rdlc data matrix

rdlc data matrix

rdlc data matrix

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We can t write very much Ajax code without coming across event-based programming techniques. JavaScript user interfaces are heavily event-driven, and the introduction of asynchronous requests with Ajax adds a further set of callbacks and events for our application to deal with. In a relatively simple application, an event such as a mouse click or the arrival of data from the server can be handled by a single function. As an application grows in size and complexity, though, we may want to notify several distinct subsystems and even to expose a mechanism whereby interested parties can sign themselves up for such notification. Let s explore an example to see what the issues are.

For example, when a user types his or her username this information is stored as a key value pair in Active Directory If user zsmith logs in, then an LDAP query is started that attempts to find a user in the directory with that value Once the user is found, the resultant set of keys that make up their user account can be accessed For example, zsmith may have a home directory that is stored on a network server This path name will be stored as a key (homeDirectory) in the Active Directory database Apple has two default plug-ins for communicating with LDAP servers, the LDAPv3 plug-in and the Active Directory plug-in These two plug-ins are very similar in terms of the back end communication they use However, Apple developed the Active Directory plug-in to supplement missing LDAP attributes that are not normally available in a standard Active Directory Schema.

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Using multiple event handlers It s common practice when scripting DOM nodes using JavaScript to define the script in the window.onload function, which is executed after the page (and therefore the DOM tree) is fully loaded. Let s say that we have a DOM element on our page that will display dynamically generated data fetched from the server at regular intervals once the page is loaded. The JavaScript that coordinates the data fetching and the display needs a reference to the DOM node, so it gets it by defining a window.onload event:

sudo sudo sudo sudo mkdir /var/mcxadmin chown mcxadmin /var/mcxadmin dscl /Local/MCX create /Users/mcxadmin home /var/mcxadmin dscl /Local/MCX create /Users/mcxadmin shell /bin/bash

The best example of this is the uidNumber attribute This attribute is normally used to contain the.

window.onload=function(){ displayDiv=document.getElementById('display'); }

All well and good. Let s say that we now want to add a second visual display that provides alerts from a news feed, for example (see chapter 13 if you re interested in implementing this functionality). The code that controls the news feed display also needs to grab references to some DOM elements on startup. So it defines a window.onload event handler, too:

numerical value associated with an account On a native Open Directory Server, this value is mapped from the server s uidNumber attribute to the local clients UniqueID attribute Without a UniqueID, users are not able to login, this is because of Mac OS X s UNUI underpinnings which require a UniqueID to track ownership on the file system If you use the LDAPv3 plug-in to authenticate to Active Directory (which is possible to do, though rarely implemented), the default RFC 2307 mappings would map a server attribute called uidNumber to a local plug-in mapping called UniqueID When a user attempted to login they would then query the server attribute uidNumber, and because it was unavailable but required for login, they would be unable to authenticate to the login window Apple saw this scenario and mitigated it in the design of the Active Directory plug-in.

window.onload=function(){ feedDiv=document.getElementById('feeds'); }

When a user logs into a workstation that is bound to Active Directory, the plugin itself generates a numerical value based on other information in the native directory and maps it to the UniqueID attribute You can think of this as a mask in front of the Active Directory server to make it seem more like a native Open Directory server Additionally, the Apple Active Directory plug-in will not only mask missing attributes but will also convert attributes that are in the wrong format for Mac OS X to being in the correct format Go back to our example of a home directory that was hosted on a network volume In Active Directory this network path is stored using Universal Naming Convention (UNC) or \\server\share Despite its universal name, this format is not supported for connecting to URIs in Mac OS X.

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