Develop Reference

Get the text from label of Radiobutton

I have a couple of radio button below. I want to get the text from the radio button I have chosen. For example: House Espresso or Guest Espresso. I have tried to use getElementsByName and for loop to get the checked value but it seems to return nothing.
Here is my HTML code:
<div class="type">
<p>Type<p>
<input type="radio" id="houseEspresso" name="singleEspresso" checked="checked"onclick="addProduct(this)">
<label for="houseEspresso">House Espresso</label><br>
<input type="radio" id="guestEspresso" name="singleEspresso" onclick="addProduct(this)">
<label for="guestEspresso">Guest Espresso</label><br>
</div>
And here is my Javascript code:
var type = document.getElementsByName("singleEspresso")
for (var i=0; i<type.length; i++){
if(type[i].checked){
var title_type=type[i].innerText
console.log(title_type)
}
}
Can anyone give me an idea to fix it? Thank you!

The problem is that you're trying to get innerText from the <input>, which has none. You need to get the <label>'s text:
for (var i=0; i<type.length; i++){
if(type[i].checked){
var title_type=type[i].nextElementSibling.innerText
console.log(title_type)
}
}

You need to find a checked input, for that you can use :checked css selector. Then you can pick any value from input DOM element which ties it to label (in your case it's id). And basing on the id you can find corresponding label.
const selectedRadioInput = document.querySelector('[name=singleEspresso]:checked');
const inputId = selectedRadioInput.id;
const label = document.querySelector(`[for=${inputId}]`);
console.log(label.innerText);
Working demo: https://jsfiddle.net/yo18mx9k/2/

You can set a value to input radio: <input type="radio" value="1">
Then just get the buttons and see which one is checked, like this:
let house = document.getElementById('houseEspresso');
let guest = document.getElementById('guestEspresso');
if (house.checked) {
console.log(house.value);
} else if (guest.checked) {
console.log(guest.value);
}
However, I would recommend that you take a look at jQuery so you can make it easier:
$("input[name='singleEspresso']:checked").val();

How do I retrieve values from checkboxes in JavaScript, using onchange to trigger a function?

I'm a High School student who takes a programming course (JavaScript) at school. We just had a test (which I miserably failed), but we are allowed to try again.
I have a couple of checkboxes. They all have an onchange which triggers a function later. I want to retrieve their values when I click on the checkboxes.
I've browsed around here a bit and seen something called jQuery. I have no idea what that is, so I would highly appreciate to get my help in pure JavaScript.
Okay, here is what I have of code. Note: Some variables and such are in Norwegian. I don't think it should be a problem, since I show the references to all.
My inputs (checkboxes):
<input type="checkbox" class="tur" value="0" onchange="funcSjekkBoks(this)">
<input type="checkbox" class="tur" value="1" onchange="funcSjekkBoks(this)">
<input type="checkbox" class="tur" value="2" onchange="funcSjekkBoks(this)">
<input type="checkbox" class="tur" value="3" onchange="funcSjekkBoks(this)">
<input type="checkbox" class="tur" value="4" onchange="funcSjekkBoks(this)">
I only need their value to be numbers, since I will use those in reference to an array list I have later.
Here is my function:
var inputTur = document.getElementsByClassName("tur");
console.log(inputTur);
function funcSjekkBoks(checkboxEl) {
var resultatListe = [];
if (checkboxEl.checked) {
resultatListe.push(inputTur.value);
console.log(resultatListe);
}
else {
console.log("usant")
}
}
What I would like to happen (if all checkboxes are checked from top to bottom):
resultatListe = [0, 1, 2, 3, 4]
When I uncheck a checkbox, it's value will be removed from the array.
Here is what currently happens:
When I check a checkbox I get [undefined] in my console, when I uncheck a checkbox I get usant (although that is the expected response, I haven't worked with the else part of my if-sentence yet.)

