Develop Reference

Addition/subtraction to a specific value to user input

Is it possible to have a textbox where the user will input a number and in another textbox, which will automatically add 5 to the value of the first textbox and subtract 5 to the value in the third textbox?
For example:
User input: 10
2nd textbox: 15
3rd textbox: 5
Please help

You can do it like this:
<input type="text" id="input1" onkeyup="setValues(this.value);">
<input type="text" id="input2">
<input type="text" id="input3">
<script type="text/javascript">
function setValues(value){
document.getElementById('input2').value = (parseInt(value)+5);
document.getElementById('input3').value = (parseInt(value)-5);
}
</script>

you can find solution Link.
HTML Part
<input type="number" id="input1">
<input type="number" id="input2">
<input type="number" id="input3">
JS Part
$('#input1').bind('click keyup', function(event) {
$('#input2').val(parseInt(this.value)+5);
$('#input3').val(parseInt(this.value)-5);
})

add dynamically generated fields from form

Hi guys i want to dynamically add a group of input fields when a button is pressed. This works with 1 group, but not with more than one. Here is my HTML:
<form action="address.php" method="POST">
<div id="list">
<input type="text" name="address" placeholder="Address">
<input type="text" name="suburb" placeholder="Suburb">
<input type="text" name="state" placeholder="State">
<input type="text" name="country" placeholder="Country">
<button id="addMore">Add Address</button>
</div>
</form>
I'm calling the addMore function with this javascript:
$(function(){
$("#addMore").click(function(e){
e.preventDefault();
$("#list").append("<input type="text" name="address" placeholder="Address"><input type="text" name="suburb" placeholder="Suburb"><input type="text" name="state" placeholder="State"><input type="text" name="country" placeholder="Country"><button id="addMore2">Add Address</button></div>");
});
});
I've added a button at the end with an id of addMore2 because i wanna generate a similar set of input controls but with different names. I want to call that id with this function:
$(function(){
$("#addMore2").click(function(e){
e.preventDefault();
$("#list").append("<input type="text" name="address2" placeholder="Address"><input type="text" name="suburb2" placeholder="Suburb"><input type="text" name="state2" placeholder="State"><input type="text" name="country2" placeholder="Country"><button id="addMore3">Add Address</button></div>");
});
});
... and then another set of controls with the function addMore3. Same as above, but with the number 3.
If i use each function alone, it works. But if i try to use all 3 together, it doesn't work. How can i dynamically reproduce a set of input controls with different names?

you could do something like this
$(var count = 0;
$("#addMore2").click(function(e){
e.preventDefault();
$("#list").append("<input type='text' name='address2'"+count+" placeholder="Address"><input type="text" name='suburb2'"+count+" placeholder="Suburb"><input type="text" name='state2'"+count+" placeholder="State"><input type="text" name='country2'"+count+" placeholder="Country"><button id='addMore3'"+count+">Add Address</button></div>");
count++;
});
});

#rayzor
You need to append your code before button
Please use below code:
jQuery("#addMore").click(function(e){
jQuery('<br><input type="text" name="address" placeholder="Address"><input type="text" name="suburb" placeholder="Suburb"><input type="text" name="state" placeholder="State"><input type="text" name="country" placeholder="Country">').insertAfter("input:last");
return false;
});
And remove code for $("#addMore2").click event

There's no need to add Addmore 2,3,etc manually. the js will add it automatically, as much as your want. Feel free to see this one: https://phppot.com/jquery/jquery-ajax-inline-crud-with-php/

How to calculate form fields values to update hidden field value?

I want to know how to calculate the input values of the following fields
<input type="text" name="score1" class="auto-sum">
<input type="text" name="score2" class="auto-sum">
<input type="text" name="score3" class="auto-sum">
And update the span text and the hidden field value
TOTAL <span id="amountTotal">0 </span>
<input id="total" type="hidden" name="total" value="">
Thanks in advance

