Create a Search Experience

Goal: This guide will show you how to add a search input field to your map application, allowing users to find locations within your venue. Search results will be displayed in a list and highlighted on the map.

SDK Concepts Introduced:

Using mapsindoors.services.LocationsService.getLocations() to fetch locations based on a query.
Interacting with the map based on search results:
- Highlighting multiple locations: mapsIndoorsInstance.highlight().
- Setting the floor: mapsIndoorsInstance.setFloor().
- Selecting a specific location: mapsIndoorsInstance.selectLocation().
Clearing previous highlights and selections: mapsIndoorsInstance.highlight() (with no arguments) and mapsIndoorsInstance.deselectLocation().
Getting current venue information: mapsIndoorsInstance.getVenue().

Prerequisites

Completion of Step 1: Display a Map.
Your MapsIndoors API Key and Google Maps JavaScript API Key should be correctly set up as per Step 1. We will continue using the demo API key 02c329e6777d431a88480a09 and venue ID dfea941bb3694e728df92d3d for this example.

The Code

This guide details the modifications to HTML, CSS, and JavaScript needed to add a search input field, display search results, and dynamically interact with the map based on user searches.

Update index.html

Open your index.html file. The primary structural change to your HTML is the introduction of a dedicated search panel. This panel will house the input field where users type their search queries and an unordered list where the corresponding search results will appear.

<!-- index.html -->
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>MapsIndoors</title>
    <link rel="stylesheet" href="style.css">
    <script src="https://maps.googleapis.com/maps/api/js?libraries=geometry&key=YOUR_GOOGLE_MAPS_API_KEY"></script>
    <script src="https://app.mapsindoors.com/mapsindoors/js/sdk/4.41.0/mapsindoors-4.41.0.js.gz"
            integrity="sha384-3lk3cwVPj5MpUyo5T605mB0PMHLLisIhNrSREQsQHjD9EXkHBjz9ETgopmTbfMDc"
            crossorigin="anonymous"></script>
</head>

<body>
    <div id="map"></div>

    <!-- New search panel for user interaction -->
    <div class="panel">
        <div id="search-ui" class="flex-column">
            <!-- Input field for users to type search queries -->
            <input type="text" id="search-input" placeholder="Search for a location...">
            <!-- Unordered list to display search results dynamically -->
            <ul id="search-results"></ul>
        </div>
    </div>

    <script src="script.js"></script>
</body>

</html>

Explanation of index.html updates:

A new div element with the class panel is added. This div serves as the main container for all search-related UI elements.
Inside the panel, another div with the id search-ui and the class flex-column is introduced to arrange the search input and results list vertically.
An <input> element with id="search-input" is the text field for user search queries.
An <ul> (unordered list) element with id="search-results" will be dynamically populated with locations matching the user's query.

Update style.css

Modify your style.css file to incorporate styles for the newly added search panel and its contents. These styles are crucial for ensuring the search interface is user-friendly, visually appealing, and correctly positioned over the map without obstructing it entirely.

/* style.css */

/* Use flexbox for the main layout */
html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden; /* Prevent scrollbars if map is full size */
    display: flex;
    flex-direction: column; /* Stack children vertically if needed later */
}

/* Style for the map container */
#map {
  /* Make map fill available space */
  flex-grow: 1;
  width: 100%; /* Make map fill width */
  margin: 0;
  padding: 0;
}


/* Style for the information panel container */
.panel {
    position: absolute; /* Positions the panel relative to the nearest positioned ancestor (or body if none). This allows it to float over the map. */
    top: 10px; /* Adds a 10px margin from the top edge of its containing element. */
    left: 10px; /* Adds a 10px margin from the left edge of its containing element, placing it in the top-left corner. */
    z-index: 10; /* Ensures the panel appears on top of other elements, like the map itself, which might have lower z-index values. */
    background-color: white; /* Sets a solid white background for the panel, making text readable. */
    padding: 10px; /* Adds 10px of space inside the panel, around its content. */
    border-radius: 5px; /* Rounds the corners of the panel for a softer look. */
    box-shadow: 0 2px 5px rgba(0,0,0,0.2); /* Adds a subtle shadow effect, giving the panel a sense of depth. */
    max-height: 80%; /* Limits max-height to prevent overflow with details */
    overflow-y: auto; /* Adds a vertical scrollbar if the content inside the panel exceeds its max-height. */
    border: 1px solid #ccc; /* Adds a light gray border around the panel for better visual separation. */
    width: 300px; /* Sets a fixed width for the panel. */
}

