I have a number of html checkboxes that I am trying to count like this...
jQuery('.mycheckboxes').change(function() {
var count = jQuery('.mycheckboxes:checked').length;
console.log(count);
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="checkbox" class="mycheckboxes" data-section="1" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="1" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="1" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="1" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="2" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="2" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="2" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="2" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="3" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="3" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="3" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="3" name="mycheckboxes">This is working correctly, but I want to create something like an array which will group the count of clicked checkboxes by the data-section attribute, so my output would look something like...
{
data-section-1 : 4,
data-section-2 : 3,
data-section-3 : 1,
};
What is my best approach, I am more used to using PHP so would be trying to create an array, but should I be using an object instead?
This is vanilla JavaScript, but should work for you:
let finalArray = [0,0,0];
const dataSections1 = document.querySelectorAll("[data-section='1']");
const dataSections2 = document.querySelectorAll("[data-section='2']");
const dataSections3 = document.querySelectorAll("[data-section='3']");
dataSections1.forEach((function(item) {
if (item.checked) {
finalArray[0]++;
}
});
dataSections2.forEach((function(item) {
if (item.checked) {
finalArray[1]++;
}
});
dataSections3.forEach((function(item) {
if (item.checked) {
finalArray[2]++;
}
});
Don't need jquery (stay away from the bloatware). Simply create an object and use section attribute value as it's keys:
const count = {};
for(let i = 0, list = document.querySelectorAll(".mycheckboxes"); i < list.length; i++)
{
count[list[i].dataset.section] = 0; //set initial values for each section
list[i].addEventListener("change", onChange);
}
function onChange(e)
{
count[e.target.dataset.section] += e.target.checked ? 1:-1;
console.log(count);
}<input type="checkbox" class="mycheckboxes" data-section="1" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="1" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="1" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="1" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="2" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="2" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="2" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="2" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="3" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="3" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="3" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="3" name="mycheckboxes">Get list of keys, set their value to 0. Create an object from those keys. Then iterate and populate.
$('.mycheckboxes').change(function() {
var items = $('.mycheckboxes:checked').toArray();
let keyvalueArray = items.map(v => (["data-section-" + $(v).attr("data-section"), 0 ]));
let sections = Object.fromEntries([... new Set(keyvalueArray)]);
items.forEach(v => { sections["data-section-" + $(v).attr("data-section")] +=1; })
console.log(sections);
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="checkbox" class="mycheckboxes" data-section="1" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="1" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="1" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="1" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="2" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="2" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="2" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="2" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="3" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="3" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="3" name="mycheckboxes">
<input type="checkbox" class="mycheckboxes" data-section="3" name="mycheckboxes">