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JavaScript Local Storage Project

Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,253 Points

Localstorage not saving searches

Hi all,

I've followed this great workshop and filled in the functions with the right code but the searches are not being saved into localStorage. I might be able to work out why only no errors are actually showing up on the console.

Any ideas from JS experts out there? :)

<!DOCTYPE html>
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Search Bar Demo</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="stylesheets/page.css" />
  <link href='https://fonts.googleapis.com/css?family=Bitter:400,700' rel='stylesheet' type='text/css'>

  <div class="header">
    <h1 class="header-title">Search</h1>
    <form autocomplete="off" id="searchForm">
      <input class="text-input" type="text" id="searchBar">
      <button class="button" type="submit">Search</button>

  <div class="recent">
    <h2 class="recent-title">Recent Searches</h2>
    <button class="button" type="button" id="clearStorage">Clear Storage</button>
    <ul class="recent-list" id="recentSearchList"></ul>

  <script type="text/javascript">
    'use strict';
    function supportsLocalStorage() {
        try {
            return 'localStorage' in window && window['localStorage'] !== null;
        } catch(e) {
          return false;


    function getRecentSearches() {
        var searches = localStorage.getItem('recentSearches');
        if(searches) {
            return JSON.parse(searches);
        } else {
            return [];

    function saveSearchString() {
        var searches = getRecentSearches();
        if(!str || searches.indexOf(str) > -1) {
            return false;

        localStorage.setItem('recentSearches', JSON.stringify(searches));
        return true;


    function removeSearches() {


    // Create an li, given string contents, append to the supplied ul
    function appendListItem(listElement, string) {
      var listItemElement = document.createElement('LI');
      listItemElement.innerHTML = string;

    // Empty the contents of an element (ul)
    function clearList(listElement) {
      listElement.innerHTML = '';

    window.onload = function() {

    if(localStorage) {
      var searchForm = document.getElementById('searchForm');
      var searchBar = document.getElementById('searchBar');
      var recentSearchList = document.getElementById('recentSearchList');
      var clearButton = document.getElementById('clearStorage');

      // Initialize display list
      var recentSearches = getRecentSearches();
      recentSearches.forEach(function(searchString) {

      // Set event handlers
      searchForm.addEventListener('submit', function(event) {
        var searchString = searchBar.value;
        if (saveSearchString(searchString)) {
          appendListItem(recentSearchList, searchString);

      clearButton.addEventListener('click', function(event) {

2 Answers

if(!str || searches.indexOf(str) > -1) {
    return false;

What is str referring to? It is undefined in this context. I assume you are meaning to pass this value in to the function, judging on how you used the function.


Try this.

function saveSearchString(str) {
    var searches = getRecentSearches();
    if(!str || searches.indexOf(str) > -1) {
        return false;
Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,253 Points

Fabulous! Got it working. I'd forgotten to add the variable as a parameter to the function. :-)

Craig Curtis
Craig Curtis
19,985 Points

Had a similar problem, but window also reloaded.

So at the top of the submit event listener, I added: event.preventDefault()