SVG (Scalable Vector Graphics) is a popular file format used for creating high-quality, scalable graphics and animations on the web. It is widely used in web design and development, as it allows for crisp, detailed images that can be scaled to any size without losing quality.
One of the great things about SVG is that it can be easily embedded into HTML pages. This means that you can include your SVG graphics directly in your HTML code, without having to link to a separate file. This can make your web pages more efficient and easier to maintain.
However, sometimes you may encounter a situation where you need to check whether an embedded SVG document is loaded in your HTML page. This can be useful if you want to perform certain actions or make changes to your page based on the presence of an SVG document.
So, how do you check if an embedded SVG document is loaded in an HTML page? Let's explore some methods.
Method 1: Using JavaScript
JavaScript is a popular scripting language used to create dynamic and interactive web pages. It can also be used to manipulate SVG elements on a web page.
To check if an embedded SVG document is loaded, you can use the JavaScript DOM (Document Object Model) API. This API allows you to access and manipulate the elements of an HTML document.
First, you need to get a reference to the embedded SVG element. This can be done using the document.getElementById() method, which takes the ID of the SVG element as a parameter. If the SVG element exists on the page, the method will return a reference to it.
Next, you can check if the SVG element has loaded by using the onload event handler. This event is triggered when all the assets on the page, including the SVG document, have finished loading.
Here's an example code snippet:
```
<svg id="mySVG" onload="checkSVG()">
<!-- SVG document content goes here -->
</svg>
<script>
function checkSVG() {
var svg = document.getElementById("mySVG");
if (svg) {
console.log("SVG document loaded!");
} else {
console.log("SVG document not loaded!");
}
}
</script>
```
If the SVG document is loaded, the console will display "SVG document loaded!". Otherwise, it will display "SVG document not loaded!".
Method 2: Using CSS
Another way to check if an embedded SVG document is loaded is by using CSS. The :empty pseudo-class can be used to select elements that have no children. If the SVG element is empty, it means that the SVG document has not been loaded.
Here's an example CSS code:
```
svg:empty {
content: "SVG document not loaded!";
}
```
If the SVG document is not loaded, the text "SVG document not loaded!" will be displayed inside the SVG element. Otherwise, the SVG element will contain the actual content of the SVG document.
Method 3: Using a third-party library
If you're not comfortable with JavaScript or CSS, you can also use a third-party library to check if an embedded SVG document is loaded. Libraries like jQuery and Snap.svg provide APIs that make it easier to manipulate SVG elements on a web page.
For example, with jQuery, you can use the .ready() method to check if the SVG document has loaded. Here's an example code snippet:
