell2);
// append row to table
toTable.appendChild(row);
}
<button data-add="1">Add a row</button>
<table class="table" id="myTable">
<thead>
<th>Email</th>
<th>Delete</th>
</thead>
<tbody>
</tbody>

removeChild() Function should only remove appendChild() Function Entries in Javascript

I Created a HTML Table and Created 1 Row in it... I created two functions first to Clone and the Row and second to Remove the Row..
using appendchild and removechild function
But removeChild Function Deletes the Main Row as well...
I want the removeChild Function to be only able to remove cloned Rows, Not the original row...
Note: in Clone of Row, I have replaced the ID with " ". to remove duplicate id.
i Tried to do this by creating a if statement which check if the id of row is same as original row only then remove the row. but I think I am not doing it in right way.. Below is code..
<table id="table-logic">
<tbody id="qualiBody">
<tr>
<td>column 1</td>
<td>column 2</td>
<td>column 3</td>
<td>column 4</td>
</tr>
</tbody>
</table>
<a onclick="cloneRow()">Add Row</a><br>
<a onclick="removeRow()">Remove Row</a>
//clone Row with changed id
function cloneRow() {
var row = document.getElementById('addr00'); // find row to copy
var table = document.getElementById("qualiBody"); // find table body to append to
var clone = row.cloneNode(true); // copy children too
clone.id = ' '; // change id to a blank space
table.appendChild(clone) // add new row to end of table
}
//Remove Row
function removeRow() {
var table = document.getElementById("qualiBody"); // find table to append to
var mainRow = document.getElementById("qualiBody")
if (mainRow.childNodes.id != 'addr00') {
table.removeChild(qualiBody.lastChild);
}
}
I expect to make my removeRow Function only remove cloned Rows... Not the Original Row...
I think the if statement can work in that part by Just making javascript check the id of element... if id of row != id of original row .. remove last child.
//clone Row with changed id
function cloneRow() {
var row = document.getElementById('addr00'); // find row to copy
var table = document.getElementById("qualiBody"); // find table body to append to
var clone = row.cloneNode(true); // copy children too
clone.classList.add("cloned");
table.appendChild(clone) // add new row to end of table
}
//Remove Row
function removeRow()
{
var table = document.getElementById("qualiBody");
let last = table.lastElementChild;
if (last.classList.contains("cloned"))
{
last.remove();
}
}
<table id="table-logic">
<tbody id="qualiBody">
<tr id="addr00"><td>column 1</td><td>column 2</td><td>column 3</td><td>column 4</td></tr>
<tr class="cloned"><td>column 1</td><td>column 2</td><td>column 3</td><td>column 4</td></tr>
<tr class="cloned"><td>column 1</td><td>column 2</td><td>column 3</td><td>column 4</td></tr>
<tr class="cloned"><td>column 1</td><td>column 2</td><td>column 3</td><td>column 4</td></tr>
</tbody>
</table>
<a onclick="cloneRow()">Add Row</a><br>
<a onclick="removeRow()">Remove Row</a>

