Could anyone help me make a multiplication table, 0-10 in an 11x11 table?
I need to use createElement/appendchild. When I use document write, it almost look complete, just miss the placement of the blue columns/rows.
It should look something like this (Only need the numbers, no fancy outline):
This is what I've got so far:
for(var i = 0; i < 1; i++){
var tabell1 = document.createElement("table");
tabell.appendChild(tabell1);
//document.write("<table>");
for(var j = 0; j<11; j++){
var rad = document.createElement("tr");
tabell.appendChild("tr");
//document.write("<tr>");
for(var k = 1; k<=11; k++){
var kolonne = document.createElement("td");
tabell.appendChild(kolonne);
kolonne.innerHTML = k*(j+1);
//document.write("<td>"+ k*(j+1) +"</td>");
}
//document.write("</tr>");
}
//document.write("</table>")
}
<div id="tabell"></div>
You can generate the table using two loops.
You iterate twice from 0 to 10 included.
Use use the value 0 to represent your top row and first column, which hold the numbers to be multiplied. Since the iterator starts at 0, the value will be 0 and you can use that to detect when to add the header class and set the value to your non-zero iterator, either i or j:
const table = document.createElement('table');
for (let i = 0; i <= 10; i++){
const row = document.createElement('tr');
for (let j = 0; j <= 10; j++){
const col = document.createElement('td');
let val = i * j;
if (val === 0) {
val = i || j;
val = val ? val : '';
col.classList.add('header');
}
col.innerHTML = val;
row.appendChild(col);
}
table.appendChild(row);
}
document.body.appendChild(table);
table {
border-collapse: collapse;
}
td {
border: 1px solid black;
padding: 3px;
text-align: center;
}
.header {
background: #ccf;
}
The blue border can be obtained by css. See my code. I only changed four lines of loop
function createTables(maxNum,limit){
const table = document.createElement('table');
for(let i = 0;i<maxNum + 1;i++){
const row = document.createElement('tr');
for(let j = 0;j<limit + 1;j++){
const td = document.createElement('td');
//Below four lines are new
if(i === 0 && j === 0) td.innerHTML = '';
else if(i === 0) td.innerHTML = j;
else if(j === 0) td.innerHTML = i;
else td.innerHTML = i*j;
row.appendChild(td);
}
table.appendChild(row)
}
document.body.appendChild(table)
}
createTables(10,15);
table{
border-collapse:collapse;
}
td{
padding:20px;
font-size:25px;
background-color:gray;
border:2px solid black;
text-align:center;
vertical-align:center;
color:white;
}
tr > td:nth-child(1),tr:nth-child(1) > td{
background:blue;
}
I think best to use inserRow and insertCell
Cheers!
for (var i = 0; i < 1; i++) {
var tabell1 = document.createElement("table");
tabell.appendChild(tabell1);
for (var j = 0; j < 11; j++) {
var row = tabell1.insertRow(j);
for (var k = 0; k <= 10; k++) {
var cell = row.insertCell(k);
if (j == 0 && k == 0) {
//if first row and first column do nothing
} else if (j == 0) {
//else if first row
cell.innerHTML = k * (j + 1);
} else if (k == 0) {
//else if first column
cell.innerHTML = j;
} else {
//else multiply
cell.innerHTML = k * (j);
}
}
}
}
<div id="tabell"></div>
Related
I'm making a program that generates 2 tables. First has 16 images that represent a menu or options that you can click and then by clicking it you select in. The second table is generated by inputting rows and cells. So the second table is by default blank and each cells is meant to by replaced by an image that you selected in the first table. I've managed to do everything but I don't completley understand how to do the selecting and setting the image. (I assume it has something to do with ids and then onclick()?)