/* Class to apply flex display and column direction */
.flex-column {
    display: flex; /* Enables flexbox layout for this element. */
    flex-direction: column; /* Arranges child elements in a vertical column. */
    gap: 10px; /* Adds a 10px gap between child elements within the flex container. */
}

/* Class to hide elements */
.hidden {
    display: none; /* Makes elements with this class invisible and removes them from the layout. */
}

/* Style for the search input field */
#search-input {
    padding: 8px; /* Adds 8px of internal padding to the input field for better text spacing. */
    border: 1px solid #ccc; /* Adds a light gray border around the input field. */
    border-radius: 4px; /* Slightly rounds the corners of the input field. */
    font-size: 1rem; /* Sets the font size within the input field to a standard readable size. */
}

/* Style for the search results list */
#search-results {
    list-style: none; /* Removes the default bullet points from the unordered list. */
    padding: 0; /* Removes default padding from the list. */
    margin: 0; /* Removes default margins from the list. */
}

/* Style for individual search result items */
#search-results li {
    padding: 8px 0; /* Adds vertical padding to each list item for spacing. */
    cursor: pointer; /* Changes the mouse cursor to a pointer on hover, indicating the item is clickable. */
    border-bottom: 1px solid #eee; /* Adds a light gray line below each list item, acting as a separator. */
}

/* Style for the last search result item (no bottom border) */
#search-results li:last-child {
    border-bottom: none; /* Removes the bottom border from the last item in the list for a cleaner look. */
}

/* Hover effect for search result items */
#search-results li:hover {
    background-color: #f0f0f0; /* Changes the background color of a list item when hovered, providing visual feedback. */
}

Explanation of style.css updates:

.panel: Styles the search panel to float over the map in the top-left corner, with a white background, padding, rounded corners, and a shadow for a modern look. max-height and overflow-y: auto ensure it's scrollable if results are numerous.
.flex-column: A utility class using Flexbox to stack child elements (search input, results list) vertically with a small gap.
.hidden: A utility class to hide elements (display: none;), used initially for the search results list.
#search-input: Styles the search input field with padding, border, and font size for readability.
#search-results: Styles the unordered list for search results, removing default list styling.
#search-results li: Styles individual list items with padding, a bottom border for separation, and a pointer cursor to indicate clickability.
#search-results li:last-child: Removes the bottom border from the last list item.
#search-results li:hover: Provides a hover effect for list items for better user feedback.

Update script.js

The script.js file sees the most significant changes as it houses the logic for the search functionality.

// script.js

// Define options for the MapsIndoors Google Maps view
const mapViewOptions = {
    element: document.getElementById('map'),
    center: { lng: -97.74204591828197, lat: 30.36022358949809 },
    zoom: 17,
    maxZoom: 22,
};

// Set the MapsIndoors API key
mapsindoors.MapsIndoors.setMapsIndoorsApiKey('YOUR_MAPSINDOORS_API_KEY'); // Replace with your MapsIndoors API key

// Create a new instance of the MapsIndoors Google Maps view
const mapViewInstance = new mapsindoors.mapView.GoogleMapsView(mapViewOptions);

// Create a new MapsIndoors instance, passing the map view
const mapsIndoorsInstance = new mapsindoors.MapsIndoors({
    mapView: mapViewInstance,
    // Set the venue ID to load the map for a specific venue
    venue: 'YOUR_MAPSINDOORS_VENUE_ID', // Replace with your actual venue ID
});

/** Floor Selector **/

// Create a new HTML div element to host the floor selector
const floorSelectorElement = document.createElement('div');

