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load (LoadVars.load method)
public load(url:String) : Boolean
Downloads variables from the specified URL, parses the variable data, and places the resulting variables in my_lv. Any properties in my_lv with the same names as downloaded variables are overwritten. Any properties in my_lv with different names than downloaded variables are not deleted. This is an asynchronous action.
The downloaded data must be in the MIME content type application/x-www-form-urlencoded.
This is the same format that is used by loadVariables().
Also, in files published for Flash Player 7, case-sensitivity is supported for external variables that are loaded with LoadVars.load().
This method is similar to XML.load().
Note: If a file being loaded contains non-ASCII characters (as found in many non-English languages), it is recommended that you save the file with UTF-8 or UTF-16 encoding as opposed to a non-Unicode format like ASCII.
When using this method, consider the Flash Player security model:
For Flash Player 8:
Data loading is not allowed if the calling SWF file is in the local-with-file-system sandbox and the target resource is from a network sandbox.
Data loading is also not allowed if the calling SWF file is from a network sandbox and the target resource is local.
For more information, see the following:
Chapter 17, "Understanding Security," in Learning ActionScript 2.0 in Flash
The Flash Player 8 Security white paper at http://www.macromedia.com/go/fp8_security
The Flash Player 8 Security-Related API white paper at http://www.macromedia.com/go/fp8_security_apis
For Flash Player 7 and later websites can permit cross-domain access to a resource via a cross-domain policy file. In SWF files of any version running in Flash Player 7 and later, url must be in exactly the same domain. For example, a SWF file at www.someDomain.com can load data only from sources that are also at www.someDomain.com.
In SWF files that are running in a version of the player earlier than Flash Player 7, url must be in the same superdomain as the SWF file that is issuing this call. A superdomain is derived by removing the left-most component of a file's URL. For example, a SWF file at www.someDomain.com can load data from sources at store.someDomain.com because both files are in the same superdomain of someDomain.com.
Availability: ActionScript 1.0; Flash Player 6 - Behavior changed in Flash Player 7.
Parameters
url:String - A string; the URL from which to download the variables. If the SWF file issuing this call is running in a web browser, url must be in the same domain as the SWF file.
Returns
Boolean - false if no parameter (null) is passed; true otherwise. Use the onLoad() event handler to check the success of loaded data.
Example
The following code defines an onLoad handler function that signals when data is returned to the Flash application from a server-side PHP script, and then loads the data in passvars.php.
var my_lv:LoadVars = new LoadVars();
my_lv.onLoad = function(success:Boolean) {
if (success) {
trace(this.toString());
} else {
trace("Error loading/parsing LoadVars.");
}
};
my_lv.load("http://www.helpexamples.com/flash/params.txt");
For another example, see the guestbook.fla file in the ActionScript samples folder. Here are some typical paths to this folder:
Windows: boot drive\Program Files\Macromedia\Flash 8\Samples and Tutorials\Samples\ActionScript
Macintosh: Macintosh HD/Applications/Macromedia Flash 8/Samples and Tutorials/Samples/ActionScript
See also
load (XML.load method), loaded (LoadVars.loaded property), onLoad (LoadVars.onLoad handler), useCodepage (System.useCodepage property) |
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