This should do what you want to achieve:
function displaySum () {
var sum = 0;
// iterate over the input fields
$('.auto-sum').each(function () {
var value = $(this).val() || 0;
var number = parseInt(value, 10); // parse the input value to an integer
if (isNaN(number)) {
number = 0;
}
sum += number; // add the value to the sum
});
// set the value of the two elements
$('#amountTotal').text(sum);
$('#total').val(sum);
}
// whenever the value of one of the input fields changes, call the displaySum function
$('.auto-sum').on('change, keyup', displaySum);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" name="score1" class="auto-sum">
<input type="text" name="score2" class="auto-sum">
<input type="text" name="score3" class="auto-sum">
TOTAL <span id="amountTotal">0 </span>
<input id="total" type="hidden" name="total" value="">

I tried with blur method for after mouseleave from input and check all input values and added ! Then update to wanted element !!
$("input").on("blur",function(){
var total = 0;
$("[type='text']").each(function(){
if($(this).val() != "") {
total += parseInt($(this).val());
}
});
$("#amountTotal").text(total);
$("#total").val(total);
});

Try with query each() function .Use with parseFloat convert the string to number .for real time update do with keyup event
$('.auto-sum').keyup(function(){
var a=0;
$('.auto-sum').each(function(){
a+=parseFloat($(this).val())
})
$('#amountTotal').text(a|0)
$('#total').val(a|0)
console.log($('#total')[0].outerHTML)//its show the hidden field value
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" name="score1" class="auto-sum" value="2" >
<input type="text" name="score2" class="auto-sum" value="5">
<input type="text" name="score3" class="auto-sum" value="5">
TOTAL <span id="amountTotal" >0 </span>
<input id="total" type="hidden" name="total" value="">

You can use <input type="number" /> inputs to force values entered to be a number.
From there you can call jQuery with the query selector input.auto-sum to get all of the input elements with the class auto-sum
Using the each function you can add the numeric to an accumulator to get the total.
You can then use jQuery with the query selectors needed to set any other elements on the page with the Total value.
function getTotal() {
var total=0;
$('input.auto-sum').each(function(i,e)
{
total += Number($(e).val());
});
$('#amountTotal').text(total);
$('#total').val(total);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
Score 1: <input type="number" name="score1" class="auto-sum"><br />
Score 2: <input type="number" name="score2" class="auto-sum"><br />
Score 3: <input type="number" name="score3" class="auto-sum"><br />
TOTAL: <span id="amountTotal">0 </span><br />
<input id="total" type="hidden" name="total" value="">
<input type="button" id="btnTotal" onclick="getTotal()" value="Get Total" />

Please try this one.
$('.auto-sum').on('change',function(){
var totalvalue=0;
$('.auto-sum').each(function(a,b){
totalvalue=totalvalue+parseInt(($(b).val()=='' || isNaN($(b).val()))?0:$(b).val());
});
$('#amountTotal').text(totalvalue);
$('#total').val(totalvalue);
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" name="score1" class="auto-sum">
<input type="text" name="score2" class="auto-sum">
<input type="text" name="score3" class="auto-sum">
TOTAL <span id="amountTotal">0</span>
<input id="total" type="hidden" name="total" value="">

<input type="text" name="score1" class="auto-sum">
<input type="text" name="score2" class="auto-sum">
<input type="text" name="score3" class="auto-sum">
<input type="button" id="calculator" value="Caculate">
$("#calculator").on("click",function (){
var result=0;
var sum_fields=$(".auto-sum");
for(var i=0;i<sum_fields.length;i++){
if(!isNaN(sum_fields[i]) && sum_fields[i]>0){
result += sum_fields[i];
}
}
$("#amountTotal").text(result);
$("#total").val(result);
});
Create array for the fields and loop through them
Check if it not a NaN and more than 0 add them to the result then after the loop attach the result to the hidden field and as a span text

I post this as an answer because the comment areas are to small
At first i think it´s an good idea to write
<input type = "number">
when you don´t want to display the small arrows look at this solution:
https://css-tricks.com/snippets/css/turn-off-number-input-spinners/
the keyup event ist the best way to "live" display the total sum
At last take a look at vue.js
This is the best solution for this scenario.

