I have two textbox's. Textbox one has the remaining hp that it gets from a variable. Textbox two has a button that when you click it, it runs dmgNPC and subtracts the damage that you enter into the textbox from the hp text box.
The question i have is how do i get JS to subtract from the new value that it shown in the remaining hp textbox?
var hp = 10;
function dmgNPC(hp) {
var damage = document.getElementById("damage").value;
var theDMG = hp - damage;
return document.getElementById("remaining").value = theDMG;
}
<label for="damage">Damage to NPC</label>
<input type="text" id="damage">
<button type="button" onclick="dmgNPC(hp);">Enter Damage</button>
<br/>
<label for="remaining">Remaining Health</label>
<input type="text" id="remaining">
I think you want something like this
var hp = 10;
function dmgNPC() {
var damage = document.getElementById("damage").value;
hp -= damage;
document.getElementById("remaining").value = hp;
}
<label for="damage">Damage to NPC</label>
<input type="text" id="damage">
<button type="button" onclick="dmgNPC();">Enter Damage</button>
<br/>
<label for="remaining">Remaining Health</label>
<input type="text" id="remaining">
Geoffrey let me see if I understand this. You want to subtract from 10 at the beginning but after that take from the remaining value so you can work your way down to 0 health? If so here is the JS I wrote for that.
var hp = 10;
function dmgNPC(hp) {
if(document.getElementById("remaining").value){
var damage = document.getElementById("damage").value;
var theDMG = document.getElementById("remaining").value - damage;
}else{
var damage = document.getElementById("damage").value;
var theDMG = hp - damage;
}
document.getElementById("remaining").value = theDMG;
}
Related
I am trying to create a subtotal calculator using JavaScript that would automatically multiply the price (in £) of a certain product by the quantity selected by the user.
I have been at this for a few days now. I am working with a constructor and am trying to modify its code. I have tried several approaches using JavaScript and so far none of them worked.
Here is the HTML code I have added to the product page:
<div class="data">
<input class="form-input form-input--incrementTotal"
id="qty[]"
name="qty[]"
type="number"
value="{{#if product.min_purchase_quantity}} {{product.min_purchase_quantity}}{{else}}1{{/if}}"
data-quantity-min="{{product.min_purchase_quantity}}"
data-quantity-max="{{product.max_purchase_quantity}}"
min="1"
pattern="[0-9]*"
aria-live="polite">
<span id="price" data-product-price-without-tax class="price price--withoutTax{{#if price.with_tax}} price-section--minor{{/if}}">{{price.without_tax.formatted}}</span>
<span id="price1" class=price1></span>
<div id="total" class="total"></div>
<div id="total1" class="total1"></div>
</div
Approach 1:
<script>
var priceRange = document.getElementById("qty[]").value;
var priceAmount = $('#price').html();
var removeEuro = priceAmount.replace("£", "");
var total = parseFloat(removeEuro) * parseFloat(priceRange);
$('#total').text('£' + total);
</script>
Approach 2:
<script>
var price1 = parseFloat($("#price").text().split('£')[1]);
$("#price1").text(price1);
var r, i;
r = document.getElementsByClassName("data");
for(i=0;i<r.length; i++){
r[i].getElementsByClassName("total")[0].innerHTML =
r[i].getElementsByClassName("price1")[0].innerText *
r[i].getElementsByClassName("form-input--incrementTotal") [0].value;
}
function total(element) {
var tr = element.parentNode.parentNode;
var price = tr.getElementsByClassName("form-input--incrementTotal") [0].innerText;
tr.getElementsByClassName("total")[0].innerHTML = price * element.value;
}
function sumTotal(){
var tot = 0 ;
var len = document.getElementsByClassName("total").length;
for(var i =0; i<len; i++){
tot += parseInt(document.getElementsByClassName("total") [i].innerText);
}
}
$('#total1').html('£' + parseFloat($('#total').text()))
</script>
Neither of the approaches worked. I keep getting an NaN error. I do not understand why it's telling me the result is not a number. Perhaps {{price.without_tax.formatted}} could be what's causing the issue? Can someone please help me with my code?