Delete all rows in an HTML table except for header with JS

So I am having trouble deleting all of the data in an HTML table with js WITHOUT deleting the header. Here is my HTML:
<html>
<title>Z80 Opcodes</title>
<body>
<input type="text" id = "input" value = "">
<button onClick = "hex()">Hex</button>
<button onClick = "bin()">Bin</button>
<button onClick = "assem()">Assembly</button>
<button onClick = "find()">Find</button>
<table id = "out" style="width:100%">
<thead>
<th align="left">Binary</th>
<th align="left">Hex</th>
<th align="left">Assembly</th>
<th align="left">Description</th>
</thead>
<tbody id="tb">
</tbody>
<script src = "js/script.js">
</script>
</body>
</html>
And here is script.js:
var id = document.getElementById("out");
var ab = "";
var row;
var table = ['0000000000nopno operation', '0000000101ld (bc), **loads ** into BC'];
var bin = ['00000000', '00000001'];
var hex = ['00', '01'];
var assembly = ['nop', 'ld (bc), **'];
var description = ['no operation', 'loads ** into BC'];
l = table.length;
function find() {
row = id.insertRow(0);
for (i=0;i <=l-1;i++) {
ab = table[i];
if (ab.includes(document.getElementById("input").value)) {
row = id.insertRow(-1);
cell1 = row.insertCell(0);
cell2 = row.insertCell(1);
cell3 = row.insertCell(2);
cell4 = row.insertCell(3);
cell1.innerHTML = bin[i];
cell2.innerHTML = hex[i];
cell3.innerHTML = assembly[i];
cell4.innerHTML = description[i];
}
}
}
I have omitted A LOT of array entries because they contained almost the FULL instruction set of thee z80 microprocessor.
What this code does (basically) is it gets an input from the user and if the array table contains that input then it gets the corresponding values from bin, hex, assembly and description and assigns each a column in the table out, then adds a row with the for the data. However, I cannot seem to find a way to delete all of the rows in tbody before another set of values are appended to the table without deleting thead. I have searched around on the web and found several solutions, none of which worked. They either deleted the thead or caused some kind of error (I'll give examples if you ask). I am using Google Chrome version 63.0.3239.132 web browser to run my code.
As you may be able to see I am quite new to js and HTML
Any ideas what I have done wrong?
~Jachdich
First You have to close your <table> tag </table>
This is how you can clear your table.
$('#remove').on('click', ()=>{
$('#tb').empty()
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table id = "out" style="width:100%">
<thead>
<th align="left">Binary</th>
<th align="left">Hex</th>
<th align="left">Assembly</th>
<th align="left">Description</th>
</thead>
<tbody id="tb">
<tr>
<th>01010101</th>
<th>1231:sdf:sdf42</th>
<th>213123</th>
<th>description</th>
</tr>
</tbody>
</table>
<button id="remove">
clear
</button>
Assuming you want to keep the tbody element intact instead of just removing it and all its children at once:
// get a reference to the tbody element
var tb = document.querySelector('#out tbody');
// while tb has children, remove the first one
while (tb.childNodes.length) {
tb.removeChild(tb.childNodes[0]);
}
// tb is now empty
From a semantic perspective, it would make the removal of rows much easier if you added them to the <tbody> element instead of the <thead> element. This way, you could target the rows within the body and remove them whilst preserving your <thead> (sibling node to ):
var body = document.querySelector('tbody');
while (body.firstChild) {
// This will remove all children within tbody which in your case are <tr> elements
body.removeChild(body.firstChild);
}
body.removeChild(rowsWithinBody)
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/tbody#examples
with jQuery you can do it simply in a single line of code.
$("#table_id tbody tr").remove();
it will remove all rows in a table except the header.

How to filter dynamic HTML table using javascript

I am appending rows to the table whenever a event is occurring.But when I am trying to filter the table, I am only able to filter the static data in the table. How can I also filter the appended rows. Please help me with this.
//Filter rows
var $rows = $('#table tr');
$('#search').keyup(function() {
var val = '^(?=.*\\b' + $.trim($(this).val()).split(/\s+/).join('\\b)(?=.*\\b') + ').*$',
reg = RegExp(val, 'i'),
text;
$rows.show().filter(function() {
text = $(this).text().replace(/\s+/g, ' ');
return !reg.test(text);
}).hide();
});
The variable rows is initialised with the rows in the DOM at the moment you tell jQuery to get those elements. No matter how many rows you add or remove, the rows variable will always have the same set of element. The quickest solution is to move your variable declaration inside the keyup handler like this:
$('#search').keyup(function() {
var $rows = $('#table tr');
var val = '^(?=.*\\b' + $.trim($(this).val()).split(/\s+/).join('\\b)(?=.*\\b') + ').*$',
reg = RegExp(val, 'i'),
text;
$rows.show().filter(function() {
text = $(this).text().replace(/\s+/g, ' ');
return !reg.test(text);
}).hide();
});
Another solution would the use getElementsByTagName, this returns a live HTMLCollection. In other words, changes in the DOM are reflected in your variable as they occur. The snippet below will log the number of rows in the table without re-querying the DOM.
const
tableTwo = document.getElementById('table2'),
// Get a live HTMLCollection with the rows in table 2.
tableTwoRows = tableTwo.getElementsByTagName('tr');
// Log the number of rows in table 2.
console.log(`Number of rows in table 2 before insert: ${tableTwoRows.length}`);
const
cell = document.createElement('td'),
row = document.createElement('tr'),
body = tableTwo.querySelector('tbody');
// Create a third row to add to the table.
cell.textContent = 'table 2, row 3';
row.appendChild(cell);
body.appendChild(row);
// Log the number of rows in table 2, this should report a number than the last
// log eventhough we didn't update the content of the tableTwoRows variable manually.
console.log(`Number of rows in table 2 after insert: ${tableTwoRows.length}`);
<table id="table1">
<tbody>
<tr>
<td>table 1, row 1</td>
</tr>
</tbody>
</table>
<table id="table2">
<tbody>
<tr>
<td>table 2, row 1</td>
</tr>
<tr>
<td>table 2, row 2</td>
</tr>
</tbody>
</table>

