JavaScript Gotchas in Java

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JavaScript Gotchas
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Because of the differences between the Java language and the JavaScript language, you need to consider the following when using LiveConnect: Because the versions of JavaScript prior to 14 do not support exceptions, you need to write a wrapper Java class to trap any potential exceptions Otherwise, if there is an exception (for example, if a server is not available at the speci ed host and port), your script will abort Navigator posts a discrete message in the status bar, as Figure 9-4 shows If you type javascript: in the URL eld of the browser, a dialog box appears and displays information about the error, as in Figure 9-5
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Accessing Java Objects from JavaScript 255
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FIGURE 9-2 Search results from JavaScript
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Because LDAP attributes have multiple values, you may want to pass the values of an attribute between your Java classes and JavaScript code as an array of strings To do this, you can write a JavaScript function that will create a JavaScript array to convert the Java String array Java String arrays are not interchangeable with JavaScript arrays of strings If the LDAP server is not running on the same machine as the Web server, you need to request permission to connect to the LDAP server You also need to sign your JavaScript code The rest of the chapter explains these points in more detail For more information on LiveConnect, see the Core JavaScript Guide (http://developernetscapecom/ docs/manuals/js/core/jsguide/indexhtm)
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256 Scripting LDAP: JavaScript and Java
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FIGURE 9-3 Reading attributes with JavaScript
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Handling Java Exceptions in JavaScript
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With JavaScript 14, you can throw and catch exceptions using the new throw and trycatch statements If Java code throws an exception, the exception is passed on to your JavaScript code At the time of this writing, however, the latest versions of Netscape Navigator (408 through 461) support only JavaScript 13, which provides no statements for handling Java exceptions To handle exceptions, you need to write a wrapper Java class with methods that (1) catch the exceptions, (2) possibly print out error messages about the exceptions, and (3) return status codes to indicate the success or failure of the operation
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FIGURE 9-4 Navigator message on Java exception
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Accessing Java Objects from JavaScript 257
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FIGURE 9-5 JavaScript message dialog box
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The following Java code in the wrapper class JSLDAPConnection provides a method (safeConnect) for trapping exceptions when connecting to the LDAP server and a corresponding method for disconnecting
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public class JSLDAPConnection extends LDAPConnection { public JSLDAPConnection() { super(); } /** * Connect to LDAP server * * @return 0 on success, an LDAP error code failure */ public int safeConnect( int version, String host, int port, String authdn, String authpw ) { try { connect( version, host, port, authdn, authpw ); } catch( LDAPException e ) { return (_errorCode = egetLDAPResultCode());
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258 Scripting LDAP: JavaScript and Java
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} _errorCode = 0; return 0; } /** * Disconnect from LDAP server * * @return 0 on success, an LDAP error code failure */ public int safeDisconnect() { try { disconnect(); } catch( LDAPException e ){ return (_errorCode = egetLDAPResultCode()); } _errorCode = 0; return 0; } }
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Your JavaScript code can construct a new JSLDAPConnection object and invoke the safeConnect method to connect to the LDAP server:
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<SCRIPT LANG="JavaScript"> var connection = new PackagesJSLDAPConnection(); var isConnected = connectionsafeConnect( 3, "directoryairiuscom", 389, "", "" ); </SCRIPT>
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JSLDAPConnection also has wrappers for searching and reading, and a method to get the latest status code from an LDAP operation:
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/** * Performs the search specified by the criteria you enter * This method also allows you to specify constraints for the search * (such as the maximum number of entries to find or the * maximum time to wait for search results) <P> * * @param base base distinguished name from which to search * @param scope scope of the entries to search * @param filter search filter specifying the search criteria * @param attrs list of attributes you want returned in the search * results
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