I input the values, and it works ONCE, which is a problem.
I try to change the numbers, and click Enter again, and it does nothing.
The only way it works again is if I use the scroll to up or down the current value.
var fuel = 2.5;
var mpg = 6;
function Hourly() {
var miles = document.getElementById('miles').value;
var brokerPay = document.getElementById('pay').value;
var gallons = miles / 6;
var hours = miles / 55;
var cost = gallons * fuel;
var net = brokerPay - cost
var hourlyPay = net / hours;
var newHeader = document.getElementById('changeMe');
newHeader.innerHTML = hourlyPay;
}
<h1 id="changeMe">Change me Here</h1>
<input type="number" placeholder="miles" id="miles" required/>
<input type="number" placeholder="Broker Pay" id="pay" required/>
<input type="submit" value="Enter" onclick="Hourly()" />
I am trying to perform calculation using JavaScript. When user enter less than 10 pages in input (#page) the cost is 1. if he adds more than 10, each page costs .10. there are 2 options for checkbox, if he clicks first checkbox 10 is added and second checkbox 15 is added.
This is working when it is done in sequential steps. (input then clicking checkbox).
Ex: Input is : 9 (total: 1)
click checkbox1 - duplicates (total : 11)
click checkbox1 - laser (total: 26)
Now if i change the Input to 11, then the total becomes 1.10 - even if both the checkboxes are checked.. (expected result should be - 26.10)
I am not sure how to do this...can anyone help me out
<html>
<head>
<title>Calculation</title>
<script>
function calculate() {
var pages=document.getElementById("page").value;
if(pages <=10) {
total.value=1;
}
if(pages >= 11) {
var extra_pages= pages - 10;
var new_total= extra_pages * .10;
var new_total1= 1 + new_total;
total.value= new_total1;
}
}
function checkbox1() {
if(document.getElementById("ckbox1").checked === true) {
var total1=document.getElementById("total").value;
const add1 = 10;
var check1 = +total1 + +add1;
total.value=check1;
}
if(document.getElementById("ckbox1").checked === false) {
var total1=document.getElementById("total").value;
const sub1 = 10;
var check2 = +total1 - +sub1;
total.value = check2;
}
}
function checkbox2() {
if(document.getElementById("ckbox2").checked === true) {
var total1=document.getElementById("total").value;
const add1 = 15;
var check1 = +total1 + +add1;
total.value=check1;
}
if(document.getElementById("ckbox2").checked === false) {
var total1=document.getElementById("total").value;
const sub1 = 15;
var check2 = +total1 - +sub1;
total.value = check2;
}
}
</script>
<body>
Enter a Number: <input type="text" id="page" value="1" oninput="calculate()">
<br>
<br><br><br><br>
duplicates <input type="checkbox" id="ckbox1" onclick="checkbox1()">
laser print: <input type="checkbox" id="ckbox2" onclick="checkbox2()"> <br><br>
Total: <input type="text" id="total">
</body>
</html>
You can use calculate for all changes instead of creating each one for each input, which makes the calculation complex.
// Get reference to inputs.
var page = document.getElementById("page");
var total = document.getElementById("total");
var dup = document.getElementById("ckbox1");
var laser = document.getElementById("ckbox2");
function calculate() {
// To Number
var pages = parseInt(page.value, 10);
var value = 0;
if (pages <= 10) {
value = 1;
} else {
var extra_pages = pages - 10;
var new_total = extra_pages * .10;
var new_total1 = 1 + new_total;
value = new_total1;
}
// Add 10 if dup is checked.
if (dup.checked) {
value += 10;
}
// Add 15 if laser is checked.
