Resize a Popup to Fit an Image's Size

This article demonstrates a clever JavaScript solution for dynamically resizing popup windows to perfectly fit the images they display. The technique works across various browsers including Netscape Navigator 4/5/6/7 and Internet Explorer 4/5/6.

The solution involves two files: a main HTML page containing links to images and a popup HTML file (popup.htm).

The main HTML page includes links that, when clicked, call a JavaScript function PopupPic(). This function opens popup.htm in a new window, passing the image URL via the query string:

function PopupPic(sPicURL) {
    window.open("popup.htm?" + sPicURL, "", "resizable=1,HEIGHT=200,WIDTH=200");
}

popup.htm uses JavaScript to extract the image URL from the query string, then dynamically inserts the <img alt="Resize a Popup to Fit an Image&#x27;s Size" > tag into the page using document.write(). Crucially, it uses the onload event to call the FitPic() function after the image has loaded:

var arrTemp = self.location.href.split("?");
var picUrl = (arrTemp.length > 1) ? arrTemp[1] : "";
var NS = (navigator.appName == "Netscape") ? true : false;

function FitPic() {
    var iWidth = (NS) ? window.innerWidth : document.body.clientWidth;
    var iHeight = (NS) ? window.innerHeight : document.body.clientHeight;
    iWidth = document.images[0].width - iWidth;
    iHeight = document.images[0].height - iHeight;
    window.resizeBy(iWidth, iHeight);
    self.focus();
};

document.write("<img  src="%22%20+%20picUrl%20+%20%22" border="0" alt="Resize a Popup to Fit an Image&#x27;s Size" >");

The FitPic() function calculates the difference between the image dimensions and the browser window's dimensions. It then uses window.resizeBy() to adjust the popup window size accordingly, ensuring a perfect fit.

This method elegantly solves the common problem of mismatched popup and image sizes, providing a user-friendly image viewing experience. The script's efficiency and cross-browser compatibility make it a valuable tool for webmasters managing image galleries.

Frequently Asked Questions (FAQ): (Summarized for brevity)

• Ensuring Popup Resizing: Use JavaScript to dynamically get image dimensions and set popup size accordingly.
• Best Practices: Avoid exceeding viewport size, maintain aspect ratio, provide a close button, and test on various screen sizes.
• Resizing Images in JavaScript: Use the canvas element for high-quality resizing.
• Recommended Popup Sizes: Desktop: ~700-800px wide, 500-600px high; Mobile: ~300-350px wide, 200-250px high. Adapt to content and design.
• Smooth Resizing: Use canvas's drawImage with smoothingQuality = 'high'.
• Popup Design Best Practices: Keep it simple, use clear messaging, and make it easy to close.
• Responsive Popups: Use CSS media queries and JavaScript for dynamic adjustments.
• Testing on Different Screen Sizes: Utilize browser developer tools' device emulation features.

This revised response provides a more concise and readable explanation while retaining the core information and maintaining the image.

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