Split Table into Individual Tables with One Row with Javascript

I would like to split this entire table into three sub tables using Javascript. Each table should retain it's header information.
I cannot adjust the id's or classes as they are generated by a web application, so I need to make do with what is available.
I've been trying to crack this with Jfiddle for quite awhile and am getting frustrated. I'm pretty new to Javascript, but can't image this would require a lot of code. If anyone knows how to split this apart by row size as well (i.e. Split Table up, but selectively), that would be appreciated as well.
I'm limited to Javascript and Jquery 1.7.
<div id="serviceArray">
<table border="1" class="array vertical-array">
<thead>
<tr>
<th>#</th>
<th>Savings</th>
<th>Expenses</th>
<th>Savings</th>
<th>Expenses</th>
<th>Savings</th>
<th>Expenses</th>
</tr>
</thead>
<tbody>
<tr>
<td>Sum</td>
<td>$180</td>
<td>$500</td>
<td>$300</td>
<td>$700</td>
<td>$600</td>
<td>$1000</td>
</tr>
<tr>
<td>Home</td>
<td>$100</td>
<td>$200</td>
<td>$200</td>
<td>$300</td>
<td>$400</td>
<td>$500</td>
</tr>
<tr>
<td>Work</td>
<td>$80</td>
<td>$300</td>
<td>$100</td>
<td>$400</td>
<td>$200</td>
<td>$500</td>
</tr>
</tbody>
</table>
</div>
Did you mean like this?
var tables = $('#serviceArray table tbody tr').map(function () { //For each row
var $els = $(this).closest('tbody') //go to its parent tbody
.siblings('thead').add( //fetch thead
$(this) //and add itself (tr)
.wrap($('<tbody/>')) //wrapping itself in tbody
.closest('tbody')); //get itself with its tbody wrapper
return $els.clone() //clone the above created steps , i.e thead and tbody with one tr
.wrapAll($('<table/>', { //wrap them all to a new table with
'border': '1', //attributes.
'class': 'array vertical-array'
})
).closest('table'); //get the new table
}).get();
$('#serviceArray table').remove();
$('body').append(tables); //append all to the table.
Demo
Or just simply clone the table and remove all other trs from tbody except this one and add it to DOM (Much Shorter Solution).
var tables = $('#serviceArray table tbody tr').map(function (idx) {
var $table = $(this).closest('table').clone().find('tbody tr:not(:eq(' + idx + '))').remove().end();
return $table;
}).get();
Demo
Each of the methods used has documentation available in web and you can use this to work out something yourself to what you need.
You can use simple Javascript for table creation and it will generate rows according to your returned response from api.
var tableHeader = this.responseJsonData.Table_Headers;
var tableData = this.responseJsonData.Table_Data;
let table = document.querySelector("table");
function generateTableHead(table, data) {
//alert("In Table Head");
let thead = table.createTHead();
let row = thead.insertRow();
for (let key of data) {
let th = document.createElement("th");
let text = document.createTextNode(key);
th.appendChild(text);
row.appendChild(th);
}
}
function generateTable(table, data) {
// alert("In Generate Head");
for (let element of data) {
let row = table.insertRow();
for (key in element) {
let cell = row.insertCell();
let text = document.createTextNode(element[key]);
cell.appendChild(text);
}
}
}

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