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How To Check If An Embedded Svg Document Is Loaded In An Html Page

Embedding SVG (Scalable Vector Graphics) documents into your HTML pages can bring visual appeal and interactivity to your website. In this guide, we'll walk you through the process of checking if an embedded SVG document has loaded successfully on your HTML page.

One common way to embed an SVG document into an HTML page is by using the '' tag. When the browser encounters this tag, it attempts to load the SVG file specified in the 'src' attribute.

To check if the SVG document has loaded, we can use JavaScript. By adding a 'load' event listener to the '' tag, we can trigger a function once the SVG file has finished loading.

Here's how you can implement this:

Javascript

const svgImage = document.querySelector('#svg-img');

svgImage.addEventListener('load', () => {
    console.log('SVG document loaded successfully');
    // Additional code to run once the SVG is loaded
});

In this code snippet, we first select the '' tag with the id 'svg-img' using the querySelector method. We then attach a 'load' event listener to this element. When the SVG document finishes loading, we log a message to the console and execute any additional code we want to run.

It's important to note that the 'load' event may not fire if the SVG file is cached by the browser. To handle this, we can check the 'complete' property of the '' tag to see if the image has already been loaded:

Javascript

const svgImage = document.querySelector('#svg-img');

if (svgImage.complete) {
    console.log('SVG document already loaded');
} else {
    svgImage.addEventListener('load', () => {
        console.log('SVG document loaded successfully');
        // Additional code to run once the SVG is loaded
    });
}

By checking the 'complete' property first, we ensure that our code works as expected even if the SVG file is cached.

In some cases, you may want to handle errors if the SVG document fails to load. To do this, you can listen for the 'error' event on the image element:

Javascript

svgImage.addEventListener('error', () => {
    console.error('Failed to load SVG document');
    // Additional error handling code
});

By adding an 'error' event listener, you can detect when the SVG document loading process encounters an issue, allowing you to implement appropriate error-handling mechanisms.

In conclusion, by utilizing JavaScript event listeners, you can easily check if an embedded SVG document has loaded in your HTML page. Monitoring the 'load' and 'error' events provides you with the necessary tools to ensure a seamless user experience when incorporating SVG graphics into your web projects.

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