Develop Reference

summing up in js with 2 options checked

i have this code in html
<input type="checkbox" value="12" id="logo" checked onchange="calculate(this);">
<input type="checkbox" value="19" id="bc" checked onchange="calculate(this);">
<input type="checkbox" value="200" id="first" onchange="calculate(this);">
<input type="checkbox" value="250" id="second" onchange="calculate(this);">
<p id="total"></p>
and then the js
var total = 0;
function calculate(option) {
if (option.checked) {
total += Number(option.value);
} else {
total -= Number(option.value);
}
document.getElementById("total").innerHTML = total;
}
i need the first two checked checkboxes to sum up from start when page loads
and after the behavior of js to get me to 0 or to total of checkboxes when checking respectively unchecking

You could add an eventlistener to the page loading and just select the options using querySelectorAll("input[type=checkbox]") which selects all checkboxes, iterarate over them and sum them up.
var total = 0;
function calculate(option) {
if (option.checked) {
total += Number(option.value);
} else {
total -= Number(option.value);
}
document.getElementById("total").innerHTML = total;
}
window.addEventListener("load", function() {
var options = document.querySelectorAll("input[type=checkbox]");
for (var i = 0; i < options.length; i++) {
const o = options[i];
if (o.checked) total += Number(o.value);
}
document.getElementById("total").innerHTML = total;
}, false);
<input type="checkbox" value="12" id="logo" checked onchange="calculate(this);">
<input type="checkbox" value="19" id="bc" checked onchange="calculate(this);">
<input type="checkbox" value="200" id="first" onchange="calculate(this);">
<input type="checkbox" value="250" id="second" onchange="calculate(this);">
<p id="total"></p>

Use a class:
<input type="checkbox" value="12" id="logo" class='summary' checked>
<input type="checkbox" value="19" id="bc" class='summary' checked>
<input type="checkbox" value="200" id="first" class='summary'>
<input type="checkbox" value="250" id="second" class='summary'>
document.addEventListener('DOMContentLoaded', function() {
var summerizers = document.querySelectorAll('.summary'),
counter = document.getElementById('counter');
for (var i = 0, c = summerizers.length; i < c; i++) {
summerizers[i].addEventListener('change', count);
}
count();
function count() {
var total = 0;
for (var i = 0, c = summerizers.length; i < c; i++) {
if (summerizers[i].checked) {
total += parseInt(summerizers[i].value, 10);
}
}
counter.value = total;
}
});
https://jsfiddle.net/r1khjrsd/

You can call the function, then recall the function onchange event. Don't need to pass this as parameter
function calculate() {
total = 0;
elements = document.getElementsByTagName('input');
for (let i = 0; i < elements.length; i++) {
if (elements[i].checked) {
total += Number(elements[i].value);
}
}
document.getElementById('total').innerHTML = total;
}
calculate();
<input type="checkbox" value="12" id="logo" checked onchange="calculate();">
<input type="checkbox" value="19" id="bc" checked onchange="calculate();">
<input type="checkbox" value="200" id="first" onchange="calculate();">
<input type="checkbox" value="250" id="second" onchange="calculate();">
<p id="total"></p>

To achieve expected result, use initial flag checking initial page load and checkTotal function to checked boxes on initial load
Steps:
Function checkedTotal to check all checked checkboxes and call calculate function with boolean value start
If start is true, only add checked checkbox values and restrict else part in calculate functionenter code here
code sample - https://codepen.io/nagasai/pen/XEyqEd?editors=1111
var total = 0;
function calculate(option,start) {
if (option.checked) {
total += Number(option.value);
} else {
if(!start){
total -= Number(option.value);
}
}
document.getElementById("total").innerHTML = total;
}
function checkedTotal(){
var checkList = document.getElementsByTagName('input');
for(var i =0; i < checkList.length; i++){
calculate(checkList[i], true)
}
}
checkedTotal()
<input type="checkbox" value="12" id="logo" checked onchange="calculate(this);">
<input type="checkbox" value="19" id="bc" checked onchange="calculate(this);">
<input type="checkbox" value="200" id="first" onchange="calculate(this);">
<input type="checkbox" value="250" id="second" onchange="calculate(this);">
<p id="total"></p>

Adding up total price of selected items (Javascript)