stolpci = window.prompt("vpiši stevilo stolpcov:");
for (i2 = 0; i2 < 1;) {
if (stolpci < 11 || stolpci > 41) {
stolpci = window.prompt("Napačno število. Število mora biti večje od 10 in manjše od 40. Ponovno vpiši stevilo stolpcov:");
} else {
i2++;
}
}
vrstice = window.prompt("vpiši stevilo vrstic:");
for (i2 = 0; i2 < 1;) {
if (vrstice < 6 || vrstice > 11) {
vrstice = window.prompt("Napačno število. Število mora biti večje od 5 in manjše od 11. Ponovno vpiši stevilo vrstic:");
} else {
i2++;
}
}
function generateTable() {
const tbl = document.createElement("table");
const tblBody = document.createElement("tbody");
for (let i = 0; i < vrstice; i++) {
const row = document.createElement("tr");
row.id = i;
for (let j = 0; j < stolpci; j++) {
const cell = document.createElement("td");
const cellText = document.createTextNode(' ');
cell.appendChild(cellText);
row.appendChild(cell);
cell.id = j;
}
tblBody.appendChild(row);
}
tbl.appendChild(tblBody);
document.body.appendChild(tbl);
}
function options() {
const tbl = document.createElement("table");
const tblBody = document.createElement("tbody");
let nImage = 1;
for (let i = 0; i < 1; i++) {
const row = document.createElement("tr");
for (let j = 0; j < 16; j++) {
const cell = document.createElement("td");
const cellText = document.createTextNode("");
if (nImage > 16) {
nImage = 1;
}
cell.style.backgroundImage = "url('images/sprite" + nImage + ".gif')";
cell.id = nImage;
nImage++;
cell.appendChild(cellText);
row.appendChild(cell);
}
tblBody.appendChild(row);
}
tbl.appendChild(tblBody);
document.body.appendChild(tbl);
}
window.onload = () => {
options();
generateTable();
}
table {
border: 1px solid gray;
padding: 0px;
margin: 0px;
border-spacing: 0px;
}
td {
margin: 0px;
padding: 0px;
min-width: 32px;
max-width: 32px;
max-height: 32px;
min-height: 32px;
width: 32px;
height: 32px;
border: 1px solid gray;
background-color: silver;
}
You would need to add click events to each cell. When click you could have another object which you save the 'selected' data to i.e the cell data. You would then need a button which when clicked would move your 'selected' data to the cells in the other table.
I'm trying to set each td as a different image that I have saved as imgn.gif. (n being image number, I have 13 images, img1.gif., img2.gif... img13.gif) I have a code that generates the table now I just can't figure out how to set a background image, preferably so that the n imgn.gif changes to the next index so the next td will have the next image.
this is the code that I have for now. I assume I have to set something differently here: const cellText = document.createTextNode(2);, so it sets background-image instead?
function options ()
{
const tbl = document.createElement("table");
const tblBody = document.createElement("tbody");
for (let i = 0; i < 1; i++) {
const row = document.createElement("tr");
for (let j = 0; j < 16; j++) {
const cell = document.createElement("td");
const cellText = document.createTextNode(2);
cell.appendChild(cellText);
row.appendChild(cell);
}
tblBody.appendChild(row);
}
tbl.appendChild(tblBody);
document.body.appendChild(tbl);
}
just add 5 lines in you actual code:
options();
function options() {
const tbl = document.createElement("table");
const tblBody = document.createElement("tbody");
const nbImage = 13;
let curImage = 1;
for (let i = 0; i < 1; i++) {
const row = document.createElement("tr");
for (let j = 0; j < 16; j++) {
const cell = document.createElement("td");
if (curImage > nbImage) {
curImage = 1;
}
cell.style.backgroundImage = 'url(img' + curImage + '.gif)';
const cellText = document.createTextNode(2);
cell.appendChild(cellText);
row.appendChild(cell);
curImage += 1;
}
tblBody.appendChild(row);
}
tbl.appendChild(tblBody);
document.body.appendChild(tbl);
}
I've added:
nbImage (13 from your post)
curImage to iterate through your 13 images
After your cell creation, checking the image number:
if (curImage > nbImage) {
curImage = 1;
}
So your fourteenth TD will have the image 1
Your is already created as a DOM element so you can refer it and add a background image:
cell.style.backgroundImage = 'url(img' + curImage + '.gif)';
That will add for each TD a backgound image "img1.gif", "img2.gif"... till "img13.gif", after "img1.gif" ... and so on...
