Develop Reference

How do I hide a table row if there is a null value or a specific value

I'm not much of a javascript coder, but I'm trying to write something to make my work a little easier...
I have a table of data. The third cell of the table ('offersTable') is a display flag, which will either be 'Y', 'N', or empty. The source for the table is incomplete, which is why sometimes the cell is empty (null).
I'm trying to write a small script that will iterate down through the table, and then set the row to hide if the value if the cell is either 'N' or null. That way, only rows which have a 'Y' remain.
Please can someone help me? I'm going out of my mind trying to work this one out!
Sorry, I should have included my code...
<table id="offersTable">
<tr>
<th onclick="sortTable(0)">Lender</th>
<th onclick="sortTable(1)">Lender Code</th>
<th onclick="sortTable(2)">Display</th>
<th onclick="sortTable(3)">Loan Offered</th>
<th onclick="sortTable(4)">Term Offered</th>
<th onclick="sortTable(5)">Approval Probability</th>
<th onclick="sortTable(6)">APR</th>
<th onclick="sortTable(7)">Monthly Repayment</th>
<th onclick="sortTable(8)">Total Repayable</th>
</tr>
<tr id="lender1">
<td id="lender1Name"><script>document.getElementById("lender1Name").innerHTML = offers[0].lender_name;</script>
</td>
<td id="lender1Code"><script>document.getElementById("lender1Code").innerHTML = offers[0].lender_code;</script>
</td>
<td id="lender1Display"><script>document.getElementById("lender1Display").innerHTML = offers[0].display;</script>
</td>
<td id="lender1Value"><script>document.getElementById("lender1Value").innerHTML = offers[0].loan_offered;</script>
</td>
<td id="lender1Term"><script>document.getElementById("lender1Term").innerHTML = offers[0].term_offered;</script>
</td>
<td id="lender1AppProb"><script>document.getElementById("lender1AppProb").innerHTML = offers[0].approval_probability;</script>
</td>
<td id="lender1APR"><script>document.getElementById("lender1APR").innerHTML = offers[0].apr;</script>
</td>
<td id="lender1MonthlyRepay"><script>document.getElementById("lender1MonthlyRepay").innerHTML = offers[0].monthly_repayment;</script>
</td>
<td id="lender1TotalRepay"><script>document.getElementById("lender1TotalRepay").innerHTML = offers[0].total_repayment;</script>
</td>
</tr>
<tr id="lender2">
<td id="lender2Name"><script>document.getElementById("lender2Name").innerHTML = offers[1].lender_name;</script>
</td>
<td id="lender2Code"><script>document.getElementById("lender2Code").innerHTML = offers[1].lender_code;</script>
</td>
<td id="lender2Display"><script>document.getElementById("lender2Display").innerHTML = offers[1].display;</script>
</td>
<td id="lende2Value"><script>document.getElementById("lender2Value").innerHTML = offers[1].loan_offered;</script>
</td>
<td id="lender2Term"><script>document.getElementById("lender2Term").innerHTML = offers[1].term_offered;</script>
</td>
<td id="lender2AppProb"><script>document.getElementById("lender2AppProb").innerHTML = offers[1].approval_probability;</script>
</td>
<td id="lender2APR"><script>document.getElementById("lender2APR").innerHTML = offers[1].apr;</script>
</td>
<td id="lender2MonthlyRepay"><script>document.getElementById("lender2MonthlyRepay").innerHTML = offers[1].monthly_repayment;</script>
</td>
<td id="lender2TotalRepay"><script>document.getElementById("lender2TotalRepay").innerHTML = offers[1].total_repayment;</script>
</td>
</tr>
<tr id="lender3">
<td id="lender3Name"><script>document.getElementById("lender3Name").innerHTML = offers[2].lender_name;</script>
</td>
<td id="lender3Code"><script>document.getElementById("lender3Code").innerHTML = offers[2].lender_code;</script>
</td>
<td id="lender3Display"><script>document.getElementById("lender3Display").innerHTML = offers[2].display;</script>
</td>
<td id="lender3Value"><script>document.getElementById("lender3Value").innerHTML = offers[2].loan_offered;</script>
</td>
<td id="lender3Term"><script>document.getElementById("lender3Term").innerHTML = offers[2].term_offered;</script>
</td>
<td id="lender3AppProb"><script>document.getElementById("lender3AppProb").innerHTML = offers[2].approval_probability;</script>
</td>
<td id="lender3APR"><script>document.getElementById("lender3APR").innerHTML = offers[2].apr;</script>
</td>
<td id="lender3MonthlyRepay"><script>document.getElementById("lender3MonthlyRepay").innerHTML = offers[2].monthly_repayment;</script>
</td>
<td id="lender3TotalRepay"><script>document.getElementById("lender3TotalRepay").innerHTML = offers[2].total_repayment;</script>
</td>
</tr>
<tr id="lender4">
<td id="lender4Name"><script>document.getElementById("lender4Name").innerHTML = offers[3].lender_name;</script>
</td>
<td id="lender4Code"><script>document.getElementById("lender4Code").innerHTML = offers[3].lender_code;</script>
</td>
<td id="lender4Display"><script>document.getElementById("lender4Display").innerHTML = offers[3].display;</script>
</td>
<td id="lender4Value"><script>document.getElementById("lender4Value").innerHTML = offers[3].loan_offered;</script>
</td>
<td id="lender4Term"><script>document.getElementById("lender4Term").innerHTML = offers[3].term_offered;</script>
</td>
<td id="lender4AppProb"><script>document.getElementById("lender4AppProb").innerHTML = offers[3].approval_probability;</script>
</td>
<td id="lender4APR"><script>document.getElementById("lender4APR").innerHTML = offers[3].apr;</script>
</td>
<td id="lender4MonthlyRepay"><script>document.getElementById("lender4MonthlyRepay").innerHTML = offers[3].monthly_repayment;</script>
</td>
<td id="lender4TotalRepay"><script>document.getElementById("lender4TotalRepay").innerHTML = offers[3].total_repayment;</script>
</td>
</tr>
</table>