if you're interested in a pure javascript solution:
All inputs have an oninput event attribute that fires when the input is changed.
You can attach an event handler to the event like so:
<input oninput="updateTotal" />
where updateTotal is a function declared in your script:
function updateTotal { /* code that updates the total */ }
OR if you select the input in your script then you can attach the event handler like this:
selectedInput.oninput = function updateTotal () {
...
}
Here's my implementation that selects all the inputs with the class "auto-sum", assigns the event handler to each of them and updates the code by looping over each input's value attribute:
https://jsfiddle.net/billy_reilly/5dd24v81/2/

function displaySum () {
var sum = 0;
// iterate over the input fields
$('.auto-sum').each(function () {
var value = $(this).val() || 0;
var number = parseInt(value, 10); // parse the input value to an integer
if (isNaN(number)) {
number = 0;
}
sum += number; // add the value to the sum
});
// set the value of the two elements
$('#amountTotal').text(sum);
$('#total').val(sum);
}
// whenever the value of one of the input fields changes, call the displaySum function
$('.auto-sum').on('change, keyup', displaySum);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" name="score1" class="auto-sum">
<input type="text" name="score2" class="auto-sum">
<input type="text" name="score3" class="auto-sum">
TOTAL <span id="amountTotal">0 </span>
<input id="total" type="hidden" name="total" value="">

How to set sum value on text feild when second value is set text?

This is my demo cord.
<input type="text" id="my_input1" />
<input type="text" id="my_input2" />
<input type="text" id="total" />
<input type="button" value="Add Them Together" onclick="doMath();" />
<script type="text/javascript">
function doMath()
{
// Capture the entered values of two input boxes
var my_input1 = document.getElementById('my_input1').value;
var my_input2 = document.getElementById('my_input2').value;
// Add them together and display
var sum = parseFloat(my_input1) + parseFloat(my_input2);
document.getElementById('total').value=sum;
}
I want to work this function when my_input2 is enter it's value. Just like onclick method for button is there any event to set value to total tetxfeild after key release event?

<script type="text/javascript">
$(document).ready(function () {
$("#my_input2").blur(function () {
var sum = parseInt($("#my_input1").val()) + parseInt($("#my_input2").val());
$("#total").val(sum);
});
});
</script>
<div>
<input type="text" id="my_input1" />
<input type="text" id="my_input2" />
<input type="text" id="total" />
<input type="button" value="Add Them Together" />
</div>
And also u should frame ur question correctly bcz u have added code in button click and asking us it should work after leaving textbox

Put onkeyup() on second input field this will fire your function.
Something like that:
<input type="text" id="my_input2" onkeyup="doMath();" />

try this
<input type="text" id="my_input2" onchange="doMath();" />

Subtotal of Values in HTML Table

I have a table laid out like so:
<table border="0">
<tr>
<td>10: <input type="text" size="1" autocomplete="off" name="10"/> </td>
<td>12: <input type="text" size="1" autocomplete="off" name="12"/> </td>
<td>14: <input type="text" size="1" autocomplete="off" name="14"/> </td>
<td>16: <input type="text" size="1" autocomplete="off" name="16"/> </td>
<td>18: <input type="text" size="1" autocomplete="off" name="18"/> </td>
<td>20: <input type="text" size="1" autocomplete="off" name="20"/> </td>
<td>22: <input type="text" size="1" autocomplete="off" name="22"/> </td>
</tr>
</table>
I need to multiply the value that is inputted in the input box by 65 and generate a subtotal in dollars in real time. I've looked around and I'm not too proficient in javascript or jquery so I was wondering if such a solution already existed, or if someone could point me in the right direction in creating one.

using .on and .val() you can get all the values of input . Then you can do what ever operations you want
http://api.jquery.com/on/
http://api.jquery.com/val/

You need to handle the change() event on each input:
$('input').change(function () {
var that = $(this);
that.siblings('div').text(parseInt(that.val(), 10) * 65);
});
http://jsfiddle.net/XZNfS/

Add this to the bottom of your HTML: Subtotal: <span id="subtotal"></span>
Make sure jQuery is loaded, and then toss this JavaScript below the HTML:
<script type="text/javascript">
function compute_subtotal() {
var total = 0;
$("input[type=text]").each( function(i,e) {
var value = $(e).val();
if( parseInt(value) > 0 ) total += (65 * parseInt(value));
});
$("#subtotal").html( total );
}
jQuery(document).ready( function() {
$("input[type=text]").change( function() { compute_subtotal(); } );
$("input[type=text]").keyup( function() { compute_subtotal(); } );
});
</script>