You can create a variable (nImage for exemple) starting from 1 to 13 and reset it when up to 13 so it came back to 1. Then use this variable to modify style.backgroundImage of your td :
function options ()
{
const tbl = document.createElement("table");
const tblBody = document.createElement("tbody");
let nImage = 1 ;
for (let i = 0; i < 1; i++) {
const row = document.createElement("tr");
for (let j = 0; j < 16; j++) {
const cell = document.createElement("td");
const cellText = document.createTextNode(2);
if (nImage > 13){nImage =1 ;}
cell.style.backgroundImage = "url('yourPathTo/img"+nImage + ".gif')" ;
nImage++ ;
cell.appendChild(cellText);
row.appendChild(cell);
}
tblBody.appendChild(row);
}
tbl.appendChild(tblBody);
document.body.appendChild(tbl);
}
Please I am building a dynamic table and I want when j==3; two different buttons(add and reject buttons) should be added. I don't know the best way it will appear in JSON format. And when I looped, I got only one button on the table. Is there a possible way to do this better? I am new to javaScript.
**This is js **
var contributionTable = document.querySelector("#contributionTable");
if(myContribution.contributions.length>0){
var col = [];
for (var i = 0; i < myContribution.contributions.length; i++) {
for (var key in myContribution.contributions[i]) {
if (col.indexOf(key) === -1) {
col.push(key);
}
}
}
// CREATE TABLE HEAD .
var tHead = document.querySelector("#tableHead");
var hRow = document.querySelector("#tableRow");
tHead.appendChild(hRow);
contributionTable.appendChild(tHead);
var tBody = document.createElement("tbody");
for (var i = 0; i < myContribution.contributions.length; i++) {
var bRow = document.createElement("tr");
var td = document.createElement("td");
td.innerHTML = i+1;
bRow.appendChild(td);
for (var j = 0; j < 4; j++) {
var td = document.createElement("td");
if (j==3) {
for (let i = 0; i < myContribution.contributions.length; i++) {
let modify = myContribution.contributions[i].modify;
for(let j = 0; j < modify.length; j++){
if (td.textContent==="Accept") {
td.innerHTML='<div class="badge badge-success">'+modify[j]+'</div>';
bRow.appendChild(td);
}else
td.innerHTML='<div class="badge badge-danger">'+modify[j]+'</div>';
bRow.appendChild(td);
}
}
}else{
td.innerHTML = myContribution.contributions[i][col[j]];
bRow.appendChild(td);
}
}
tBody.appendChild(bRow)
}
contributionTable.appendChild(tBody);
}
with the above, I got only the reject button but I want both the add and reject buttons to appear on the same cell in each row.
This is my JSON data
var myContribution = {"contributions":
[
{
"txnNo":"00031",
"name": "Onyinye Okeke",
"Delete":"Delete",
"modify":["Accept","Reject"],
"date":"2020-01-19",
"amount":"100000",
"desc": "Weekly"
},
{
"txnNo":"00031",
"name": "Thompson Philip",
"Delete":"Delete",
"modify":["Accept","Reject"],
"date":"2019-11-09",
"amount":"70000",
"desc": "Daily"
}]}
Perhaps something like this?
var cellContent = '';
for(let j = 0; j < modify.length; j++) {
if (td.textContent==="Accept")
cellContent +='<div class="badge badge-success">'+modify[j]+'</div>';
else
cellContent +='<div class="badge badge-danger">'+modify[j]+'</div>';
}
td.innerHTML = cellContent;
bRow.appendChild(td);
If you want to add styles to the buttons, it is better to update button style using CSS
td > div.badge {
margin: 0 5px; /* no space on top, 5px right space, no bottom space, 5px left space
}
A function defined in setTimeOut only runs once in certain situations
I set up 3 inputs in ComboBox by which the user could set the grid size in the game. Selecting a value changes the rows and cols variables respectively, and then reboots the game by calling the init function.
The program starts normally, when I choose a different size the timer does not run the game more than once. When I change the size again it does work. If for example I change the sizes 6 times the game will only work in 3 of the times.