<table>
<tr>
<td>Header A</td>
<td>Header B</td>
<td>Filtered to</td>
</tr>
<tr>
<td>Info A 1</td>
<td>Info B 1</td>
<td>Y</td>
</tr>
<tr>
<td>Info A 2</td>
<td>Info B 2</td>
<td>N</td>
</tr>
<tr>
<td>Info A 3</td>
<td>Info B 3</td>
<td>N</td>
</tr>
<tr>
<td>Info A 4</td>
<td>Info B 4</td>
<td>Y</td>
</tr>
<tr>
<td>Info A 5</td>
<td>Info B 5</td>
<td>N</td>
</tr>
</table>
<table>
<tr>
<td>Header A</td>
<td>Header B</td>
<td>Filtered to</td>
</tr>
<tr>
<td>Info A 1</td>
<td>Info B 1</td>
<td>Y</td>
</tr>
<tr>
<td>Info A 2</td>
<td>Info B 2</td>
<td>N</td>
</tr>
<tr>
<td>Info A 3</td>
<td>Info B 3</td>
<td>Y</td>
</tr>
<tr>
<td>Info A 4</td>
<td>Info B 4</td>
<td>N</td>
</tr>
<tr>
<td>Info A 5</td>
<td>Info B 5</td>
<td>N</td>
</tr>
</table>
<script>
function filterTable(table, cellIndex, filter) {
for (var i = 1, tr; tr = table.rows[i]; i++) { // skip first line
var third_td = tr.cells[cellIndex];
tr.style.display = third_td.innerText === filter ? '' : 'none';
}
}
function filterAllTables(cellIndex, filter) {
var tables = document.getElementsByTagName('table');
if (tables.length > 0) {
for (var i = 0, table; table = tables[i]; i++) {
filterTable(table, cellIndex, filter);
}
}
}
window.addEventListener('load', function () {
filterAllTables(2, 'Y');
});
</script>

I would maybe try css: display: hidden; Also check out this website or research some before posting. https://salesforce.stackexchange.com/questions/122023/hide-html-table-rows-if-outputfield-is-null-or-0 Hope this helps!

without seeing your code is difficult but i know this solution with js:
for (i in document.querySelectorAll('td')) {
if (document.querySelectorAll('td')[i].textContent == 'N' || document.querySelectorAll('td')[i].textContent == 'null' ) {
document.querySelectorAll('td')[i].remove()
}
}
i'm using "remove" only to demonstrate it but you can use style.property...