I ran into a problem. Code is here:
// JavaScript Document
window.totalIt= function() {
var input = document.getElementsByName("product");
var total = 0;
for (var i = 0; i < input.length; i++) {
if (input[i].checked) {
total += 1;
}
}
if(total>=3){
document.getElementById("total").value = "$" + (total*29).toFixed(2);
}
else{
document.getElementById("total").value = "$" + (total*39).toFixed(2);
}
}
window.totalPrisDessert= function() {
var input = document.getElementsByName("dessert");
var total = 0;
for (var i = 0; i < input.length; i++) {
if (input[i].checked) {
total += parseFloat(input[i].value);
}
}
document.getElementById("total").value = "$" + total.toFixed(2);
}
<div id="formular">
<div id="formulartekst">
<form>
<h2 class="formskrift">Order Hot Food</h2>
<p class="kroner">$39 / $29 when 3 or more checked</p>
<input name="product" value="39" type="checkbox" id="p1" onclick="totalIt()" /> Monday
<br>
<input name="product" value="39" type="checkbox" id="p2" onclick="totalIt()" /> Tuesday
<br>
<input name="product" value="39" type="checkbox" id="p3" onclick="totalIt()" /> Wednesday
<br>
<input name="product" value="39" type="checkbox" id="p4" onclick="totalIt()" /> Thursday
<br>
<input name="product" value="39" type="checkbox" id="p5" onclick="totalIt()" /> Friday
<h2 class="formskrift">Dessert</h2>
<p class="kroner">$20 ALWAYS</p>
<input name="dessert" value="20" type="checkbox" id="p6" onclick="totalPrisDessert()"/>
Monday<br>
<input name="dessert" value="20" type="checkbox" id="p7" onclick="totalPrisDessert()"/>
Tuesday<br>
<input name="dessert" value="20" type="checkbox" id="p8" onclick="totalPrisDessert()"/>
Wednesday<br>
<input name="dessert" value="20" type="checkbox" id="p9" onclick="totalPrisDessert()"/>
Thursday<br>
<input name="dessert" value="20" type="checkbox" id="p10" onclick="totalPrisDessert()"/>
Friday<br>
<label>
<br> Total
<input value="$0.00" readonly type="text" id="total" />
</label>
<input type="submit" value="Order">
</form>
</div>
</div>
https://jsfiddle.net/u0y7aoct/2/
When I check the top 5 boxes they add the price in the total box. However if I check any of the below 5 boxes (desserts) the price overwrites. I need the total price showing, but right now they are acting as two different.

Try this updated fiddle
Basically, create a common method which does the total of both
window.totalAll = function()
{
document.getElementById("total").value = (totalIt() + totalPrisDessert()).toFixed(2) ;
}

You dont need to call two different function you can add both values by calling same function and just need to check a condtion whether is it product or dessert.
var grndTotal = 0;
var total1 = 0;
var total2 = 0;
window.totalIt= function(name) {
if(name == "product"){
var input = document.getElementsByName("product");
var total = 0;
for (var i = 0; i < input.length; i++) {
if (input[i].checked) {
total += 1;
}
}
if(total>=3){ total1 = (total*29).toFixed(2);}
else{total1 = (total*39).toFixed(2);}
}
if(name == "dessert"){
var input = document.getElementsByName("dessert");
var total = 0;
for (var i = 0; i < input.length; i++) {
if (input[i].checked) {
total += parseFloat(input[i].value);
}
}
total2 = total.toFixed(2);
}
grndTotal = parseInt(total2) + parseInt(total1);
document.getElementById("total").value = "$"+grndTotal ;
}
This is the updated function that work correctly.
https://jsfiddle.net/VijayDhanvai/hd103j4a/

It's just because you programmed it like this. You made two different function for every one of the case and these functions act separately. What did you expect? :)
You need more something like this:
window.totalIt = function() {
var input = document.getElementsByName("product");
var total = 0;
var count = 0;
for (var i = 0; i < input.length; i++) {
if (input[i].checked) {
count += 1;
}
}
if(count >= 3){
total = count * 29;
} else {
total = count * 39;
}
return total;
}
window.totalPrisDessert = function() {
var input = document.getElementsByName("dessert");
var total = 0;
for (var i = 0; i < input.length; i++) {
if (input[i].checked) {
total += parseFloat(input[i].value);
}
}
return total;
}
window.grandTotal = function() {
var total = totalIt() + totalPrisDessert();
document.getElementById("total").value = "$" + total.toFixed(2);
}
Of course, use the new function grandTotal() in your html.

getting Numerical Value from Radio button using JavaScript code

Why this code is not returning the value.When I click Calculate, it does not work.