/* Game Of Life Application */
/* ------------------------ */
// initialize global variables
var rows = 55;
var cols = 140;
//initialize 2dim arrays
var arr;// current generation array
var nextArr; // next generation array
var mode = 0; //game current mode
var timeInMS = 40;
var timer;
//buttons selectors
var randomBtn = document.getElementById("randomBtnId");
var startBtn = document.getElementById("startBtnId");
var clearBtn = document.getElementById("clearBtnId");
var gridSize = document.getElementById("sizeId");
var container = document.getElementById("container");
function remove() {
let tb = document.querySelector("table");
tb.outerHTML = "";
}
gridSize.addEventListener("change",function(e) {
remove();
if (this.value === "Small") {
cols = 80;
rows = 20;
}
else if (this.value === "Medium") {
cols = 126;
rows = 34;
}
else {
cols = 140;
rows = 55;
}
timer = 0;
init();
});
//update the visual grid according to the states of the cell - live or dead.
function update() {
for (var i = 0; i < rows; i++) {
for (var j = 0; j < cols; j++) {
var cell = document.getElementById(i + "_" + j);
if (arr[i][j] === 0) {
cell.setAttribute("class", "dead");
} else {
cell.setAttribute("class", "live");
}
}
}
}
//copy generation 0 array to generation 1. current arr gets the values of next arr
function copyAndResetGrid() {
console.log("in the reset grid");
for (var i = 0; i < rows; i++) {
for (var j = 0; j < cols; j++) {
arr[i][j] = nextArr[i][j];
nextArr[i][j] = 0;
}
}
}
//count number of neighbors for every cell - inputs are r - rows , c - columns
function countNeighbors(r, c) {
let rstart = 0, cstart = 0, rend = rows - 1, cend = cols - 1;
let count = 0;
if (r - 1 > 0)
rstart = r - 1;
if (c - 1 > 0)
cstart = c - 1;
if (r + 1 <= rend)
rend = r + 1;
if (c + 1 <= cend)
cend = c + 1;
for (let i = rstart; i <= rend; i++) {
for (let j = cstart; j <= cend; j++) {
if (arr[i][j] === 1)
count++;
}
}
count -= arr[r][c];
if (count < 0)
count = 0;
// console.log("number of live neighbors at : " + r + "," + c + " is : " + count);
return count;
}
// calculate next 2dim array (generation 1) according to gameOfLife rules
function calculateNext() {
let numOfLivesArr = 0;
for (let i = 0; i < rows; i++) {
for (let j = 0; j < cols; j++) {
let currentMode = arr[i][j];
if (currentMode === 1)
numOfLivesArr++;
let count = countNeighbors(i, j);
if (currentMode === 0 && count === 3) {
nextArr[i][j] = 1;
}
else if (currentMode === 1 && (count < 2 || count > 3)) {
nextArr[i][j] = 0;
}
else {
nextArr[i][j] = currentMode;
}
}
}
// console.log("num of lives next: " + numOfLivesArr);
copyAndResetGrid();
//update();
}
//run game
function run() {
calculateNext();
update();
timer = setTimeout(run, 1000);
}
//populate the array with random values 0/1
function populateArr() {
for (let i = 0; i < rows; i++) {
for (let j = 0; j < cols; j++) {
arr[i][j] = Math.floor(Math.random() * 2);
if (arr[i][j] === 1) {
let cell = document.getElementById(i + "_" + j);
cell.setAttribute("class", "live");
}
else {
let cell = document.getElementById(i + "_" + j);
cell.setAttribute("class", "dead");
}
}
}
}
function deleteArr() {
}
//clear array - set 0 values for current and next generations arrays
function clear() {
for (let i = 0; i < rows; i++) {
for (let j = 0; j < cols; j++) {
arr[i][j] = 0;
nextArr[i][j] = 0;
}
}
//mode = 0;
}
function buttonsControl() {
randomBtn.addEventListener("click", function () {
clear();
populateArr();
});
startBtn.addEventListener("click", function () {
if (mode == 1) {
mode = 0;
startBtn.textContent = "Continue";
clearTimeout(timer);
}
else {
mode = 1;
startBtn.textContent = "Pause";
run();
}
});
clearBtn.addEventListener("click", function () {
startBtn.textContent = "Start";
clear();
update();
})
}
//draw table grid in the web page
function drawGrid() {
let grid = document.getElementById("container");
let table = document.createElement("table");
table.setAttribute("class", "center");
for (let i = 0; i < rows; i++) {
let tr = document.createElement("tr");
for (let j = 0; j < cols; j++) {
let cell = document.createElement("td");
cell.setAttribute("id", i + "_" + j);
cell.setAttribute("class", "dead");
tr.appendChild(cell);
cell.addEventListener("click", function () {
if (cell.classList.contains("live")) {
cell.setAttribute("class", "dead");
arr[i][j] = 0;
}
else
cell.setAttribute("class", "live");
arr[i][j] = 1;
});
}
table.appendChild(tr);
}
grid.appendChild(table);
}
//create 2 dim arrays - current and next generations.
