Category: JavaScript Answers

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JavaScript Answers

How to create a custom InfoWindow with Google Maps and JavaScript?

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Creating a custom InfoWindow in Google Maps JavaScript API allows you to customize the appearance and behavior of the default InfoWindow.

For example we write:

HTML:

<!DOCTYPE html>
<html>
<head>
    <title>Custom InfoWindow</title>
    <style>
        #map {
            height: 400px;
            width: 100%;
        }

        .custom-info-window {
            background-color: white;
            padding: 10px;
            border-radius: 5px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
    </style>
</head>
<body>
    <div id="map"></div>

    <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap" async defer></script>
    <script>
        function initMap() {
            const map = new google.maps.Map(document.getElementById('map'), {
                center: {lat: 40.7128, lng: -74.0060},
                zoom: 12
            });

            const infowindow = new google.maps.InfoWindow({
                content: '<div class="custom-info-window">Custom InfoWindow Content</div>'
            });

            const marker = new google.maps.Marker({
                position: {lat: 40.7128, lng: -74.0060},
                map: map,
                title: 'Marker Title'
            });

            marker.addListener('click', function() {
                infowindow.open(map, marker);
            });
        }
    </script>
</body>
</html>

In this example, we should replace "YOUR_API_KEY" with your actual Google Maps API key.

We’ve added a <div> element with id "map" to hold the map.

In the CSS, we’ve added some styles for the custom InfoWindow, such as background color, padding, border-radius, and box-shadow.

In the JavaScript, we initialize the map and create a custom InfoWindow using the google.maps.InfoWindow class.

We set the content property to the HTML content that you want to display inside the InfoWindow.

We create a marker on the map and attach a click event listener to it. When the marker is clicked, we open the custom InfoWindow with the infowindow.open() method, passing the map and marker as parameters.

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JavaScript Answers

How to get the text of an input text box during onKeyPress with JavaScript?

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You can get the text of an input text box during the onkeypress event in JavaScript by accessing the value property of the input element.

Here’s how you can do it:

HTML:

<input type="text" id="myInput" onkeypress="getText(event)">

JavaScript:

<script>
    function getText(event) {
        const inputText = event.target.value;
        console.log(inputText);
    }
</script>

In this example, we have an input text box with the id “myInput”.

We’ve added an onkeypress event handler to the input element, which calls the getText function when a key is pressed.

In the getText function, we access the value property of the input element using event.target.value. This gives us the current value of the input text box.

We can then use this value as needed. In this example, we’re logging it to the console.

This will log the text of the input text box to the console every time a key is pressed.

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JavaScript Answers

How to change CSS :root color variables in JavaScript?

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You can change CSS :root color variables in JavaScript by accessing the document.documentElement.style object.

To do this we write:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Change CSS :root Color Variables</title>
    <style>
        :root {
            --main-color: red;
        }

        .box {
            width: 200px;
            height: 200px;
            background-color: var(--main-color);
        }
    </style>
</head>
<body>
    <div class="box"></div>
    <button onclick="changeColor()">Change Color</button>

    <script>
        function changeColor() {
            // Access the root element
            const root = document.documentElement;

            // Change the value of the --main-color variable
            root.style.setProperty('--main-color', 'blue');
        }
    </script>
</body>
</html>

In this example, the :root pseudo-class defines CSS variables.

We have a .box div with a background color set to the value of the --main-color variable.

When the button is clicked, the changeColor() function is called.

Inside the function, we access the root element (document.documentElement) and use the setProperty() method to change the value of the --main-color variable to 'blue'.

You can replace 'blue' with any color value you want.

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JavaScript Answers

How to make HTML elements resizable using pure JavaScript?

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You can make HTML elements resizable using JavaScript by implementing functionality that captures mouse events and adjusts the size of the element accordingly.

To do this we can write:

HTML:

<div id="resizable" style="width: 200px; height: 200px; border: 1px solid black;">
    <!-- Content goes here -->
</div>

JavaScript:

<script>
    const resizableElement = document.getElementById('resizable');
    let isResizing = false;
    let initialX;
    let initialY;
    let initialWidth;
    let initialHeight;

    resizableElement.addEventListener('mousedown', (e) => {
        isResizing = true;
        initialX = e.clientX;
        initialY = e.clientY;
        initialWidth = parseInt(document.defaultView.getComputedStyle(resizableElement).width, 10);
        initialHeight = parseInt(document.defaultView.getComputedStyle(resizableElement).height, 10);
        document.addEventListener('mousemove', resizeElement);
        document.addEventListener('mouseup', stopResize);
    });

    function resizeElement(e) {
        if (isResizing) {
            const width = initialWidth + (e.clientX - initialX);
            const height = initialHeight + (e.clientY - initialY);
            resizableElement.style.width = `${width}px`;
            resizableElement.style.height = `${height}px`;
        }
    }

    function stopResize() {
        isResizing = false;
        document.removeEventListener('mousemove', resizeElement);
        document.removeEventListener('mouseup', stopResize);
    }
</script>

In this script, we start resizing when the user clicks on the element (mousedown event).

As the user moves the mouse (mousemove event), we calculate the change in mouse position and adjust the size of the element accordingly.

When the user releases the mouse button (mouseup event), resizing stops.

You can customize this code further to suit your specific requirements, such as constraining the minimum and maximum size of the element or adding resize handles.

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JavaScript Answers

How to play local (hard-drive) video file with HTML5 video tag with JavaScript?

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You can play a local video file using the HTML5 <video> tag along with JavaScript. Here’s how you can do it:

1. HTML Structure

Add a <video> tag to your HTML file. You’ll need to specify the src attribute with the path to your local video file.

```html
<video id="myVideo" width="320" height="240" controls>
    <source src="path_to_your_video.mp4" type="video/mp4">
    Your browser does not support the video tag.
</video>
```
</code></pre>
<h3>2. JavaScript</h3>
<p>You can control the video playback using JavaScript. For example, you can play, pause, or adjust the playback rate.</p>
<pre><code>```html
<script>
    const video = document.getElementById('myVideo');

    function playVideo() {
        video.play();
    }

    function pauseVideo() {
        video.pause();
    }

    function setPlaybackRate(rate) {
        video.playbackRate = rate;
    }
</script>
```
</code></pre>
<h3>3. Event Handling</h3>
<p>You can also handle various events of the <code><video></code> element, such as <code>play</code>, <code>pause</code>, <code>ended</code>, etc., to perform certain actions.</p>
<pre><code>```html
<script>
    video.onplay = function() {
        console.log("Video is playing");
    };

    video.onpause = function() {
        console.log("Video is paused");
    };

    video.onended = function() {
        console.log("Video has ended");
    };
</script>
```

Remember to replace "path_to_your_video.mp4" with the actual path to your local video file.

Also, make sure that the video file is in a format supported by the <video> tag (e.g., MP4, WebM, Ogg).