Function messageHandler

wvbrowser_ui/content_ui/history.js:19–44

});

const messageHandler = event => {
    var message = event.data.message;
    var args = event.data.args;

    switch (message) {
        case commands.MG_GET_HISTORY:
            let entriesContainer = document.getElementById('entries-container');
            if (args.from == 0 && args.items.length) {
                entriesContainer.textContent = '';

                let clearButton = document.getElementById('btn-clear');
                clearButton.classList.remove('hidden');
            }

            loadItems(args.items);
            if (args.items.length == lastRequestSize) {
                document.addEventListener('scroll', requestTrigger);
            } else if (entriesContainer.childElementCount == 0) {
                loadUIForEmptyHistory();
            }
            break;
        default:
            console.log(`Unexpected message: ${JSON.stringify(event.data)}`);
            break;
    }
};

const requestTrigger = function(event) {
    let triggerRange = 50;