I have a page which prompts the user to enter a positive integer from 1 to 9, then the javascript code will generate a multiplication table from the input value all the way to 9. I am getting an error in which I cannot retrieve the value and do a multiplication with it.
function timesTable()
{
var values = document.getElementById('value1');
var showTables = '';
for (var i=1; i<9; i++) {
showTables += values + " x " + i +" = "+ values*i + "\n";
}
var p_tables = document.getElementById('tables').innerHTML = showTables;
}
<label>Enter an integer from 1 to 9 : </label>
<input type="text" size=20 id=value1 name="value">
<button onclick="timesTable()">Generate times table</button><br> <br>
<p id="tables"></p>
Expected result:
You have to take the value of the element not the element itself
var values = document.getElementById('value1').value;
function timesTable()
{
var values = document.getElementById('value1').value;
var showTables = '';
for (var i=1; i<9; i++) {
showTables += values + " x " + i +" = "+ values*i + "<br>";
}
var p_tables = document.getElementById('tables').innerHTML = showTables;
}
<label>Enter an integer from 1 to 9 : </label>
<input type="text" size=20 id=value1 name="value">
<button onclick="timesTable()">Generate times table</button><br> <br>
<p id="tables"></p>
You are trying to multiply the element itself. What you actually want is the value.
function timesTable()
{
var values = document.getElementById('value1').value;
var showTables = '';
for (var i=1; i<9; i++) {
showTables += values + " x " + i +" = "+ values*i + "\n";
}
var p_tables = document.getElementById('tables').innerHTML = showTables;
}
<label>Enter an integer from 1 to 9 : </label>
<input type="text" size=20 id=value1 name="value">
<button onclick="timesTable()">Generate times table</button><br> <br>
<p id="tables"></p>
the javascript line in which you are trying to find value, is wrong as it will return the whole DOM and it's attributes and property.
You just have to find it's value, replace you line
var values = document.getElementById('value1');
with
var values = document.getElementById('value1').value;
This does what you want.
Note that if the user enters something unexpected, it may still fail. You can use an input of type="number" to require an integer (at least in some browsers.)
const userValue = document.getElementById("value1").value;
const p_tables = document.getElementById("tables");
let outputHtml = "";
for(let i = 1; i < 10; i++){
outputHtml += userValue + " x " + i + " = " + userValue * i + "<br/>";
}
p_tables.innerHTML = outputHtml;
you are using input field as text for table generation its better to use Number as input type and to get the value of input field you have to use value function as used in above code and for line break use
<\br>(please ignore '\').
function timesTable()
{
var values = document.getElementById('value1').value;
var showTables = '';
for (var i=1; i<=9; i++) {
showTables += values + " x " + i +" = "+ values*i + "<br>";
}
document.getElementById('tables').innerHTML = showTables;
}
<label>Enter an integer from 1 to 9 : </label>
<input type="Number" size=20 id=value1 name="value">
<button onclick="timesTable()">Generate times table</button><br> <br>
<p id="tables"></p>
Related
Prints '2 x 10 = 20' but not the whole table when the input is 2. I tried various means. But the result is same.
No error. Just like to print the whole multiplication table.
function loop() {
var i = 1;
var x = document.getElementById("num").value;
//document.getElementById("result").value = result;
while (i <= 10) {
document.getElementById("result").value = x + " x " + i + " = " + i * x;
i++;
}
}
<h1>While loop: </h1>
<p>The while loop keeps repeating an action until an associated condition returns false.</p>
<img src="images/loop.jpg" /><br/>
<img src="images/loop2.jpg" /><br/>
<body>
<p>JavaScripts Runs:</p>
<script src="while_1loop.js">
</script><br/> What number table would you like to have?<input type="number" name="" id="num" /><br>
<button type="button" onclick="loop()" ;>Start</button><br>
<textarea rows="12" cols="15" id="result" readonly>
</textarea><br/>
You are always changing the value of 'result' rather than adding to it:
function loop() {
var i = 1;
var x = document.getElementById("num").value;
//document.getElementById("result").value = result;
while (i <= 10) {
var result = document.getElementById("result");
var sum = document.createTextNode(x + " x " + i + " = " + i * x + "\n");
result.appendChild(sum);
i++;
}
}
<h1>While loop: </h1>
<p>The while loop keeps repeating an action until an associated condition returns false.</p>
<img src="images/loop.jpg" /><br/>
<img src="images/loop2.jpg" /><br/>
<body>
<p>JavaScripts Runs:</p>
<script src="while_1loop.js">
</script><br/> What number table would you like to have?<input type="number" name="" id="num" /><br>
<button type="button" onclick="loop()" ;>Start</button><br>
<textarea rows="12" cols="15" id="result" readonly>
</textarea><br/>
If I understand what you mean,
You rewrite whole textarea with this code:
document.getElementById("result").value = x + " x " + i + " = " + i * x;
but you need add new result after older results. Something like this:
var oldValue = document.getElementById("result").value;
var result = x + " x " + i + " = " + i * x;
document.getElementById("result").value = oldValue + '\n' + result;
Hello I'm preparing little guessing word game.