Below code will work for you:
var resultatListe = [];
function funcSjekkBoks(checkboxEl) {
var value = parseInt(checkboxEl.value);
if (checkboxEl.checked) {
resultatListe.push(value);
console.log(resultatListe);
}
else {
console.log("usant");
var indexToRemove = resultatListe.indexOf(value);
resultatListe.splice(indexToRemove,1);
}
}
You need to keep the array resultatListe outside the function other it will be initialized to empty everytime a checkbox is checked/un-checked, triggering the onchange handler. You were getting undefined as you were accessing 'value' property on HTMLCollection object which does not contain that property. Read more about it on MDN

var inputTur = document.getElementsByClassName("tur");
var resultatListe = [];
console.log(inputTur);
function funcSjekkBoks(checkboxEl) {
if (checkboxEl.checked) {
resultatListe.push(parseInt(checkboxEl.value));
}
else {
resultatListe = resultatListe.filter(d => d != checkboxEl.value)
}
console.log(resultatListe);
}
There were 2 mistakes in your logic:
1) You need to define resultatListe outside the function so that it won't get initialized to an empty array everytime
2) In you code resultatListe.push(inputTur.value); inputTur is the HTMLCollection of checkboxes whereas you need the single checkbox.
For the else logic, if the value of each checkbox is going to be unique you can use array.prototype.filter method to filter out the value of checkbox from resultatListe

Sending Checkbox and Text Input Values to URL String with Javascript

I have a list of products, each individual product has a checkbox value with the products id e.g. "321". When the products checkbox is checked (can be more than 1 selected) i require the value to be collected. Each product will also have a input text field for defining the Qty e.g "23" and i also require this Qty value to be collected. The Qty text input should only be collected if the checkbox is checked and the qty text value is greater than 1. The plan is to collect all these objects, put them in to a loop and finally turn them in to a string where i can then display the results.
So far i have managed to collect the checkbox values and put these into a string but i'm not sure how to collect the additional text Qty input values without breaking it. My understanding is that document.getElementsByTagName('input') is capable of collecting both input types as its basically looking for input tags, so i just need to work out how to collect and loop through both the checkboxes and the text inputs.
It was suggested that i use 2 if statements to accomplish this but i'm new to learning javascript so i'm not entirely sure how to go about it. I did try adding the if statement directly below the first (like you would in php) but this just seemed to break it completely so i assume that is wrong.
Here is my working code so far that collects the checkbox values and puts them in a string. If you select the checkbox and press the button the values are returned as a string. Please note nothing is currently appended to qty= because i dont know how to collect and loop the text input (this is what i need help with).
How can i collect the additional qty input value and append this number to qty=
// function will loop through all input tags and create
// url string from checked checkboxes
function checkbox_test() {
var counter = 0, // counter for checked checkboxes
i = 0, // loop variable
url = '/urlcheckout/add?product=', // final url string
// get a collection of objects with the specified 'input' TAGNAME
input_obj = document.getElementsByTagName('input');
// loop through all collected objects
for (i = 0; i < input_obj.length; i++) {
// if input object is checkbox and checkbox is checked then ...
if (input_obj[i].type === 'checkbox' && input_obj[i].checked) {
// ... increase counter and concatenate checkbox value to the url string
counter++;
url = url + input_obj[i].value + '&qty=' + '|';
}
}
// display url string or message if there is no checked checkboxes
if (counter > 0) {
// remove first "&" from the generated url string
url = url.substr(1);
// display final url string
alert(url);
}
else {
alert('There is no checked checkbox');
}
}
<ul>
<li>
<form>
<input type="checkbox" id="checked-product" name="checked-product" value="311">Add To Cart
<div class="quantity">
<input type="text" name="qty" id="qty" maxlength="12" value="1" class="input-text qty"/>
</div>
</form>
</li>
<li>
<form>
<input type="checkbox" id="checked-product" name="checked-product" value="321">Add To Cart
<div class="quantity">
<input type="text" name="qty" id="qty" maxlength="12" value="10" class="input-text qty"/>
</div>
</form>
</li>
<li>
<form>
<input type="checkbox" id="checked-product" name="checked-product" value="98">Add To Cart
<div class="quantity">
<input type="text" name="qty" id="qty" maxlength="12" value="5" class="input-text qty"/>
</div>
</form>
</li>
</ul>
<button type="button" onclick="javascript:checkbox_test()">Add selected to cart</button>