I went with this option as it worked perfectly, operating in exactly the way that I wanted. Many thanks to René Datenschutz for the solution.
<table>
<tr>
<td>Header A</td>
<td>Header B</td>
<td>Filtered to</td>
</tr>
<tr>
<td>Info A 1</td>
<td>Info B 1</td>
<td>Y</td>
</tr>
<tr>
<td>Info A 2</td>
<td>Info B 2</td>
<td>N</td>
</tr>
<tr>
<td>Info A 3</td>
<td>Info B 3</td>
<td>N</td>
</tr>
<tr>
<td>Info A 4</td>
<td>Info B 4</td>
<td>Y</td>
</tr>
<tr>
<td>Info A 5</td>
<td>Info B 5</td>
<td>N</td>
</tr>
</table>
<table>
<tr>
<td>Header A</td>
<td>Header B</td>
<td>Filtered to</td>
</tr>
<tr>
<td>Info A 1</td>
<td>Info B 1</td>
<td>Y</td>
</tr>
<tr>
<td>Info A 2</td>
<td>Info B 2</td>
<td>N</td>
</tr>
<tr>
<td>Info A 3</td>
<td>Info B 3</td>
<td>Y</td>
</tr>
<tr>
<td>Info A 4</td>
<td>Info B 4</td>
<td>N</td>
</tr>
<tr>
<td>Info A 5</td>
<td>Info B 5</td>
<td>N</td>
</tr>
</table>
<script>
function filterTable(table, cellIndex, filter) {
for (var i = 1, tr; tr = table.rows[i]; i++) { // skip first line
var third_td = tr.cells[cellIndex];
tr.style.display = third_td.innerText === filter ? '' : 'none';
}
}
function filterAllTables(cellIndex, filter) {
var tables = document.getElementsByTagName('table');
if (tables.length > 0) {
for (var i = 0, table; table = tables[i]; i++) {
filterTable(table, cellIndex, filter);
}
}
}
window.addEventListener('load', function () {
filterAllTables(2, 'Y');
});
</script>

How to filter getElement based on CSS property in JS or jQuery

The following code gets all the tr tags in #mytable:
table = document.getElementById("myTable");
trs = table.getElementsByTagName("tr");
But if we want to get only tr tags whose display is not none, what should I do?
Thanks.

Not the best solution, but you can do this...
let tableRows = $("#my-table tr");
tableRows.map((i, obj)=>{
if($(obj).attr('style') != 'display: none;'){
// whatever you want to do here...
console.log(obj);
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.0/jquery.min.js"></script>
<table id="my-table">
<tbody>
<tr>
<td>data 1</td>
<td>data 2</td>
</tr>
<tr style="display: none;">
<td>data 3</td>
<td>data 4</td>
</tr>
<tr>
<td>data 5</td>
<td>data 6</td>
</tr>
<tr style="display: none;">
<td>data 7</td>
<td>data 8</td>
</tr>
<tr>
<td>data 9</td>
<td>data 10</td>
</tr>
</tbody>
</table>

You can use the :visible selector which is a jquery extension (https://api.jquery.com/visible-selector/) that allows seelction of elements based on display visibility.
In the following snippet - there are 3 tr's but the middle one is hidden with display:none. The console log targets the visible tr's and logs the number (2);
$(document).ready(function(){
const totalRows = $('#myTable tr');
const visibleRows = totalRows.filter(':visible');
console.log('total rows: '+ totalRows.length); // gives 3
console.log('visible rows: '+ visibleRows.length); // gives 2 - since one tr is hidden
})
.second-row {
display: none;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table id="myTable">
<tbody>
<tr class="first-row">
<td>row 1</td>
<td>row 1</td>
<td>row 1</td>
</tr>
<tr class="second-row">
<td>row 2</td>
<td>row 2</td>
<td>row 2</td>
</tr>
<tr class="third-row">
<td>row 3</td>
<td>row 3</td>
<td>row 3</td>
</tr>
</tbody>
</table>

Simple solution with VanillaJS
var elems = document.querySelectorAll('tr');
var noneElems = [];
elems.forEach(function (element) {
if (window.getComputedStyle(element).display == 'none') {
noneElems.push(element);
}
});
console.log( { noneElems } );
<table id="mytable">
<tr>
<td>Block</td>
<td>1</td>
</tr>
<tr style="display:none">
<td>None</td>
<td>1</td>
</tr>
<tr>
<td>Block</td>
<td>2</td>
</tr>
<tr style="display:none">
<td>None</td>
<td>2</td>
</tr>
</table>

Swapping td elements of table using javascript

Is there a simple way of swapping elements of an html table using javascript?
for instance having a table like this:
<table>
<tr>
<td class = "draggable">
<div class = "droppable">Item 1</div>
</td>
</tr>
<tr>
<td class = "draggable">
<div class = "droppable">Item 2</div>
</td>
</tr>
I want to make it available to swap cells.
Thanks!

