let picture=new Image();
picture.src='yyyyy';
Is the browser required to wait for the image to be fully loaded before proceeding with the next line of code?
let picture=new Image();
picture.src='yyyyy';
Is the browser required to wait for the image to be fully loaded before proceeding with the next line of code?
Performing that task asynchronously is essential; many image pre-loading scripts depend on this functionality.
UPDATE: Here's some additional information for those looking to make certain actions wait synchronously for images to load using JavaScript's image object. You can achieve this by utilizing the onload event, as shown below:
var img = new Image();
img.onload = function () { /* Insert onLoad code here */ };
img.src = 'xxxxxx';
Updating the src attribute of an image is done asynchronously.
When you execute the code
image.src = "http://newimage-url";it will return immediately and the browser will start loading the new image in a separate thread. Until the new image is fully loaded, certain attributes of the <img> tag, like width and height, may not be accurate.
This means that $(image).width() might not give you the correct width of the new image.
As @Dereleased suggested, you can use an 'on load' method to ensure that your code only runs after the image has completely loaded. jQuery's load() function is a convenient way to achieve this.
let image = new Image();
The traditional method of creating images is now outdated. It is recommended to use document.createElement('IMG') or create images through strings and innerHTML.
In the current web development landscape, images are considered replaced elements. This means that they will load as soon as they arrive, but space will be reserved for them in the layout flow if their dimensions are specified. If the dimensions are not specified, a default icon-sized space will be reserved, causing the screen to redraw when the image loads with its dimensions in the header. To provide a smoother user experience, it is advised to have image dimensions ready during the initial page rendering process.
Yes, I agree with @dereleased's point that image pre-loading is performed asynchronously. Additionally, it's worth mentioning that there are several methods to implement this technique using the Image() object in JavaScript, such as utilizing arrays or event handlers.
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