Somehow the type of my variable get changed from string to obj type what causes an Uncaught TypeError.
Here is a fragment of code:
let passwordArray = ["Java Script Developer", "FrontEnd"];
let sample = passwordArray[Math.floor((Math.random() *
passwordArray.length))];
let password = sample.toUpperCase();
let new_password = "";
for(let x =0; x<password.length;x++){
if(password[x]===" "){new_password += " "}
else{new_password += "-"}
}
$("#password span").text(new_password);
This part works correclty problem appears when I want to repalce a letter
String.prototype.replaceAt = function(index, replacement){
return this.substr(0,index) + replacement + this.substr(index + replacement.length)
};
function check(num) {
let test = false;
let temp = $(event.target).val();
if(password.indexOf(temp)>-1){test=true; /*alert(test +"/"+temp+"/"+password)*/}
$("#"+num).attr("disabled", true);
if(test === true) {
$("#"+num).removeClass("letter").addClass("hitletter");
let indeksy =[];
for(let i =0; i<password.length;i++ ){
if(password.charAt(i) === temp){indeksy.push(i)}
}
for(let x=0; x<indeksy.length;x++) {
let indx = indeksy[x];
new_password = new_password.replaceAt(indx, temp);
}
$("#password").html(new_password);
}};
My HTML basically is just:
<nav>
<input type="button" value="o mnie" id="me">
<input type="button" value="kalkulator" id="cal">
<input type="button" value="Wisielec" id="wis">
<input type="button" value="Memory" id="mem">
</nav>
<div id="content"></div>
Rest is dynamically added in JS:
$(function() {
$("#wis").click(function () {
$("#content").empty().append("" +
"<div id='container'>\n" +
"<div id='password'><span>Sample text</span></span></div>\n" +
"<div id='counter'>Counter: <span id='result'></span></div>\n" +
"<div id='gibbet' class='image'></div>\n" +
"<div id='alphabet'></div>\n" +
"<div id='new'>\n" +
"<input type='text' id='new_password'/>\n" +
"<button id='add' onclick='newPass()'>Submit</button>\n" +
"</div>\n" +
"</div>"
);
start();
});
});
function start(){
let new_password = "";
$("#contetn").empty();
let letters = "";
for(let i=0; i<32; i++){
letters += "<input class='letter' type='button' value='"+litery[i]+"' onclick='check("+i+")' id='"+i+"'/>"
}
$("#alphabet").html(letters);
$("#result").text(mistakeCounter);
for(let x =0; x<password.length;x++){
if(password[x]===" "){new_password += " "}
else{new_password += "-"}
}
$("#password span").text(new_password);
}
The problem is that variable new_password is somehow changing from type string to type object when i want to use function replaceAt()
looking at your code, with the new String.prototype.replaceAt this error can happen on 2 situations:
when the variable that uses replaceAt is not a string, example:
null.replaceAt(someIndex,'someText');
{}.replaceAt(someIndex,'someText');
[].replaceAt(someIndex,'someText');
the other situation is when you pass null or undefined as replacement:
"".replaceAt(someIndex,undefined);
"".replaceAt(someIndex,null);
just add some verification code and should be working good
I'm beginner in coding. I've tried to find similar problem on SO but with no proper result.
I'm writting a code where HTML form sends its value to an object's property, then I want to print it in document using innerHTML method. I save object in array so then I can manipulate them.