Comparison is ==
Assignment is =.
You need ageNumerical = 0;
Check out this fiddle.
Here is the snippet.
function getValue() {
var a = patientAge();
var b = patientBmi();
var c = history();
var d = patientDiet();
var totalValue;
totalValue = a + b + c + d;
document.getElementById('message').innerHTML = totalValue;
}
function patientAge() {
var age = document.getElementsByName('ageRange');
var ageBracket;
var ageNumerical;
for (var i = 0; i < age.length; i++) {
if (age[i].checked) {
ageBracket = age[i].value;
}
}
if (ageBracket == "1-25") {
ageNumerical = 0;
} else if (ageBracket == "26-40") {
ageNumerical = 5;
} else if (ageBracket == "41-60") {
ageNumerical = 8;
} else {
ageNumerical = 10;
}
return ageNumerical;
}
function patientBmi() {
var bmi = document.getElementsByName('bmiRange');
var bmiValue;
var bmiNumerical;
for (var i = 0; i < bmi.length; i++) {
if (bmi[i].checked) {
bmiValue = bmi[i].value;
}
}
if (bmiValue == "0-25") {
bmiNumerical = 0;
} else if (bmiValue == "26-30") {
bmiNumerical = 0;
} else if (bmiValue == "31-35") {
bmiNumerical = 9;
} else {
bmiNumerical = 10;
}
return bmiNumerical;
}
function history() {
var patientHistory = document.getElementsByName('familyHistory');
var historyAnswer;
var historyNumerical;
for (var i = 0; i < patientHistory.length; i++) {
if (patientHistory[i].checked) {
historyAnswer = patientHistory[i].value;
}
}
if (historyAnswer == "No") {
historyNumerical = 0;
} else if (historyAnswer == "Grandparent") {
historyNumerical = 7;
} else if (historyAnswer == "Sibling") {
historyNumerical = 15;
} else {
historyNumerical = 15;
}
return historyNumerical;
}
function patientDiet() {
var dietQuestion = document.getElementsByName('dietHabits');
var dietAnswer;
var dietNumerical;
for (var i = 0; i < dietQuestion.length; i++) {
if (dietQuestion[i].checked) {
dietAnswer = dietQuestion[i].value;
}
}
if (dietAnswer == "Low sugar") {
dietNumerical = 0;
} else if (dietAnswer == "Normal sugar") {
dietNumerical = 0;
} else if (dietAnswer == "Quite high sugar") {
dietNumerical = 7;
} else {
dietNumerical = 10;
}
return dietNumerical;
}
<div id="ageQuestion">
<p>How old are you?</p>
<label for="age1">1-25</label>
<input type="radio" name="ageRange" value="1-25" />
<label for="age2">26-40</label>
<input type="radio" name="ageRange" value="26-40" />
<label for="age3">41-60</label>
<input type="radio" name="ageRange" value="41-60" />
<label for="age4">60+</label>
<input type="radio" name="ageRange" value="60+" />
</div>
<div id="bmi">
<p>What is your BMI?</p>
<label for="bmiLevel">0-25</label>
<input type="radio" name="bmiRange" value="0-25" />
<label for="bmiLevel">26-30</label>
<input type="radio" name="bmiRange" value="26-30" />
<label for="bmiLevel">31-35</label>
<input type="radio" name="bmiRange" value="31-35" />
<label for="bmiLevel">35+</label>
<input type="radio" name="bmiRange" value="35+" />
</div>
<div id="family">
<p>Does anybody in your family have Diabetes?</p>
<label for="history">No</label>
<input type="radio" name="familyHistory" value="No" />
<label for="history">Grandparent</label>
<input type="radio" name="familyHistory" value="Grandparent" />
<label for="history">Sibling</label>
<input type="radio" name="familyHistory" value="Sibling" />
<label for="history">Parent</label>
<input type="radio" name="familyHistory" value="Parent" />
</div>
<div id="diet">
<p>How would you describe your diet?</p>
<label for="diet">Low sugar</label>
<input type="radio" name="dietHabits" value="Low sugar" />
<label for="diet">Normal sugar</label>
<input type="radio" name="dietHabits" value="Normal sugar" />
<label for="diet">Quite high sugar</label>
<input type="radio" name="dietHabits" value="Quite high sugar" />
<label for="diet">High sugar</label>
<input type="radio" name="dietHabits" value="High sugar" />
</div>
<button onclick="getValue()">Calculate</button>
<p id="message"></p>

Change == to = when assigning values.
ageNumerical == 0;
to
ageNumerical = 0;