function make2DArr() {
console.log("befire create arr !! ");
for (let i = 0; i < rows; i++) {
arr[i] = new Array(cols);
nextArr[i] = new Array(cols);
}
for (let i = 0; i < rows; i++) {
for (let j = 0; j < cols; j++) {
arr[i][j] = 0;
nextArr[i][j] = 0;
}
}
}
//initial game
function init() {
arr = new Array(rows);
nextArr = new Array(rows);
make2DArr();
drawGrid();
buttonsControl();
}
//load init function
window.onload = init();
body {
background-color: rgba(76, 77, 62, 0.514);
}
.center {
margin: auto;
width: 90%;
padding: 0.5rem;
position: relative;
}
#container {
margin: 0;
position: relative;
overflow: auto;
display: flex;
}
table {
border:1px rgb(241, 241, 241) solid;
border-spacing: 0;
position: absolute;
flex:1;
}
.live {
background-color:rgba(0, 0, 0, 0.685);
}
.dead {
background-color:rgba(228, 228, 241, 0.829);
}
td {
border:1px rgb(29, 182, 29) solid;
/* border-radius: 61px;*/
width: 10px;
height: 10px;
}
/* button {
margin-left: 0.5rem;
} */
button {
background-color: #4CAF50; /* Green */
border: none;
color: white;
padding: 1rem 2rem;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 0.5rem 0.5rem;
transition-duration: 0.4s;
cursor: pointer;
}
button:hover {
background-color: rgba(144, 180, 145, 0.596);
color: rgb(54, 59, 54)
}
<body>
<div class="center">
<div id="container">
</div>
<button id="startBtnId"><span>Start</span></button>
<button id="clearBtnId"><span>Clear</span></button>
<button id="randomBtnId"><span>Random</span></button>
<select id="sizeId">
<option value="Big">Big</option>
<option value="Medium">Medium</option>
<option value="Small">Small</option>
</select>
</div>
<script type="text/javascript" src="game.js"></script>
</body>
the timer is work only in even number of mode selection and does not work in odd number of mode selection.
for example , if i changed the mode 4 times : work -> not -> word -> not
Once an option has been selected from the list, init function was called. Within the function I called for 3 functions that build the arrays, initialize the board and create the button events listeners. The solution is to build the arrays and initialize the board without create the buttons event listeners again. so i just calld make2darray and drawgrid functions.
I am building a table and I want the background color of the selected cell to change. Then when i select a different cell (and apply the same change to this new cell), I want the change to revert in the first (no longer selected) cell. What is the best approach to this? Here is my code:
var table = '';
for (var r = 0; r < rows; r++) {
table += '<tr>';
for (var c = 0; c < cols; c++) {
if (c == 0) {
if (r == 0) {
var cellID = r.toString();
cellID += letterArray[c - 1];
table += '<td style="min-width:50px; height:25px;">' + '</td>';
}
else {
var cellID = r.toString();
cellID += letterArray[c - 1];
table += '<td style="min-width:50px; height:25px">' + r + '</td>';
}
}
else if (r == 0 && c > 0) {
var cellID = r.toString();
cellID += letterArray[c - 1];
table += '<td style="min-width:50px; height:25px">' + letterArray[c - 1] + '</td>';
}
else {
var cellID = r.toString();
cellID += letterArray[c - 1];
table += '<td id="' + cellID + '" style="min-width:50px; height:25px;" onclick="selectCell(this)">' + '</td>';
}
}
table += '</tr>';
}
Writing the table to the document:
document.write('<table id="table" border=1>' + table + '</table>');
selectCell function:
function selectCell(x) {
alert("Row = " + x.parentNode.rowIndex + " Col = " + String.fromCharCode((x.cellIndex - 1) + 65));
x.style.backgroundColor = 'purple';
}
This is where i encounter my problem. As I click the first cell, my alert shows me the info of which cell i have selected, and then changes the background color. Then when i select a different cell, it alerts me with the new cell row and column info, and changes the color.
