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JS | How to restrict the number of resource available in the booking widget

When an user books a resource (such as a car rental, a seat in a classroom, or a night in a B&B), the widget offers to select how many resources should be booked up to the maximum number of resources available. Should you prefer to restrict this maximum value a fixed amount (eg: 5 for instance), here is a short JavaScript to do so:

$(window).load(function () {
        setTimeout(function() { 
        }, 500); 

function setListener() {           
    for (i = 0; i < document.getElementById("rcount").options.length; i++) {
        if (document.getElementById("rcount").options[i].value > 5) {
            document.getElementById("rcount").options[i].disabled = true;

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