Wednesday, August 5th, 2009
Creating dynamic JavaScript on the fly can be useful when needing to target differing dynamically generated xml files for example. In my example below, I am creating the xml as I do here, and then using the dynamic JS to pass this new xml to a Flash template for display on the fly. The necessity for a dynamic JS script in this case is that the name of the xml changes dynamically, and also the JS script is named dynamically with a random value in order to prevent caching of the script.
To begin, the script is predominantly static, and is simply written to a JS file. Make sure every line is ended with the \r\n chararcters in order to be correctly written to the file. Essentially as below. I am using dynamic variables for the Flash height and the xml name:
<?php
$xyz = fopen("xml/".$jsname, "w");
fwrite($xyz, "<!--\r\n");
fwrite($xyz, "if (AC_FL_RunContent == 0 || DetectFlashVer == 0) {\r\n");
fwrite($xyz, " alert(\"This page requires AC_RunActiveContent.js.\");\r\n");
fwrite($xyz, "} else {\r\n");
fwrite($xyz, " var hasRightVersion = DetectFlashVer(requiredMajorVersion, requiredMinorVersion, requiredRevision);\r\n");
fwrite($xyz, " if(hasRightVersion) {\r\n");
fwrite($xyz, " AC_FL_RunContent(\r\n");
fwrite($xyz, " 'codebase', 'http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,45,0',\r\n");
fwrite($xyz, " 'width', '870',\r\n");
fwrite($xyz, " 'height', '".$heightval."',\r\n");
fwrite($xyz, " 'scale', 'noscale',\r\n");
fwrite($xyz, " 'salign', 'TL',\r\n");
fwrite($xyz, " 'bgcolor', '#777788',\r\n");
fwrite($xyz, " 'wmode', 'transparent',\r\n");
fwrite($xyz, " 'movie', 'flash',\r\n");
fwrite($xyz, " 'src', 'flash',\r\n");
fwrite($xyz, " 'FlashVars', 'library_path=flash/librarypath&xml_source=xml/".$xmlname."',\r\n");
fwrite($xyz, " 'id', 'my_flash',\r\n");
fwrite($xyz, " 'name', 'my_flash',\r\n");
fwrite($xyz, " 'menu', 'true',\r\n");
fwrite($xyz, " 'allowFullScreen', 'true',\r\n");
fwrite($xyz, " 'allowScriptAccess','sameDomain',\r\n");
fwrite($xyz, " 'quality', 'high',\r\n");
fwrite($xyz, " 'align', 'middle',\r\n");
fwrite($xyz, " 'pluginspage', 'http://www.macromedia.com/go/getflashplayer',\r\n");
fwrite($xyz, " 'play', 'true',\r\n");
fwrite($xyz, " 'devicefont', 'false'\r\n");
fwrite($xyz, " );\r\n");
fwrite($xyz, " } else {\r\n");
fwrite($xyz, " var alternateContent = 'This content requires the Adobe Flash Player. '\r\n");
fwrite($xyz, " + '<a href="http://www.macromedia.com/go/getflash/">Get Flash</a>.';\r\n");
fwrite($xyz, " document.write(alternateContent);\r\n");
fwrite($xyz, " }\r\n");
fwrite($xyz, "}\r\n");
fwrite($xyz, "// -->\r\n");
fclose($xyz);
?>
As you can see, I pass in variables $jsname, $xmlname, and $heightval which are used to construct the script. This is then called by setting a dynamic call to the JS script within the webpage itself using PHP, as below:
<?php
$rndnum = rand(1234, 9876);
$jsname = "script_name_".$rndnum.".js";
// make the JavaScript here
echo '';
?>
This can be linked to a script to create XML dynamically, as here, and there you have a truly dynamic display.
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