Data
Compression
This is an example managing compression:
<!DOCTYPE html>
<html>
<head>
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<title>Data: Compression - Example</title>
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<link rel="stylesheet" type="text/css" href="main.css" />
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<script src="main.js" type="text/javascript" language="javascript"></script>
</head>
<body>
Type something:
<br />
<textarea id="text">Hello, CrossBrowdy! This is my data to test compression.</textarea>
<br />
<span id="content"></span>
<br />
<!-- The "CB_console" element will be used automatically in the case that the client does not support console: -->
<div id="CB_console" style="display:none; visibility:hidden; overflow:scroll;">
<span style="font-weight:bold;">Console:</span><br />
</div>
<div id="crossbrowdy_info"><a href="https://crossbrowdy.com/examples/data/compression" target="_blank">CrossBrowdy.com example</a></div>
</body>
</html>
/* This file belongs to a CrossBrowdy.com example, made by Joan Alba Maldonado. Creative Commons Attribution 4.0 International License. */
body { background-color:#aaddee; word-wrap:break-word; }
#crossbrowdy_info { position:fixed; bottom:2px; right:2px; }
#crossbrowdy_info a { color:#00aadd; }
#crossbrowdy_info a:hover { color:#0033aa; }
span { color:#aa0000; }
textarea { color:#006600; width:100%; }
/* This file belongs to a CrossBrowdy.com example, made by Joan Alba Maldonado. Creative Commons Attribution 4.0 International License. */
CB_init(main); //It will call the "main" function when ready.
//This function will be called when CrossBrowdy is ready:
function main()
{
processString();
}
var myDataStringLast = null;
function processString()
{
//Example of data compression and decompression management:
var myDataString = CB_Elements.id("text").value;
//If the text introduced the same one or it is empty, exits calling itself again:
if (myDataString === myDataStringLast || myDataString.length === 0) { setTimeout(processString, 1); return; }
CB_Elements.insertContentById("content", "Original length: " + myDataString.length + "<br /><br />");
//Gets the 'LZString' object:
var lz = CB_getLZStringObject();
//Compressing and decompressing (can produce invalid UTF-16 strings):
var myDataStringCompressed = lz.compress(myDataString);
var myDataStringDecompressed = lz.decompress(myDataStringCompressed); //Returns 'myDataString' again.
CB_Elements.appendContentById("content", "LZ compression: " + (myDataStringDecompressed === myDataString ? "CORRECT" : "<b>FAILED</b>") + "<br />");
CB_Elements.appendContentById("content", "LZ compression result: " + myDataStringCompressed + "<br />");
CB_Elements.appendContentById("content", "LZ compression result length: " + myDataStringCompressed.length + "<br />");
CB_Elements.appendContentById("content", "LZ compression ratio: " + CB_numberFormat((myDataStringCompressed.length / myDataString.length - 1) * 100 * -1, 2, true) + "%<br /><br />");
//Compressing and decompressing using "valid" UTF-16 (useful for local storage):
var myDataStringCompressed_UTF16 = lz.compressToUTF16(myDataString); //Compressed in valid UTF-16.
var myDataStringDecompressed_2 = lz.decompressFromUTF16(myDataStringCompressed_UTF16); //Decompressed from UTF-16 valid data. Returns 'myDataString' again.
CB_Elements.appendContentById("content", "LZ UTF-16 compression: " + (myDataStringDecompressed_2 === myDataString ? "CORRECT" : "<b>FAILED</b>") + "<br />");
CB_Elements.appendContentById("content", "LZ UTF-16 compression result: " + myDataStringCompressed_UTF16 + "<br />");
CB_Elements.appendContentById("content", "LZ UTF-16 compression result length: " + myDataStringCompressed_UTF16.length + "<br />");
CB_Elements.appendContentById("content", "LZ UTF-16 compression ratio: " + CB_numberFormat((myDataStringCompressed_UTF16.length / myDataString.length - 1) * 100 * -1, 2, true) + "%<br /><br />");
//Encoding and decoding in base 64:
var myDataStringEncoded_base64 = lz.compressToBase64(myDataString); //Compressed encoding in base 64.
var myDataStringDecoded_base64 = lz.decompressFromBase64(myDataStringEncoded_base64); //Decompressed data encoded in base 64. Returns 'myDataString' again.