Some problems appears when I add one more dimension to my array (arr[i][j] in code below - 2nd dimension will be needed further) - then object's properties change to "undefined" when printed. What should I do to get access to object's properties in array's 2nd dimension (using JS only)? This is my JS code:
var pro = 0;
var ctg = 1;
var arr = new Array(ctg);
arr[0] = new Array(pro)
function AddProduct() {
var n = document.getElementById('name').value;
var p = document.getElementById('price').value;
pro++;
for (i = arr[0].length; i < pro; i++) {
arr[0].push([{
name: n,
price: p
}]);
}
var content = '';
for (i = 0; i < arr.length; i++) {
for (j in arr[i]) {
content += arr[i][j].name + ' price is ' + arr[i][j].price + '<br>';
}
}
document.getElementById('p').innerHTML = content;
};
and HTML in body:
<p id="p"></p>
<input type="text" id="name" placeholder="name">
<br>
<input type="text" id="price" placeholder="price">
<br>
<input type="button" value="OK" onclick=A ddProduct()>
Try substituting
onclick="AddProduct()"
for
onclick=A ddProduct()
at html; and add [0] at
content += arr[i][j][0].name + ' price is ' + arr[i][j][0].price + '<br>';
for
content += arr[i][j].name + ' price is ' + arr[i][j].price + '<br>';
as you pushed an array containing an object to arr at first for loop. To reference the index of the array, use bracket notation to retrieve object at index 0 of array in arr
var pro = 0;
var ctg = 1;
var arr = new Array(ctg);
arr[0] = new Array(pro)
function AddProduct() {
var n = document.getElementById('name').value;
var p = document.getElementById('price').value;
pro++;
for (i = arr[0].length; i < pro; i++) {
arr[0].push([{
name: n,
price: p
}]);
}
var content = '';
for (i = 0; i < arr.length; i++) {
for (j in arr[i]) {
content += arr[i][j][0].name + ' price is ' + arr[i][j][0].price + '<br>';
}
}
document.getElementById('p').innerHTML = content;
};
<p id="p"></p>
<input type="text" id="name" placeholder="name">
<br>
<input type="text" id="price" placeholder="price">
<br>
<input type="button" value="OK" onclick="AddProduct()">
Our company has a client that requires a specific checksum on their bar codes. I've come up with the following which allows the user to enter the distributor part number, our part number and our serial number. Right now, when you click save, it will calculate correctly for the bar code with the checksum. NOW, we have added a quantity box so that we can print x number of barcodes with our serial number incrementing by 1. (i.e. 1st serial number is 000001, next will be 000002 and so on). What I've been trying to do for the last week is alter this code so the user can input the part numbers and sn, and it will calculate each bar code up to the quantity.
This is what we would like to have:
If user enters part numbers, first serial number and quantity then clicks "Save" this should be the result. At present, this can only be achieved by entering each serial number and clicking save
*note: while the quantity can be entered, the actual value has not been used in my code...yet
So, to achieve this, I need to find a way to increment the serial numbers without dropping off the leading zeros but maintaining the length of qty.length.
I also need to figure out how to loop each new serial number through with part numbers to get the correct checksum for the bar code. After a week of staring at this, I'm hoping some fresh and experienced eyes can assist. Here is my code.
<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Capture Form Fields to CSV</title>
<script type="text/javascript">
<!--
function saveValues() {
var frm = document.form1;
var str = frm.text1.value + frm.text2.value + frm.text3.value;
var dpn = frm.text1.value;
var wpn = frm.text2.value;
var wsn = frm.text3.value;
var strArray = str.split("");
var calcArray = strArray;
var total =0;
for (var i = 0; i < str.length; i++)
strArray[i] = strArray[i].charCodeAt(0);
for (var i = 0; i < strArray.length; i++){
if (strArray[i] >= 65 && strArray[i] <= 90){
calcArray[i] = (strArray[i] - 64) * (i+1)
}
else if (strArray[i] >=97 && strArray[i] <=122) {
calcArray[i] = (strArray[i] - 96) * (i+1)
}
else if (strArray[i] >=48 && strArray[i] <=57) {
calcArray[i] = (strArray[i] - 48) * (i+1)
}
else {
calcArray[i] = 1 * (i+1)
}
}
for (var i in calcArray){
total += calcArray[i];}
var mod2 = str.length - (2*(Math.floor(str.length/2)));
var mod10 = (total + mod2) - (10*(Math.floor((total + mod2)/10))) ;
var chk = mod10;
var record = ""
+ dpn + "," + wpn + "," + wsn + "," +dpn + "~" + wpn + "~" + wsn + "~" + chk + "\n";
frm.textarea1.value += record;
}
function clearText() {
document.form1.textarea1.value = "";P
form1.text1.value = "";
form1.text2.value = "";
form1.text3.value = "";
}
function csvSave() {
var a = document.createElement('a');
with (a) {
href='data:text/csv;base64,' + btoa(document.getElementById('textarea1').value);
download='csvfile.csv';
}
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
}
//-->
</script>
</head>
<body>
<h1>Capture Form Fields to CSV</h1>
<form name="form1" >
<p>
Distributor Part Number: <input name="text1" type="text" value="GDM1301" /><br />
Our Part Number: <input name="text2" type="text" value="PCBDM160"/><br />
Our Serial Number: <input name="text3" type="text" value="000001"/><br />
Label Quantity: <input name="qty" type="text" value="3"/>
</p>
<p>
<input name="save" type="button" value="Save"
onclick="saveValues(); return false"/>
<input name="clear" type="button" value="Clear"
onclick="clearText(); return false"/>
<button onclick="csvSave()">CSV</button>
</p>
<p>
<i>Click 'Save' to add content</i><br />
<textarea id="textarea1" cols="80" rows="20"></textarea>
</p>
</form>
</body>
</html>
I have two javascript functions, the first one is working, teh second is working but not echoing the correct value in the hidden inputs.
