问如何检测事件侦听器及其在输入字段中的操作

EN

function getUrlVars() {
    var vars = {};
    var parts = window.location.href.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(m,key,value) {
        vars[key] = value;
    });
    return vars;
}

function valueOutput(element) {
    element.dispatchEvent(new Event('input'));
}

jQuery(function() {
    jQuery(document).on('change', 'input', function(e) {
        valueOutput(e.target);
    });

    // you may want to perform more validations here if needed
    // just checking here if email is present (but not checking for valid email address)
    var fname = getUrlVars()["first"];
    var lname = getUrlVars()["last"];
    var email = getUrlVars()["email"];
    var phone = getUrlVars()["phone"];
    var custom1 = getUrlVars()["custom1"];  // you know this field label is Order Number

    if (email.length > 0) {
        // run an interval until the elements are present on the page (form displayed)
        var checkInputs = setInterval(function() {
            if (jQuery('.amelia-app-booking label[for="customer.email"]').length > 0) {
                var em = jQuery('.amelia-app-booking label[for="customer.email"]').closest('.el-form-item').find('.el-input__inner');

                // this checks to see if an Amelia customer is already present
                if (em.val() == '') {
                    em.prop('value', email).val(email).trigger('change');
                    jQuery('.amelia-app-booking label[for="customer.firstName"]').closest('.el-form-item').find('.el-input__inner').prop('value', fname).val(fname).trigger('change');
                    jQuery('.amelia-app-booking label[for="customer.lastName"]').closest('.el-form-item').find('.el-input__inner').prop('value', lame).val(lame).trigger('change');
                    jQuery('.amelia-app-booking label[for="customer.phone"]').closest('.el-form-item').find('.el-input-group__prepend').siblings('.el-input__inner').prop('value', phone).val(phone).trigger('change');
                }
                // for custom fields I check the label text to find the correct input
                if (custom1 != '') {
                    jQuery('.amelia-app-booking label:contains("Order Number")').closest('.el-form-item').find('.el-input__inner').prop('value', custom1).val(custom1).trigger('change');
                }
                // form info is updated so clear the interval
                clearInterval(checkInputs);
            }
        }, 500);
    }
});