Interacting with Images

Images will always be part of any website. Without images, the interaction will not be complete or the experience of users will be dull. This very important component should be part especially for online applications since it will provide visual interaction and instruction to users.

JavaScript and Ajax do not just provide simple interaction with images. Developers have a variety of tools to work with images so that they can be implemented in a very creative way. As long as the developer is willing to code the actions of the images, JavaScript and Ajax is willing to provide the expected interaction.

The code for images goes this way:

image = image ([width] [height])

The "image" can be changed according to the developer's preferences. The first "image" would be the tag that will be implemented in the application. To load the image, developers still have to point out its source and the code should go this way (after the first line)

image.src = "location"

The main advantage of this setting, compared to standard HTML code of images is that the tag can become an object. This object can then be implemented in various parts in the application and can even override another object. Instead of manually implementing a set of rules for HTML images, JavaScript and Ajax enabled images can be implemented at will.

Working with Properties

Properties in images are not just limited to height and width. The following are unique properties for images in JavaScript and Ajax:

Low Resolution Property - This type of property will allow the developer to load the low resolution image first before the actual image in the application is loaded. This is ideal for thumbnail previews or in actual websites. This can be done by adding another image source that bears the actual low resolution image.

        Syntax: filename.lowsrc

VSpace and HSpace Property

VSpace (filename.vspace) and HSpace (filename.hspace) are two read-only properties for images in JavaScript. Their role in the application is to provide the value of the image in terms of pixels. VSpace indicates the pixels from the top to the bottom of the image. HSpace indicates the pixels from the left to the right of the image.

Even Handlers for Images

The following are notable event handlers for images in JavaScript and Ajax:

OnAbort EventHanlder - this code, as the name suggests, is implemented when the image is discarded or the website is closed. Developers can call in another function as a prompt or additional option for users.

OnError EventHandler - the function is called if the user fails to load the image. For example, the user cancels the loading of the webpage during image loading. The function might remind the user about the importance of the image or would simply load the lower resolution version.

Images in JavaScript can be implemented in many ways. Because of the variety of properties and event handlers, images can become part of the tool that provides the needed interaction for an efficient Ajax and JavaScript based application.