whoogle-search/app/static/js/header.js

document.addEventListener("DOMContentLoaded", () => {
    const advSearchToggle = document.getElementById("adv-search-toggle");
    const advSearchDiv = document.getElementById("adv-search-div");
    const searchBar = document.getElementById("search-bar");
    const countrySelect = document.getElementById("result-country");
    const timePeriodSelect = document.getElementById("result-time-period");
    const arrowKeys = [37, 38, 39, 40];
    let searchValue = searchBar.value;

    countrySelect.onchange = () => {
        let str = window.location.href;
        n = str.lastIndexOf("/search");
        if (n > 0) {
            str = str.substring(0, n) + `/search?q=${searchBar.value}`;
            str = tackOnParams(str);
            window.location.href = str;
        }
    }

    timePeriodSelect.onchange = () => {
        let str = window.location.href;
        n = str.lastIndexOf("/search");
        if (n > 0) {
            str = str.substring(0, n) + `/search?q=${searchBar.value}`;
            str = tackOnParams(str);
            window.location.href = str;
        }
    }

    function tackOnParams(str) {
        if (timePeriodSelect.value != "") {
            str = str + `&tbs=${timePeriodSelect.value}`;
        }
        if (countrySelect.value != "") {
            str = str + `&country=${countrySelect.value}`;
        }
        return str;
    }

    const toggleAdvancedSearch = on => {
        if (on) {
            advSearchDiv.style.maxHeight = "70px";
        } else {
            advSearchDiv.style.maxHeight = "0px";
        }
        localStorage.advSearchToggled = on;
    }

    try {
        toggleAdvancedSearch(JSON.parse(localStorage.advSearchToggled));
    } catch (error) {
        console.warn("Did not recover advanced search toggle state");
    }

    advSearchToggle.onclick = () => {
        toggleAdvancedSearch(advSearchToggle.checked);
    }

    searchBar.addEventListener("keyup", function(event) {
        if (event.keyCode === 13) {
            document.getElementById("search-form").submit();
        } else if (searchBar.value !== searchValue && !arrowKeys.includes(event.keyCode)) {
            searchValue = searchBar.value;
            handleUserInput();
        }
    });
});