Resizing Images on the Fly

Resizing Images on the Fly

I know that with DHTML, it is possible to resize images using the Onmousover event handler, but the example shown on the Microsoft Dev site involves basically switching between two different images: one of either size instead of actually resizing the actual image. Is there a way to resize without having the Onmouseover display two separate images? For instance, I have an image that when the mouse isn’t over it I want to be at a default 85 x 128 size, but with the mouse on it, I want it to resize to 255 x 384. Is this even possible? Thanks in advance!

Microsoft’s document object model can be a little confusing. There are actually three sets of properties that give the width and height of an image, a div, or any other element. Of the three sets, the one that can be used to resize an image is the pair pixelWidth and pixelHeight (note case here, JavaScript is case sensitive). The properties pixelWidth and pixelHeight are below the style object, and are set if the IMG tag sets the width and height of the image explicitly.

It’s easiest to encapsulate resizing into a single function, which I define here as SetSize. SetSize takes four arguments: a pointer to the object in question (I’ll show you how to reference that in a second), the width and height, and a text flag that can be set to one of the following: (“*”,”%”,”#”,””), with these meanings:

“*” (scale) Multiply the dimensions of the object by the scale factors.
“%” (percent) Multiply the dimensions by the scale factors, then divide by 100
“#” (absolute) Set the dimensions to the scale factors.
“” (default) Same as absolute

You would then call the function in whatever event handler you need. Note that the function doesn’t retain any information about the size of the image initially, although you could retain that information with static variables.

Now, to call the handler so that it doubled the size when you entered into it and restored it when you left, you’d do something similar to the following:

The term “this” is a pointer to the object being passed (it doesn’t necessarily have to be an image, by the way). The parser will know to associate “this” with its enclosing tag, in this case the IMG tag.

A similar solution can be applied to Netscape objects, although there the salient pair is labeled me.width and me.height respectively rather than and

Share the Post:
XDR solutions

The Benefits of Using XDR Solutions

Cybercriminals constantly adapt their strategies, developing newer, more powerful, and intelligent ways to attack your network. Since security professionals must innovate as well, more conventional endpoint detection solutions have evolved

AI is revolutionizing fraud detection

How AI is Revolutionizing Fraud Detection

Artificial intelligence – commonly known as AI – means a form of technology with multiple uses. As a result, it has become extremely valuable to a number of businesses across

AI innovation

Companies Leading AI Innovation in 2023

Artificial intelligence (AI) has been transforming industries and revolutionizing business operations. AI’s potential to enhance efficiency and productivity has become crucial to many businesses. As we move into 2023, several

data fivetran pricing

Fivetran Pricing Explained

One of the biggest trends of the 21st century is the massive surge in analytics. Analytics is the process of utilizing data to drive future decision-making. With so much of

kubernetes logging

Kubernetes Logging: What You Need to Know

Kubernetes from Google is one of the most popular open-source and free container management solutions made to make managing and deploying applications easier. It has a solid architecture that makes

ransomware cyber attack

Why Is Ransomware Such a Major Threat?

One of the most significant cyber threats faced by modern organizations is a ransomware attack. Ransomware attacks have grown in both sophistication and frequency over the past few years, forcing

data dictionary

Tools You Need to Make a Data Dictionary

Data dictionaries are crucial for organizations of all sizes that deal with large amounts of data. they are centralized repositories of all the data in organizations, including metadata such as