CB_Elements.appendContentById("content", "LZ Base 64 encoding: " + (myDataStringDecoded_base64 === myDataString ? "CORRECT" : "<b>FAILED</b>") + "<br />");
CB_Elements.appendContentById("content", "LZ Base 64 encoding result: " + myDataStringEncoded_base64 + "<br />");
CB_Elements.appendContentById("content", "LZ Base 64 encoding result length: " + myDataStringEncoded_base64.length + "<br />");
CB_Elements.appendContentById("content", "LZ Base 64 encoding ratio: " + CB_numberFormat((myDataStringEncoded_base64.length / myDataString.length - 1) * 100 * -1, 2, true) + "%<br /><br />");
//Compressing and decompressing base 64 data (using the 'Base64String' object):
var lzBase64 = CB_getBase64StringObject(); //Gets the 'Base64String' object.
var myDataStringCompressed_UTF16_base64_2 = lzBase64.compress(myDataStringEncoded_base64); //Compresses data which is already in base 64.
var myDataString_base64 = lzBase64.decompress(myDataStringCompressed_UTF16_base64_2); //Decompressed the encoded base 64 data. Returns 'myDataStringEncoded_base64' again.
var myDataStringDecompressed_4 = lz.decompressFromBase64(myDataString_base64); //Decodes the base 64 data. Returns 'myDataString' again.
CB_Elements.appendContentById("content", "LZ Base 64 compression (Base64String): " + (myDataStringDecompressed_4 === myDataString ? "CORRECT" : "<b>FAILED</b>") + "<br />");
CB_Elements.appendContentById("content", "LZ Base 64 compression (Base64String) result: " + myDataStringCompressed_UTF16_base64_2 + "<br />");
CB_Elements.appendContentById("content", "LZ Base 64 compression (Base64String) result length: " + myDataStringCompressed_UTF16_base64_2.length + "<br />");
CB_Elements.appendContentById("content", "LZ Base 64 compression (Base64String) ratio: " + CB_numberFormat((myDataStringCompressed_UTF16_base64_2.length / myDataString.length - 1) * 100 * -1, 2, true) + "%<br /><br />");
//Compressing and decompressing using base 64 and valid for URI components:
var myDataStringCompressed_UTF16_base64_URIComponent = lz.compressToEncodedURIComponent(myDataString); //Compressed encoding in base 64 and encoded for URI components.
var myDataStringDecompressed_5 = lz.decompressFromEncodedURIComponent(myDataStringCompressed_UTF16_base64_URIComponent); //Decompressed from data encoded in base 64 and encoded for URI components. Returns 'myDataString' again.
CB_Elements.appendContentById("content", "LZ compression (valid URI components): " + (myDataStringDecompressed_5 === myDataString ? "CORRECT" : "<b>FAILED</b>") + "<br />");
CB_Elements.appendContentById("content", "LZ compression result (valid URI components): " + myDataStringCompressed_UTF16_base64_URIComponent + "<br />");
CB_Elements.appendContentById("content", "LZ compression result length (valid URI components): " + myDataStringCompressed_UTF16_base64_URIComponent.length + "<br />");
CB_Elements.appendContentById("content", "LZ compression ratio (valid URI components): " + CB_numberFormat((myDataStringCompressed_UTF16_base64_URIComponent.length / myDataString.length - 1) * 100 * -1, 2, true) + "%<br /><br />");
//Compressing and decompressing using 'uint8Array':
var myDataStringCompressed_Uint8Array = lz.compressToUint8Array(myDataString); //Compressed in a 'uint8Array'.
try //Prevents IE6 error.
{
var myDataStringDecompressed_6 = lz.decompressFromUint8Array(myDataStringCompressed_Uint8Array); //Decompressed from a 'uint8Array'. Returns 'myDataString' again.
}
catch(E) { var myDataStringDecompressed_6 = ""; }
CB_Elements.appendContentById("content", "LZ compression (uint8Array): " + (myDataStringDecompressed_6 === myDataString ? "CORRECT" : "<b>FAILED</b>") + (myDataStringDecompressed_6 === "" ? " (decompressed string is empty)" : "") + "<br />");
CB_Elements.appendContentById("content", "LZ compression result (uint8Array): " + myDataStringCompressed_Uint8Array + "<br />");
CB_Elements.appendContentById("content", "LZ compression result length (uint8Array): " + myDataStringCompressed_Uint8Array.length + "<br />");
CB_Elements.appendContentById("content", "LZ compression ratio (uint8Array): " + CB_numberFormat((myDataStringCompressed_Uint8Array.length / myDataString.length - 1) * 100 * -1, 2, true) + "%<br /><br />");
//Calls itself again:
setTimeout(processString, 1);
}
You can check the Guides & Tutorials category as well as the API documentation in the case you need more information.
All the examples together can be downloaded here.