My answer has two parts: Part 1 is a fairly direct answer to your question, and Part 2 is a recommendation for a better way to do this that's maybe more robust and reliable.
Part 1 - Fairly Direct Answer
Instead of a second if to check for the text inputs, you can use a switch, like so:
var boxWasChecked = false;
// loop through all collected objects
for (i = 0; i < input_obj.length; i++) {
// if input object is checkbox and checkbox is checked then ...
switch(input_obj[i].type) {
case 'checkbox':
if (input_obj[i].checked) {
// ... increase counter and concatenate checkbox value to the url string
counter++;
boxWasChecked = true;
url = url + input_obj[i].value + ',qty=';
} else {
boxWasChecked = false;
}
break;
case 'text':
if (boxWasChecked) {
url = url + input_obj[i].value + '|';
boxWasChecked = false;
}
break;
}
}
Here's a fiddle showing it working that way.
Note that I added variable boxWasChecked so you know whether a Qty textbox's corresponding checkbox has been checked.
Also, I wasn't sure exactly how you wanted the final query string formatted, so I set it up as one parameter named product whose value is a pipe- and comma-separated string that you can parse to extract the values. So the url will look like this:
urlcheckout/add?product=321,qty=10|98,qty=5
That seemed better than having a bunch of parameters with the same names, although you can tweak the string building code as you see fit, obviously.
Part 2 - Recommendation for Better Way
All of that isn't a great way to do this, though, as it's highly dependent on the element positions in the DOM, so adding elements or moving them around could break things. A more robust way would be to establish a definitive link between each checkbox and its corresponding Qty textbox--for example, adding an attribute like data-product-id to each Qty textbox and setting its value to the corresponding checkbox's value.
Here's a fiddle showing that more robust way.
You'll see in there that I used getElementsByName() rather than getElementsByTagName(), using the name attributes that you had already included on the inputs:
checkboxes = document.getElementsByName('checked-product'),
qtyBoxes = document.getElementsByName('qty'),
First, I gather the checkboxes and use an object to keep track of which ones have been checked:
var checkedBoxes = {};
// loop through the checkboxes and find the checked ones
for (i = 0; i < checkboxes.length; i++) {
if (checkboxes[i].checked) {
counter++;
checkedBoxes[checkboxes[i].value] = 1; // update later w/ real qty
}
}
Then I gather the Qty textboxes and, using the value of each one's data-product-id attribute (which I had to add to the markup), determine if its checkbox is checked:
// now get the entered Qtys for each checked box
for (i = 0; i < qtyBoxes.length; i++) {
pid = qtyBoxes[i].getAttribute('data-product-id');
if (checkedBoxes.hasOwnProperty(pid)) {
checkedBoxes[pid] = qtyBoxes[i].value;
}
}
Finally, I build the url using the checkedBoxes object:
// now build our url
Object.keys(checkedBoxes).forEach(function(k) {
url += [
k,
',qty=',
checkedBoxes[k],
'|'
].join('');
});
(Note that this way does not preserve the order of the items, though, so if your query string needs to list the items in the order in which they're displayed on the page, you'll need to use an array rather than an object.)
There are lots of ways to achieve what you're trying to do. Your original way will work, but hopefully this alternative way gives you an idea of how you might be able to achieve it more cleanly and reliably.

Check the below simplified version.
document.querySelector("#submitOrder").addEventListener('click', function(){
var checkStatus = document.querySelectorAll('#basket li'),
urls = [];
Array.prototype.forEach.call(checkStatus, function(item){
var details = item.childNodes,
urlTemplate = '/urlcheckout/add?product=',
url = urlTemplate += details[0].value + '&qty=' + details[1].value;
urls.push(url)
});
console.log(urls);
})
ul{ margin:0; padding:0}
<ul id="basket">
<li class="products"><input type="checkbox" value = "311" name="item"><input type="text"></li>
<li><input type="checkbox" value = "312" name="item"><input type="text"></li>
<li><input type="checkbox" value = "313" name="item"><input type="text"></li>
</ul>
<button id="submitOrder">Submit</button>