// Create a new FloorSelector instance, linking it to the HTML element and the main MapsIndoors instance.
new mapsindoors.FloorSelector(floorSelectorElement, mapsIndoorsInstance);

// Get the underlying Google Maps instance
const googleMapInstance = mapViewInstance.getMap();

// Add the floor selector HTML element to the Google Maps controls.
googleMapInstance.controls[google.maps.ControlPosition.TOP_RIGHT].push(floorSelectorElement);

/** Handle Location Clicks **/

// Function to handle clicks on MapsIndoors locations
function handleLocationClick(location) {
    if (location && location.id) {
        // Move the map to the selected location
        mapsIndoorsInstance.goTo(location);
        // Ensure that the map shows the correct floor
        mapsIndoorsInstance.setFloor(location.properties.floor);
        // Select the location on the map
        mapsIndoorsInstance.selectLocation(location);
    }
}

// Add an event listener to the MapsIndoors instance for click events on locations
mapsIndoorsInstance.on('click', handleLocationClick);

/** Search Functionality **/

// Get references to the search input and results list elements
const searchInputElement = document.getElementById('search-input');
const searchResultsElement = document.getElementById('search-results');

// Initially hide the search results list
searchResultsElement.classList.add('hidden');

// Add an event listener to the search input for 'input' events
// This calls the onSearch function every time the user types in the input field
searchInputElement.addEventListener('input', onSearch);

// Function to perform the search and update the results list and map highlighting
function onSearch() {
    // Get the current value from the search input
    const query = searchInputElement.value;
    // Get the current venue from the MapsIndoors instance
    const currentVenue = mapsIndoorsInstance.getVenue();

    // Clear map highlighting
    mapsIndoorsInstance.highlight();
    // Deselect any selected location
    mapsIndoorsInstance.deselectLocation();

    // Check if the query is too short (less than 3 characters) or empty
    if (query.length < 3) {
        // Hide the results list if the query is too short or empty
        searchResultsElement.classList.add('hidden');
        return; // Stop here
    }

    // Define search parameters with the current input value
    // Include the current venue name in the search parameters
    const searchParameters = { q: query, venue: currentVenue ? currentVenue.name : undefined };

    // Call the MapsIndoors LocationsService to get locations based on the search query
    mapsindoors.services.LocationsService.getLocations(searchParameters).then(locations => {
        // Clear previous search results
        searchResultsElement.innerHTML = null;

        // If no locations are found, display a "No results found" message
        if (locations.length === 0) {
            const noResultsItem = document.createElement('li');
            noResultsItem.textContent = 'No results found';
            searchResultsElement.appendChild(noResultsItem);
            // Ensure the results list is visible to show the "No results found" message
            searchResultsElement.classList.remove('hidden');
            return; // Stop here if no results
        }

        // Append new search results to the list
        locations.forEach(location => {
            const listElement = document.createElement('li');
            // Display the location name
            listElement.innerHTML = location.properties.name;
            // Store the location ID on the list item for easy access
            listElement.dataset.locationId = location.id;

            // Add a click event listener to each list item
            listElement.addEventListener('click', function () {
                // Call the handleLocationClick function when a location in the search results is clicked.
                handleLocationClick(location);
            });

            searchResultsElement.appendChild(listElement);
        });

        // Show the results list now that it has content
        searchResultsElement.classList.remove('hidden');

        // Filter map to only display search results by highlighting them
        mapsIndoorsInstance.highlight(locations.map(location => location.id));
    })
        .catch(error => {
            console.error("Error fetching locations:", error);
            const errorItem = document.createElement('li');
            errorItem.textContent = 'Error performing search.';
            searchResultsElement.appendChild(errorItem);
            searchResultsElement.classList.remove('hidden');
        });
}

Explanation of script.js updates:

DOM Element References: searchInputElement and searchResultsElement get references to the HTML input field and the unordered list for displaying results, respectively.
Initial State: The searchResultsElement is hidden by default using the .hidden CSS class.
Event Listener: An input event listener is attached to searchInputElement. This calls the onSearch function each time the user types into the search field.
onSearch() Function: This is the core of the search logic:
- It retrieves the current query from the input field and gets the currentVenue using mapsIndoorsInstance.getVenue(). For more details on venue information, see the getVenue() reference.
- It clears any existing highlights from the map using mapsIndoorsInstance.highlight() (called without arguments). See its API documentation for more on clearing highlights.
- It deselects any currently selected location using mapsIndoorsInstance.deselectLocation(). Refer to its API documentation for deselection behavior.
- If the query length is less than 3 characters, it hides the searchResultsElement and exits to prevent overly broad or empty searches.
- It prepares searchParameters with the q (query) and scopes the search to the currentVenue.name. For a comprehensive list of search options, check out the LocationsService.getLocations() documentation
- It calls mapsindoors.services.LocationsService.getLocations(searchParameters) to fetch locations. This asynchronous method returns a Promise.
- .then(locations => { ... }): This block handles the successful response from the LocationsService. locations is an array of objects, where each object conforms to the Location interface.
  - It clears previous search results by setting searchResultsElement.innerHTML = null.
  - If no locations are found, it displays a "No results found" message in the list.
  - Otherwise, it iterates through each location object:
    Creates an <li> element.
    Sets its innerHTML to location.properties.name. The properties object on an object conforming to the Location interface contains various details about the location. For more information, see the Location documentation.
    Stores location.id in listElement.dataset.locationId for potential future use.
    Adds a click event listener to the list item. When clicked:
    mapsIndoorsInstance.goTo(location): Pans and zooms the map to the clicked location. For more details on goTo(), see its reference.
    mapsIndoorsInstance.setFloor(location.properties.floor): Changes the map to the location's floor. To understand floor management, check the setFloor() documentation.
    mapsIndoorsInstance.selectLocation(location): Selects and highlights this specific location on the map. For further information, refer to the selectLocation() API documentation.
    Appends the new list item to searchResultsElement.
    Collects all location.ids into locationIdsToHighlight.
  - Makes the searchResultsElement visible by removing the .hidden class.
  - Calls mapsIndoorsInstance.highlight(locationIdsToHighlight) to highlight all found locations on the map simultaneously. The highlight() method accepts an array of location IDs. See its API documentation for details on batch highlighting.
- .catch(error => { ... }): Handles potential errors during the search request, logging them to the console and displaying an error message in the list.
The handleLocationClick function is now used for both map clicks and search result clicks, ensuring consistent behavior and code reuse.
When a user clicks a search result or a POI on the map, the map will center on that location, switch to the correct floor, and select the location.
This pattern will be reused and expanded in later steps.

Expected Outcome

After implementing these changes:

A search panel will be visible in the top-left corner of your map.
Typing 3 or more characters into the search input will trigger a search.
Matching locations will appear as a clickable list below the search input.
All matching locations will be highlighted on the map.
Clicking a location in the list will:
- Pan and zoom the map to that location.
- Switch to the correct floor if necessary.
- Select and distinctively highlight that specific location on the map.

Troubleshooting

Search not working / No results:
- Check the browser's developer console (F12) for errors.
- Ensure your MapsIndoors API Key (02c329e6777d431a88480a09 for demo) is correct and the MapsIndoors SDK is loaded.
- Verify YOUR_GOOGLE_MAPS_API_KEY is correct.
- Confirm the venue ID (dfea941bb3694e728df92d3d for demo) is valid and the venue has searchable locations.
- Make sure the onSearch function is being called (e.g., add a console.log at the beginning of onSearch).
Results list doesn't appear or looks wrong:
- Check CSS for the .panel, #search-results, and li elements. Ensure the .hidden class is being correctly added/removed.
Map interactions (goTo, highlight, selectLocation) not working:
- Verify mapsIndoorsInstance is correctly initialized.
- Ensure the location objects passed to these methods are valid objects conforming to the Location interface.
- Check for console errors when clicking a search result.

Next Steps

You've now successfully added a powerful search feature to your indoor map! Users can easily find their way to specific points of interest.

Next, learn how to display detailed information about a selected location:

Step 3: Show the Details

Last updated 6 months ago

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