I've written a little function to swap elements. Pass as arguments the parent (container of swapping elements), and two numbers (index) of the children elements that you want to be swapped.
var rowsParent = document.getElementById('sortRows');
var cellsParent = document.getElementById('sortCells');
swapElements(rowsParent,0,1);
swapElements(cellsParent,2,0);
function swapElements(parent,elemA,elemB){
//a little of validation
if(!parent||parent.constructor.toString().search('HTML')===-1) return;
var children = parent.children;
if(typeof elemA!=='number' || typeof elemB!=='number' || elemA===elemB || !children[elemA] || !children[elemB]) return;
elemB = elemA<elemB ? elemB--:elemB;
var childNumb = children.length - 1;
var a = parent.removeChild(children[elemA]);
var b = parent.removeChild(children[elemB]);
append(elemB,a);
append(elemA,b);
function append(a,b){
childNumb===a ? parent.appendChild(b) : parent.insertBefore(b,children[a]);
}
}
table, td {
border: solid 1px black;
padding: 3px;
margin: 15px;
}
<table>
<tbody id="sortRows">
<tr>
<td>a 1</td>
<td>a 2</td>
<td>a 3</td>
<td>a 4</td>
<td>a 5</td>
</tr>
<tr id="sortCells">
<td>b 1</td>
<td>b 2</td>
<td>b 3</td>
<td>b 4</td>
<td>b 5</td>
</tr>
<tr>
<td>c 1</td>
<td>c 2</td>
<td>c 3</td>
<td>c 4</td>
<td>c 5</td>
</tr>
<tr>
<td>d 1</td>
<td>d 2</td>
<td>d 3</td>
<td>d 4</td>
<td>d 5</td>
</tr>
<tr>
<td>e 1</td>
<td>e 2</td>
<td>e 3</td>
<td>e 4</td>
<td>e 5</td>
</tr>
</tbody>
</table>

You could do it in the same way you swap contents for any variable:
var child1_HTML = $("table tr:nth-child(1)").html();
$("table tr:nth-child(1)").html($("table tr:nth-child(2)").html());
$("table tr:nth-child(2)").html(child1_HTML);

Highlight cell border color when click, change back when click to others

I have the code below:
function highlight(cell){
cell.style.borderColor = "red";
}
function originalColor(cell){
cell.style.borderColor = "black";
}
td{
cursor: pointer;
}
<table border="1">
<tr>
<td onmousedown="highlight(this);" onblur="originalColor(this);">Cell 1</td>
<td onmousedown="highlight(this);" onblur="originalColor(this);">Cell 2</td>
<td onmousedown="highlight(this);" onblur="originalColor(this);">Cell 3</td>
</tr>
<tr>
<td onmousedown="highlight(this);" onblur="originalColor(this);">Cell 4</td>
<td onmousedown="highlight(this);" onblur="originalColor(this);">Cell 5</td>
<td onmousedown="highlight(this);" onblur="originalColor(this);">Cell 6</td>
</tr>
<tr>
<td onmousedown="highlight(this);" onblur="originalColor(this);">Cell 7</td>
<td onmousedown="highlight(this);" onblur="originalColor(this);">Cell 8</td>
<td onmousedown="highlight(this);" onblur="originalColor(this);">Cell 9</td>
</tr>
</table>
It will highlight the border to red when click, when click to the other cell, it suppose change back to black color, but it doesn't work, I try onmouseup, onmouseover, it doesn't work as what I want.
The technique I'hv tried is using tabindex, it works; but that can highlight one cell, if I try to select 2 cells at the same time, it doesn't work. Anyone can help?