Checkbox value returning on

I am trying to determine which checkbox's are checked and if they are checked I want to have a string of all the checked options.
function checkedOptions()
{
var checklist = document.getElementById("list");
var checkboxes = checklist.getElementsByTagName("INPUT");
var options;
for(var i = 1; i < checkboxes.length; i++)
{
if(checkboxes[i].checked == true)
options += checkboxes[i].value;
}
return options;
}
This code always returns "on" for every check box. I did read some other posts on this topic but they all use jquery and it is something that I am trying to avoid as my workplace is avoiding it. I am not sure how to get the value of this checkbox.
<ul class="choice" id="checklist">
<li><label id="selection" for="list" onMouseOver="mouseOver()" onMouseOut="mouseOut()">
<input type="checkbox" id="list" checked="true" disabled="true" onChange="checkedOptions()"/>
(None)
</label></li>
</ul>

Your checkbox has no explicit value attribute, so it's using the default value of on.
If you want it to have a specific value, you need to give it one via value="my_value".

For those following the question's TITLE as opposed to the actual question, this might be a quick answer to the problem of checkbox returning ON whether checked or not:
var myVal = ( $('#myCheckbox').is(':checked') ) ? 1 : 0;
alert('myVal is: ' +myVal); //alerts 1 if checked, 0 if not checked
jsFiddle Demo

Naming Lots of Input Checkboxes with a Counter

This is a pretty straightforward question, but I wasn't able to find the answer to it.
Is it possible to do something like this with JavaScript and HTML? So below the names of the checkboxes in order would be 1, 2, 3, 4
<input type="checkbox" name=counter()>
<input type="checkbox" name=counter()>
<input type="checkbox" name=counter()>
<input type="checkbox" name=counter()>
function counter() {
i++;
return i;
}

No, but yes in a different way. Don't include the name attribute (or set the value as ""), and put this code after your checkboxes:
<script type="text/javascript">
var chx = document.getElementsByTagName("input");
for (var i = 0; i < chx.length; i++) {
var cur = chx[i];
if (cur.type === "checkbox") {
cur.name = "checkbox" + i;
}
}
</script>
DEMO: http://jsfiddle.net/bLRLA/
The checkboxes' names will be in the format "checkbox#". This starts counting at 0. If you want to start the names with 1 instead (like you did say), use cur.name = "checkbox" + i + 1;.
Another option for getting the checkboxes is using:
var chx = document.querySelectorAll('input[type="checkbox"]');
With this, you don't have to check the .type inside the for loop.
In either case, it's probably better not to use document, and instead use some more specific container of these elements, so that not all checkboxes are targeted/modified...unless that's exactly what you want.
In the demo, I added extra code so that when you click on the checkbox, it will alert its name, just to prove it's being set properly. That code obviously isn't necessary for what you need....just the code above.
This code could be run immediately after the checkboxes, at the end of the <body>, or in window.onload.

You can get a nodeList of all inputs on the page and then loop through them adding the loop index to whatever the common name string you want for those that have a type of "checkbox". In the following example I have used Array.forEach and Function.call to treat the array like nodeList as an array, to make looping simple.
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
var inputs = document.getElementsByTagName("input");
Array.prototype.forEach.call(inputs, function (input, index) {
if (input.type === "checkbox") {
inputs.name = "box" + index;
}
});
on jsfiddle
Finally, though this has been demonstrated as possible, I think you need to be asking yourself the question "why would I do it this way?". Perhaps there is a better alternative available to you.

Since you're most probably processing the form server-side. you can possibly not bother altering the form markup client-side. For example, simple changing your form markup to the following will do the trick:
<input type="checkbox" value="One" name=counter[]>
<input type="checkbox" value="Two" name=counter[]>
<input type="checkbox" value="Tre" name=counter[]>
<input type="checkbox" value="For" name=counter[]>
Then, for example, using PHP server-side:
<?php
if ( isset( $_REQUEST['counter'] ) ) {
print_r( $_REQUEST['counter'] );
}
?>

I think you're better off creating the elements in code. add a script tag in replace of your controls and use something like this (create a containing div, I've specified one named container in my code below)
for(int i = 0; i < 4; i ++){
var el = document.createElement('input');
el.setAttribute('name', 'chk' + i.toString());
document.getElementById('container').appendChild(el);
}