What is the best way to revert the color change of the previously selected cell?
Thank you for your time and energy!
You should make a CSS class that applies the background color and add/remove it in your function. Your function can check for an element that already has the class, like this:
CSS:
.selected {
background-color: purple;
}
JS:
function selectCell(x) {
var currentSelection = document.querySelector('.selected');
if (currentSelection) {
currentSelection.classList.remove('selected');
}
x.classList.add('selected');
}
I agree with #Rishat Muhametshin that you should avoid using document.write. And I liked how #skyline3000 solved it so I put everything together into a snippet for you to see a cleaner way to code this.
I even went so far as to give you true headers on the top and the side and then added extra CSS to make them look more like headers.
var rows = 7;
var cols = 8;
var table = document.createElement('table');
var selecedTd;
table.id = "table";
table.border = 1;
table.cellSpacing = 0;
table.cellPadding = 4;
document.body.appendChild(table);
for (var r = 0; r < rows; r++) {
var tr = document.createElement('tr');
if (r > 0) {
tr.id = "row"+r;
}
table.appendChild(tr);
for (var c = 0; c < cols; c++) {
var cell;
var char = String.fromCharCode(c+64);
if (c===0 || r===0) {
cell = document.createElement('th');
cell.setAttribute('style', 'min-width:50px; height:25px;');
} else {
cell = document.createElement('td');
}
tr.appendChild(cell);
if (c == 0 && r > 0) {
cell.textContent = r;
}
else if (r == 0) {
if (c > 0) {
cell.textContent = char
cell.id = "col"+c;
}
}
else {
cell.id = r+char;
cell.addEventListener('click', selectCell);
//cell.textContent = cell.id;
}
}
}
function selectCell(event) {
var x = event.target;
var currentSelection = document.querySelector('.selected');
if (currentSelection) {
currentSelection.classList.remove('selected');
}
x.classList.add('selected');
}
.selected {
background-color: purple;
color: white;
}
th {
background-color: #DDD;
}
td {
cursor: pointer;
}
UPDATE
Below is code that will allow editing of the selected field. It needs work before it could be used in production and you would want to save the data in some array or object as well as in the cells, but it should get you going.
var rows = 7;
var cols = 8;
var table = document.createElement('table');
var selecedTd;
var inputField = document.createElement('input');
table.id = "table";
table.border = 1;
table.cellSpacing = 0;
table.cellPadding = 4;
document.body.appendChild(table);
inputField.className = "roving-input";
for (var r = 0; r < rows; r++) {
var tr = document.createElement('tr');
if (r > 0) {
tr.id = "row"+r;
}
table.appendChild(tr);
for (var c = 0; c < cols; c++) {
var cell;
var char = String.fromCharCode(c+64);
if (c===0 || r===0) {
cell = document.createElement('th');
} else {
cell = document.createElement('td');
}
tr.appendChild(cell);
if (c == 0 && r > 0) {
cell.textContent = r;
}
else if (r == 0) {
if (c > 0) {
cell.textContent = char
cell.id = "col"+c;
}
}
else {
cell.id = r+char;
cell.addEventListener('click', selectCell);
cell.textContent = cell.id;
}
}
}
function selectCell(event) {
var x = event.target;
var currentSelection = document.querySelector('.selected');
if (x !== currentSelection && x.localName === 'td') {
if (currentSelection) {
currentSelection.textContent = inputField.value;
currentSelection.classList.remove('selected');
}
x.classList.add('selected');
inputField.value = x.textContent;
x.appendChild(inputField);
inputField.style.width = (x.clientWidth-2)+'px';
inputField.focus();
inputField.select();
}
}
.selected {
position: relative;
}
th {
background-color: #DDD;
height:25px;
min-width:50px;
}
td {
cursor: pointer;
}
.roving-input {
background-color: #FDF;
border: none;
bottom: 0;
display: inline-block;
left: 0;
outline: none;
position:absolute;
right: 0;
top: 0;
}