Ive manage to get the last hidden input value correct but I'm not sure how
var customTicketsArr = Array();
function EditEventAddTicket(){
alertWrongTime = false;
var TicketName = jQuery("#ticketname").val();
var TicketPrice = jQuery("#ticketprice").val();
var ticketquantity = jQuery("#ticketquantity").val();
var storeString = "TicketName" + TicketName + "TicketPrice" + TicketPrice + "Quantity" + ticketquantity + '';
customTicketsArr.push(storeString);
EditEventUpdateTickets(true);
}
function EditEventUpdateTickets(fade){
jQuery("#custom_tickets_string").val(customTicketsArr);
var output = "";
var style = "";
for (i = customTicketsArr.length-1; i >= 0; i--){
ticketname = customTicketsArr[i].split("TicketName");
ticketprice = customTicketsArr[i].split("TicketPrice");
ticketquantity = customTicketsArr[i].split("Quantity");
if(fade){
if (customTicketsArr.length - 1 == i){
style = "display: none; ";
var fadeInDiv = i;
} else {
style = "";
}
}
if (i % 2 == 1) { style += "background-color: #660000; "}
html = "<div id='customticket" + i + "' class='customeventbase' style='" + style + "'>";
html += '<input type="hidden" name="customTicketid[' + i + '][Name]" id="customticketName' + i + '" value="'+ ticketname + '" />';
html += '<input type="hidden" name="customTicketid[' + i + '][Price]" id="customticketPrice' + i + '" value="' +ticketprice[1] +'" />';
html += '<input type="hidden" name="customTicketid[' + i + '][Quantity]" id="customticketQuantity' + i + '" value="'+ ticketquantity[1] +'" />';
html += '<button class="customeventdel" type="button" onClick="EditEventRemoveDate(' + i + ')"></button>';
html += '<div class="clear"></div>';
html += '</div>\n';
output += html;
}
output += "<input type='hidden' id='custom_ticket_info' name='custom_ticket_info' value='" + customTicketsArr + "' />";
jQuery("#custom_ticket_container").html(output);
if(fade){
setTimeout("EditEventfadeInDiv(" + fadeInDiv +")", 10);
}
}
this outputs:
<div style="background-color: #660000; " class="customeventbase" id="customticket1">
<input type="hidden" value=",testTicketPrice50Quantity44" id="customticketName1" name="customTicketid[1][Name]">
<input type="hidden" value="undefined" id="customticketPrice1" name="customTicketid[1][Price]">
<input type="hidden" value="44" id="customticketQuantity1" name="customTicketid[1][Quantity]">
<button onclick="EditEventRemoveDate(1)" type="button" class="customeventdel"></button>
<div class="clear"></div></div>
the values for the first two hidden fields are incorrect
They're not incorrect values - split() is doing exactly what it is supposed to - returning an array of substrings after removing the separator.
With your string structure, splitting on TicketName will give you two strings - the substring before the separator and the substring after - TicketName itself is not included.
Thus, for the string "TicketNametestTicketPrice50Quantity44", you will get "" and "testTicketPrice50Quantity44" when you split on "TicketName" . Splitting the same string on TicketPrice will give you "TicketNametest" and "50Quantity44".
I'd suggest putting objects into your array instead -
var storeObject = {
"TicketName" : TicketName,
"TicketPrice" : TicketPrice,
"Quantity" : ticketquantity
};
customTicketsArr.push(storeObject);
You can then get back the data as:
for (i = customTicketsArr.length-1; i >= 0; i--){
var currentObject = customTicketsArr[i];
var ticketname = currentObject.TicketName;
var ticketprice = currentObject.TicketPrice;
var ticketquantity = currentObject.Quantity;
//do other stuff here
}
why do you save it as a string? I would recommend storing it in an object:
function EditEventAddTicket(){
alertWrongTime = false;
var TicketName = jQuery("#ticketname").val();
var TicketPrice = jQuery("#ticketprice").val();
var ticketquantity = jQuery("#ticketquantity").val();
var ticket = {"TicketName": TicketName, "TicketPrice": TicketPrice, "Quantity": ticketquantity};
customTicketsArr.push(ticket);
EditEventUpdateTickets(true);
}
and then you can simply load the data:
for (i = customTicketsArr.length-1; i >= 0; i--){
ticketname = customTicketsArr[i].TicketName;
ticketprice = customTicketsArr[i].TicketPrice;
ticketquantity = customTicketsArr[i].Quantity;
// ...
}
Why not just make a two dimensional array?
var customTicketsArr = Array();
function EditEventAddTicket() {
customTicketsArr.push({
'name' : jQuery("#ticketname").val(),
'price' : jQuery("#ticketprice").val(),
'qty' : jQuery("#ticketquantity").val()
});
}