Javascript function not outputting into html

I'm very new to Javascript and Jquery and am attempting to use this script externally to calculate the value of a users selections (Radio buttons and Checkboxes) and then output the value of the function into my HTML page (id cost) by pressing a button (id submit). This is what I have so far, I would be very appreciative if someone could help me understand why it isn't working.
function add() {
var val1 = 0;
for (i = 0; i < document.form1."radio-choice-v-1"; i++)
{
if (document.form1."radio-choice-v-1"[i].checked === true)
{
val1 = document.form1."radio-choice-v-1"[i].value;
}
}
var val2 = 0;
for (i = 0; i < document.form2."radio-choice-v-2"; i++)
{
if (document.form2.radio-"choice-v-2"[i].checked === true)
{
val2 = document.form2."radio-choice-v-2"[i].value;
}
}
var val3 = 0;
for (i = 0; i < document.form3."radio-choice-v-3"; i++)
{
if (document.form3."radio-choice-v-3"[i].checked === true)
{
val3 = document."form3.radio-choice-v-3"[i].value;
}
}
var val4 = 0;
for (i = 0; i < document.form4."radio-choice-v-4"; i++)
{
if (document.form4."radio-choice-v-4"[i].checked === true)
{
val4 = document.form4."radio-choice-v-4"[i].value;
}
}
var val5 = 0;
for (i = 0; i < document.form5."radio-choice-v-5"; i++)
{
if (document.form5."radio-choice-v-5"[i].checked === true)
{
val5 = document.form5."radio-choice-v-5"[i].value;
}
}
var val6 = 0;
for( i = 0; i < document.form6."checkselection"; i++ )
{
val6 = document.form6."checkselection"[i].value;
}
$("cost").html(" = " + (val1 + val2 + val3 + val4 + val5 + val6));
}
<form name="form1" id="form1">
<fieldset data-role="controlgroup">
<legend>Please select a case:</legend>
<input id="radio-choice-v-1a" name="radio-choice-v-1" value="40" CHECKED="checked" type="radio">
<label for="radio-choice-v-1a">Choice 1 (£40)</label>
<input id="radio-choice-v-1b" name="radio-choice-v-1" value="45" type="radio">
<label for="radio-choice-v-1b">Choice 2 (£45)</label>
<input id="radio-choice-v-1c" name="radio-choice-v-1" value="140" type="radio">
<label for="radio-choice-v-1c">Choice 3 (£140)</label>
</fieldset>
</form>
<form name="form6" id="form6">
<fieldset data-role="controlgroup">
<legend>Select your extras</legend>
<input type="Checkbox" name="checkselection" id="checkbox-extra-1" value="20">
<label for="checkbox-extra-1"> Selection 1 (£20) (recommended)</label>
<input type="Checkbox" name="checkselection" id="checkbox-extra-2" value="12">
<label for="checkbox-extra-2">Selection 2 (£12)</label>
<input type="Checkbox" name="checkselection" id="checkbox-extra-3" value="4">
<label for="checkbox-extra-3">Selection 3 (£4)</label>
<input type="Checkbox" name="checkselection" id="checkbox-extra-4" value="30">
<label for="checkbox-extra-4">Selection 4 (£30)</label>
</fieldset>
</form>
<form>
<input id="submit" type="button" value="Submit" onclick="add();">
</form>
£<u id="cost"></u>

There where quite a few problems with your code. Please have a look at the working example I created on JSFiddle for you:
http://jsfiddle.net/95SrV/1/
I had to comment out the val2+ because you did not have those other forms in the sample HTML you provided:
Pure JavaScript
var val1 = 0;
for (i = 0; i < document.form1["radio-choice-v-1"].length; i++) {
if (document.form1["radio-choice-v-1"][i].checked === true) {
val1 = document.form1["radio-choice-v-1"][i].value;
}
}
However, if you do want to full use jQuery you could use the following code instead:
Full jQuery
var val1 = 0;
$('[name="radio-choice-v-1"]').each(function() {
currentItem = $(this);
if (currentItem.is(":checked")) {
val1 = currentItem.val();
}
});