var redNow = 1;
function highlight(cell) {
redNow == 1 ? redNow = 0 : redNow.style.borderColor = "black";
redNow = cell;
cell.style.borderColor = "red";
}
td {
cursor: pointer;
}
<table border="1">
<tr>
<td onmousedown="highlight(this);">Cell 1</td>
<td onmousedown="highlight(this);">Cell 2</td>
<td onmousedown="highlight(this);">Cell 3</td>
</tr>
<tr>
<td onmousedown="highlight(this);">Cell 4</td>
<td onmousedown="highlight(this);">Cell 5</td>
<td onmousedown="highlight(this);">Cell 6</td>
</tr>
<tr>
<td onmousedown="highlight(this);">Cell 7</td>
<td onmousedown="highlight(this);">Cell 8</td>
<td onmousedown="highlight(this);">Cell 9</td>
</tr>
</table>

After your clarifying comment, if I understand correctly, you want to highlight a cell when you click it, and remove the highlighting if you choose to by clicking another element. If not, please clarify again. If that's indeed the case though, then the following code will work by traversing up the DOM to the parent table, then iterating through all the cells and taking appropriate action:
function toggleBorderColor(c) {
cells = c.parentElement.parentElement.getElementsByTagName('td');
for (var i in cells) {
var cell = cells.item(i);
cell.style.borderColor = (cell != c) ? "" : "red";
}
}
td {
cursor: pointer;
}
<table border="1">
<tr>
<td onmousedown="toggleBorderColor(this);">Cell 1</td>
<td onmousedown="toggleBorderColor(this);">Cell 2</td>
<td onmousedown="toggleBorderColor(this);">Cell 3</td>
</tr>
<tr>
<td onmousedown="toggleBorderColor(this);">Cell 4</td>
<td onmousedown="toggleBorderColor(this);">Cell 5</td>
<td onmousedown="toggleBorderColor(this);">Cell 6</td>
</tr>
<tr>
<td onmousedown="toggleBorderColor(this);">Cell 7</td>
<td onmousedown="toggleBorderColor(this);">Cell 8</td>
<td onmousedown="toggleBorderColor(this);">Cell 9</td>
</tr>
</table>

How can remove next cell in table using JavaScript?

I have the code below:
function colspan(){
var x = document.getElementById("Cell2");
x.setAttribute("colspan", 2);
x.next().remove();
}
<table border="1">
<tr>
<td id="Cell1">Cell 1</td>
<td id="Cell2">Cell 2</td>
<td id="Cell3">Cell 3</td>
</tr>
<tr>
<td id="Cell4">Cell 4</td>
<td id="Cell5">Cell 5</td>
<td id="Cell6">Cell 6</td>
</tr>
<tr>
<td id="Cell7">Cell 7</td>
<td id="Cell8">Cell 8</td>
<td id="Cell9">Cell 9</td>
</tr>
</table>
<input type="button" onclick="colspan();" value="Change"/>
I would like to delete the next cell of the current cell I have called. When the Cell 2 is colspan, the Cell 3 should be removed, but I use .next().remove() is not working. Anyone can help?

This is something you could do.
function colspan() {
var ele = document.getElementById("Cell2");
ele.setAttribute("colspan", 2);
if (ele.nextElementSibling) {
ele.nextElementSibling.remove();
}
}
<table border="1">
<tr>
<td id="Cell1">Cell 1</td>
<td id="Cell2">Cell 2</td>
<td id="Cell3">Cell 3</td>
</tr>
<tr>
<td id="Cell4">Cell 4</td>
<td id="Cell5">Cell 5</td>
<td id="Cell6">Cell 6</td>
</tr>
<tr>
<td id="Cell7">Cell 7</td>
<td id="Cell8">Cell 8</td>
<td id="Cell9">Cell 9</td>
</tr>
</table>
<input type="button" onclick="colspan();" value="Change" />

I think you are mixing jQuery and pure JS..
You should use nextSibling() & removeChild(element) on parent.
have a look here: Remove element by id

The last remove() function was on jquery function. so use jquery library link and call the id with jquery type.
function colspan(){
var x = document.getElementById("Cell2");
x.setAttribute("colspan", 2);
$('#Cell2').next().remove();
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table border="1">
<tr>
<td id="Cell1">Cell 1</td>
<td id="Cell2">Cell 2</td>
<td id="Cell3">Cell 3</td>
</tr>
<tr>
<td id="Cell4">Cell 4</td>
<td id="Cell5">Cell 5</td>
<td id="Cell6">Cell 6</td>
</tr>
<tr>
<td id="Cell7">Cell 7</td>
<td id="Cell8">Cell 8</td>
<td id="Cell9">Cell 9</td>
</tr>
</table>
<input type="button" onclick="colspan();" value="Change"/>