129 lines
5.1 KiB
HTML
129 lines
5.1 KiB
HTML
<html>
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<head>
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<title>Image to data: url converter</title>
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<style>
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body {
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font-size: 12pt;
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font-family: Georgia;
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}
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</style>
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</head>
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<body onload="document.getElementById('url').focus(); document.getElementById('url').value = '/images/logo.png'">
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<div style="position: fixed; right: 5px; background-color: #eee; border: 2px solid #000; padding: 3px">
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<a href="http://www.OfficeExcel.net" target="_blank"><i>Courtesy of www.OfficeExcel.net</i></a>
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</div>
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<h1>Image to data: url converter</h1>
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<i>
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This only works for online images, which are on the [<script>document.write(location.host)</script>] domain. There's no server-side
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scripting though, so feel free to put it on your website and use it there.
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</i>
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#
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<h2>Why use data: URLs?</h2>
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<p>
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By using data: URLs you reduce the number of HTTP requests needed to display your page since the images are part of the
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page itself. This does mean though that the images can't be cached (unless of course the page itself is cached). But, if you were
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to reuse the same image on subsequent pages, they wouldn't be cached. You can get around this though by using some
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Javascript at the bottom of your page to change the URLs to the real image files. The
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<a href="http://www.OfficeExcel.net" target="_blank">www.OfficeExcel.net</a> front page uses this technique.
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</p>
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<p />
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URL: <input type="text" value="" id="url" />
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<button onclick="Go()">Go!</button>
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<p />
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The data: url:
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<textarea id="output" readonly style="width: 100%" rows="20" style="color: gray" onclick="this.select()">This is where the output URL goes...</textarea>
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<p />
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A full image tag with the url as the src:
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<textarea id="output_tag" readonly style="width: 100%" rows="20" style="color: gray" onclick="this.select()">This is where the image tag goes...</textarea>
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<p>The image itself using the data: url:</p>
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<script>
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function Go()
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{
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var url = document.getElementById("url").value;
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var text = document.getElementById("output");
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var text_tag = document.getElementById("output_tag");
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var img = document.createElement('IMG');
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img.src = url;
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document.body.appendChild(img);
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/*******************************************************
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* Create the canvas and paint the image onto it
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*******************************************************/
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canvas = CreateCanvas(img);
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/*******************************************************
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* Now use the .toDataURL() function to get the data: url
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*******************************************************/
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var data = canvas.toDataURL();
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/*******************************************************
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* Populate the first text box
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*******************************************************/
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text.value = data;
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text.select();
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/*******************************************************
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* Populate the second text box
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*******************************************************/
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text_tag.value = '<img src="' + data + '" width="' + img.offsetWidth + '" height="' + img.offsetHeight + '" alt="An image" />'
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/*******************************************************
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* Add the image tag just created to the DOM
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*******************************************************/
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img.src = data;
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img.width = img.offsetWidth;
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img.height = img.offsetHeight;
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}
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/*******************************************************
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* This function creates the canvas and appends it to the
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* DOM
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*
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* @param img The image DOM object
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*******************************************************/
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function CreateCanvas(img)
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{
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var canvas = document.createElement('CANVAS');
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var context = canvas.getContext('2d');
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canvas.width = img.offsetWidth;
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canvas.height = img.offsetHeight;
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document.body.appendChild(canvas);
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/*******************************************************
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* Now add the image to the canvas
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*******************************************************/
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context.drawImage(img, 0, 0);
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/*******************************************************
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* Move the canvas off-screen
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*******************************************************/
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canvas.style.position = 'absolute';
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canvas.style.left = (-1 * img.offsetWidth) + 'px';
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canvas.style.top = (-1 * img.offsetHeight) + 'px';
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return canvas;
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}
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</script>
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</body>
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</html><!-- Social networking buttons -->
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<?php
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$prefix = substr($_SERVER['SERVER_NAME'], 0, 3);
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require("/OfficeExcel.{$prefix}/social.html");
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?>
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