Try with this one. Make sure all elements will be available like "radio-choice-v-2".
function add() {
var val1 = 0;
for (var i = 0; i < document.form1["radio-choice-v-1"].length; i++)
{
if (document.form1["radio-choice-v-1"][i].checked === true)
{
val1 = document.form1["radio-choice-v-1"][i].value;
}
}
var val2 = 0;
for (i = 0; i < document.form2["radio-choice-v-2"].length; i++)
{
if (document.form2["radio-choice-v-2"][i].checked === true)
{
val2 = document.form2["radio-choice-v-2"][i].value;
}
}
var val3 = 0;
for (i = 0; i < document.form3["radio-choice-v-3"].length; i++)
{
if (document.form3["radio-choice-v-3"][i].checked === true)
{
val3 = document.form3["form3.radio-choice-v-3"][i].value;
}
}
var val4 = 0;
for (i = 0; i < document.form4["radio-choice-v-4"].length; i++)
{
if (document.form4["radio-choice-v-4"][i].checked === true)
{
val4 = document.form4["radio-choice-v-4"][i].value;
}
}
var val5 = 0;
for (i = 0; i < document.form5["radio-choice-v-5"].length; i++)
{
if (document.form5["radio-choice-v-5"][i].checked === true)
{
val5 = document.form5["radio-choice-v-5"][i].value;
}
}
var val6 = 0;
for( i = 0; i < document.form6["checkselection"].length; i++ )
{
if (document.form6["checkselection"][i].checked === true) //Are you missing check here
val6 += document.form6["checkselection"][i].value; // += added here
}
$("#cost").html(" = " + (val1 + val2 + val3 + val4 + val5 + val6));
}
</script>
<form name="form1" id="form1">
<fieldset data-role="controlgroup">
<legend>Please select a case:</legend>
<input id="radio-choice-v-1a" name="radio-choice-v-1" value="40" CHECKED="checked" type="radio">
<label for="radio-choice-v-1a">Choice 1 (£40)</label>
<input id="radio-choice-v-1b" name="radio-choice-v-1" value="45" type="radio">
<label for="radio-choice-v-1b">Choice 2 (£45)</label>
<input id="radio-choice-v-1c" name="radio-choice-v-1" value="140" type="radio">
<label for="radio-choice-v-1c">Choice 3 (£140)</label>
</fieldset>
</form>
<form name="form6" id="form6">
<fieldset data-role="controlgroup">
<legend>Select your extras</legend>
<input type="Checkbox" name="checkselection" id="checkbox-extra-1" value="20">
<label for="checkbox-extra-1"> Selection 1 (£20) (recommended)</label>
<input type="Checkbox" name="checkselection" id="checkbox-extra-2" value="12">
<label for="checkbox-extra-2">Selection 2 (£12)</label>
<input type="Checkbox" name="checkselection" id="checkbox-extra-3" value="4">
<label for="checkbox-extra-3">Selection 3 (£4)</label>
<input type="Checkbox" name="checkselection" id="checkbox-extra-4" value="30">
<label for="checkbox-extra-4">Selection 4 (£30)</label>
</fieldset>
</form>
<form>
<input id="submit" type="button" value="Submit" onclick="add();">
</form>
£<u id="cost"></u>

auto search with checkbox inside textbox from databases

I can able to load value from databases to text-box...so now named as auto..from this i want to create a auto search with multiple check box to select multiple value in text-box java script...its possible ...??
<form name="form1">
<input type="checkbox" name="checkboxname" value="a">
<input type="checkbox" name="checkboxname" value="b">
<input type="checkbox" name="checkboxname" value="c">
</form>
<form name="form2">
<input type="text" name="textname">
</form>
var textbox = document.getElementsByName("textname")[0];
var checkboxes = document.getElementsByName("checkboxname");
for (var i = 0; i < checkboxes.length; i++) {
var checkbox = checkboxes[i];
checkbox.onclick = (function(chk){
return function() {
var value = "";
for (var j = 0; j < checkboxes.length; j++) {
if (checkboxes[j].checked) {
if (value === "") {
value += checkboxes[j].value;
} else {
value += "," + checkboxes[j].value;
}
}
}
textbox.value = value;
}
})(checkbox);
}

Try this,
<form name="form1" class="form_chk">
<input type="checkbox" name="checkboxname" value="a" class="chk_box">a
<input type="checkbox" name="checkboxname" value="b" class="chk_box">b
<input type="checkbox" name="checkboxname" value="c" class="chk_box">c
</form>
$( "#txt_search" ).blur(function(e) {
var $search = $(e.currentTarget),
search_str = $search.val().toLowerCase(), $chk,
$chk_ele = $('.chk_box').filter(function(index, chk){
if($(chk).val().toLowerCase().search(search_str) !== -1){
return $(chk);
}
});
$('.chk_box').prop('checked', false);
$chk_ele.prop('checked', true);
});
See the output : http://jsfiddle.net/J7dUz/