Source of chkbxrange.js - Zabbix

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        this.checkObjects(object, objectIds, checked);
    },
​
    /**
     * Update the general state after toggling a checkbox.
     *
     * @param {string} object
     */
    update: function(object) {
        // update main checkbox state
        this.updateMainCheckbox();
        this.updateMainCheckbox(object);
​
        if (this.pageGoName == object) {
            this.updateGoButton();
        }
    },
​
    /**
     * Update the state of the "Go" controls.
     */
    updateGoButton: function() {
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​
        jQuery('#action_buttons button').each((_, val) => {
            const $val = jQuery(val);
​
            if (!$val.data('disabled')) {
                $val.prop('disabled', count == 0);
            }
        });
    },
​
    // check if all checkboxes are selected and select main checkbox, else disable checkbox, select options and button
    updateMainCheckbox: function() {
        var mainCheckbox = jQuery('.list-table .header input[type=checkbox]:not(:disabled)');
        if (!mainCheckbox.length) {
    /**
     * Select main checkbox if all other checkboxes are selected.
     *
     * @param {string} object
     */
    updateMainCheckbox: function(object) {
        const checkbox_list = this.getObjectCheckboxes(object);
        const $main_checkbox = $(checkbox_list)
            .parents('table')
            .find('thead input[type=checkbox]');
​
        if ($main_checkbox.length == 0) {
            return;
        }
​
        var countAvailable = jQuery('.list-table tr:not(.header) input[type=checkbox]:not(:disabled)').length;
        const count_available = checkbox_list.length;
​
        if (countAvailable > 0) {
            var countChecked = jQuery('.list-table tr:not(.header) input[type=checkbox]:not(:disabled):checked').length;
        if (count_available > 0) {
            const checked = [];
​
            mainCheckbox = mainCheckbox[0];
            mainCheckbox.checked = (countChecked == countAvailable);
            jQuery.each(checkbox_list, (i, checkbox) => {
                if (checkbox.checked) {
                    checked.push(checkbox);
                }
            });
​
            if (mainCheckbox.checked) {
                jQuery('.list-table .header').addClass('selectedMain');
            }
            else {
                jQuery('.list-table .header').removeClass('selectedMain');
            }
        }
        else {
            mainCheckbox.disabled = true;
            $main_checkbox[0].checked = (checked.length == count_available);
        }
    },
​
    /**
     * Save the state of the checkboxes belonging to the given object group in SessionStorage.
     *
     * @param {string} object
     * @param {Object} selected_ids  key/value pairs of selected ids.
     */
    saveSessionStorage: function(object, selected_ids) {