// These can be moved out like
// const laserVal = 15;
// value += laserVal if you don't want magic number here.
if (laser.checked) {
value += 15;
}
// Truncate float.
total.value = value.toFixed(1);
}
Enter a Number:
<input type="text" id="page" value="1" oninput="calculate()">
<br>
<br>
<br>
<br>
<br>
duplicates:<input type="checkbox" id="ckbox1" onclick="calculate()">
laser print:<input type="checkbox" id="ckbox2" onclick="calculate()">
<br>
<br>Total:
<input type="text" id="total">
i have a function that increments a number, takes the total and multiplies it by a price. However, when I click the button that increments for the first time it doesn't do anything. I click the button a second time and it works. However if I then click the button that decreases, then it does the previous function (e.g. adding) then pressing it a second time will decrease the value.
I understand that the onClick="myFunction()" may be in the wrong place, however I don't know where to put it. I want the total to be calculated automatically. A demo can be found at http://alpha.kentishtours.co.uk/destinations/bruges.php
The function that takes the value and multiplies it and calculates the total.
function myFunction()
{
var a = document.getElementById('adult').value;
z=39;
x=a*z;
var c = document.getElementById('child').value;
if(a >= 1) {
a=+30; }
else {
a=+39; }
b=c;
c=a*b
d=x+c
document.getElementById("total").innerHTML=d;
document.getElementById("value").value = d;
}`
These are the buttons that increment the number and call the function to calculate.
<div class="calculator">
<div class="calculator-submodule input-group">
<h4>Adult (12+)</h4>
<button class="btn theme-btn" id="decrease" value="Decrease Value" onClick="myFunction()" >-</button>
<input type="text" id="adult" value="1" class="form-control input-usmall" min="0" disabled>
<button class="btn theme-btn" id="increase" value="Increase Value" onClick="myFunction()" >+</button>
</div>
<div class="calculator-submodule input-group">
<h4>Child (2-11)</h4>
<button class="btn theme-btn" id="decreasec" value="Decrease Value" onClick="myFunction()" >-</button>
<input type="text" id="child" value="0" class="form-control input-usmall" min="0" disabled>
<button class="btn theme-btn" id="increasec" value="Increase Value" onClick="myFunction()" >+</button>
</div>
<div class="calculator-submodule">
<span class="pound">£</span>
<span id="total">39</span><span class="pound">.00</span>
</div>
You have functions in your increment.js script that change the value of the input after you get them in "myfuntion". You need to calculate the prices after the values are changed.
So first you should remove the lines below from this file:
http://alpha.kentishtours.co.uk/assets/scripts/increment.js
$("#increase").click(function(){
var $n = $("#adult");
$n.val(Number($n.val())+1);
});
$("#decrease").click(function(){
var $n = $("#adult");
$n.val(Number($n.val())-1);
});
$("#increasec").click(function(){
var $n = $("#child");
$n.val(Number($n.val())+1);
});
$("#decreasec").click(function(){
var $n = $("#child");
$n.val(Number($n.val())-1);
});
Also remove the onClick="myFunction()" attribute in your HTML form.
Then change all your myFunction script to this:
var adult = $('#adult'),
child = $('#child'),
total = $('#total'),
value = $('#value'),
increase = $('#increase'),
decrease = $('#decrease'),
increasec = $('#increasec'),
decreasec = $('#decreasec');
var calulate_price = function(a, c){
var p1 = 39,
p2 = 30,
PA = a * p1,
PC, d;
if(a >= 1) PC = c * p2;
else PC = c * p1;
d = PA + PC;
total.text(d);
value.val(d);
};
increase.click(function(){
var a = Number(adult.val());
var c = Number(child.val());
adult.val(++a);
calulate_price(a, c);
});
decrease.click(function(){
var a = Number(adult.val());
var c = Number(child.val());
adult.val(--a);
calulate_price(a, c);
});
increasec.click(function(){
var a = Number(adult.val());
var c = Number(child.val());
child.val(++c);
calulate_price(a, c);
});
decreasec.click(function(){
var a = Number(adult.val());
var c = Number(child.val());
child.val(--c);
calulate_price(a, c);
});
Everything working: http://jsbin.com/ohUniCa/2/edit?js,output
I have a list of radio buttons represented by this code:
<form id="menu4strombolis">
input1 <input type="radio" name="menu1"><br />
input2 <input type="radio" name="menu2"><br />
input3 <input type="radio" name="menu3"><br />
input4 <input type="radio" name="menu4"><br />
input5 <input type="radio" name="menu5"><br />
input6 <input type="radio" name="menu6"><br />
input7 <input type="radio" name="menu7"><br />
</form>
Whenever a button is selected I need the subtotal and total to be updated.
This is how i want it to look.
Subtotal: <br />
Tax:<br />
Total:<br />
Where tax is always %7 or .7
The prices of menu 1 through 7 increments by $5. Menu1 is $5, menu2 is $10 and so forth.
I was trying to figure out the JavaScript to this but the problem is that i don't want it to display right after the buttons I want it displayed on the bottom of the page.
If I do document.write the whole page gets overwritten. Please help me on this issue guys. I am sure it's really simple.
Preamble
This sounds like homework to me. However, I find that the best way to learn, is by example.
So here's me, leading by example, OK?
You didn't give me much to go on, so for the sake of this example, I'm assuming you've got a list of checkboxes or radiobuttons that say Menu 1... Menu n. Each checkbox that is checked will be added to the subtotal, and then the tax calculated on top of that.
Doing it with radio buttons is a little easier, so I added that example as well.
On the bottom of the post are references for future study on what is used in this example.
If you have any further questions please ask them in the comment area at the bottom of this post.
The Javascript (checkboxes) | JSFiddle example (see it in action)
//Set the tax and base cost
var f_tax = 0.07,
i_menu_base = 5;
//Declare all the variables that will be used
var e_menu = document.getElementById("menu"),
e_checkboxes = e_menu.getElementsByTagName("input"),
e_subtotal = document.getElementById("sub_total");
// Add event listeners for when any checkbox changes value
for(var i = 0; i < e_checkboxes.length; i++){
e_checkboxes[i].onchange = function(){
//Recalculate subtotal
get_subtotal();
}
}
//get_subtotal calculates the subtotal based on which checkboxes are checked
function get_subtotal(){
var f_sub_total = 0.0,
f_grand_total = 0.0;
var subtotal, tax, grandtotal;
for(var i = 1; i <= e_checkboxes.length; i++){
//If the checkbox is checked, add it to the total
if(e_checkboxes[i-1].checked){
f_sub_total += i * i_menu_base;
}
}
//Calculate the grand total
f_grand_total = f_sub_total*(1+f_tax);
//Format them
subtotal = (Math.round(f_sub_total*100)/100).toFixed(2);
tax = (Math.round(f_tax*10000)/100).toFixed(2);
grandtotal = (Math.round(f_grand_total*100)/100).toFixed(2);
//Add them to the display element
e_subtotal.innerHTML = "Subtotal: "+subtotal+"<br />";
e_subtotal.innerHTML += "Tax: "+tax+"%<br />";
e_subtotal.innerHTML += "Total: "+grandtotal;
}
The Javascript (radio buttons) | JSFiddle example (see it in action)
//Set the tax
var f_tax = 0.07,
i_menu_base = 5;
//Declare all the variables that will be used
var e_menu = document.getElementById("menu"),
e_radios = e_menu.getElementsByTagName("input"),
e_subtotal = document.getElementById("sub_total");
// Add event listeners for when any checkbox changes value
for(var i = 0; i < e_radios.length; i++){
e_radios[i].onchange = function(){
//Recalculate subtotal
get_subtotal(this);
}
}
//get_index gets the index of the element (1..n)
function get_index(element){
for(var i = 1; i <= e_radios.length; i++){
if(e_radios[i-1] == element){
return i;
}
}
}
//get_subtotal calculates the subtotal based on the radio that was changed
function get_subtotal(el){
var f_sub_total = 0.0,
f_grand_total = 0.0;
var subtotal, tax, grandtotal;
f_sub_total += get_index(el) * i_menu_base
//Calculate the grand total
f_grand_total = f_sub_total*(1+f_tax);
//Format them
subtotal = (Math.round(f_sub_total*100)/100).toFixed(2);
tax = (Math.round(f_tax*10000)/100).toFixed(2);
grandtotal = (Math.round(f_grand_total*100)/100).toFixed(2);
//Add them to the element
e_subtotal.innerHTML = "Subtotal: "+subtotal+"<br />";
e_subtotal.innerHTML += "Tax: "+tax+"%<br />";
e_subtotal.innerHTML += "Total: "+grandtotal;
}
References for future study
In order in which they appear
getElementById()
getElementsByTagName()
looping through an array
onchange
Math.round(), decimal trick and toFixed()
innerHTML
Despite any additonal input from you, and my better judgement, I was bored so I did it all.
HTML:
<form id="menu4strombolis">input1
<input type="radio" name="menu1" value="5">
<br>input2
<input type="radio" name="menu2" value="10">
<br>input3
<input type="radio" name="menu3" value="15">
<br>input4
<input type="radio" name="menu4" value="20">
<br>input5
<input type="radio" name="menu5" value="25">
<br>input6
<input type="radio" name="menu6" value="30">
<br>input7
<input type="radio" name="menu7" value="35">
<br>
</form>
<button id="getTotal">Total</button>
<div id="subtotal">Sub-Total:</div>
<div id="tax">Tax:</div>
<div id="total">Total:</div>
JS:
var button = document.getElementById("getTotal");
button.onclick = function () {
var subtotalField = document.getElementById("subtotal");
var radios = document.forms["menu4strombolis"].getElementsByTagName("input");
var subtotal = 0;
var tax = 0;
var total = 0;
for (var i = 0, length = radios.length; i < length; i++) {
if (radios[i].checked) {
subtotal += parseInt(radios[i].value);
}
}
tax = (subtotal * .07).toFixed(2); ;
total = subtotal + tax;
document.getElementById("subtotal").innerHTML = "Sub-Total: $" + subtotal;
document.getElementById("tax").innerHTML = "Tax: $" + tax;
document.getElementById("total").innerHTML = "Total: $" + total;
};
and the working fiddle:
http://jsfiddle.net/RGvTt/1/
Though on a side note, you should either group some of the radios together in the same group... or make them checkboxs.
Updated to fix the bug that the OP couldn't fix:
http://jsfiddle.net/RGvTt/4/
Need to use parseFloat.
iPhone fiddle programming FTW!
What you want is element.innerHTML
So it would look something like this:
<form id="menu4strombolis">
input1 <input type="radio" name="menu1"><br />
input2 <input type="radio" name="menu2"><br />
input3 <input type="radio" name="menu3"><br />
input4 <input type="radio" name="menu4"><br />
input5 <input type="radio" name="menu5"><br />
input6 <input type="radio" name="menu6"><br />
input7 <input type="radio" name="menu7"><br />
</form>
..... ..html stuff here
Subtotal: <span id="subtotal"></span><br/>
Tax: <span id="tax"></span><br/>
Total: <span id="total"></span><br/>
ETC...
<script>
var subtotal = //whatever menu item is checked then .value();
var span_subtotal = document.getElementById("subtotal);
var tax = document.getElementById("tax");
var total = document.getElementById("total");
var the_tax = subtotal * .07;
span_subtotal.innerHTML = subtotal;
tax.innerHTML = the_tax;
total.innerHTML = subtotal + the_tax;
<script>