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Accessing Secure Data, Handling Busy State and Map Refresh, About the Busy State

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Page 43 highlights

Accessing Secure Data Map authors can control whether developers can use the getVertices and getLayerSetup methods to access coordinate values and/or map layer setup data. Map authors control the security of this data from the Map Layer Properties dialog box in Autodesk MapGuide Author. If map authors allow access to the API, they can also stipulate that the application must send in a specific passkey first. If you are building an application for a map that requires a passkey to access the coordinate values and/or the layer setup data, you will need to get the passkey from the map author and pass it in with the unLock method to enable the getVertices and getLayerSetup methods. Remember that users can view any embedded scripts in HTML, so in some cases you may not want to hard code your passkey in your Web page. To keep the passkey secure, we recommend that you implement one of the following techniques: I Create an application that includes one frame that displays the map only. Be sure that the map fills up the entire frame. In this case, users will not be able to view the source code of the frame that displays the map. You can then hard code the passkey in the source code of that frame. I Write a Java applet that makes a request for the passkey to your Autodesk MapGuide Server and then returns the passkey to the script in the Web page. Call this applet in your embedded script after making sure that the user has met your security criteria. I Write your entire Autodesk MapGuide Viewer application in a Java applet. Handling Busy State and Map Refresh This section describes the map busy state and the techniques for coordinating when and how to refresh a displayed map. When Autodesk MapGuide Viewer refreshes the map display, it can cause errors in your application unless you take the correct steps to prevent them. You need to familiarize yourself with the way that the Autodesk MapGuide Viewer API is designed so you can understand how to code your application correctly. About the Busy State Autodesk MapGuide Viewer enters a busy state whenever it refreshes the display, and the busy state does not end until the data has been received from the server and the display is updated or refreshed. Accessing Secure Data | 43

Section	Page
Developer’s Guide	1
Contents	3
Introduction	7
What’s New in Release 6	8
Autodesk DWG Data Source Support	8
Enhanced Support for Map Redraw Operations	8
Symbol Bitmap Support	8
Map Mode Retrieval Support	9
Java Edition Platform Support Changes	9
Before You Begin	9
Familiarity with Autodesk MapGuide	9
Programming and Scripting Languages	10
Your Audience	10
User Help	11
About the Autodesk MapGuide Viewer API	11
Autodesk MapGuide Viewer API Help	13
Autodesk MapGuide Web Site	13
What Is an Autodesk MapGuide Viewer API Application	13
Viewing Maps	14
Querying and Updating Data	14
Creating an Autodesk MapGuide Viewer API Application	15
Displaying Maps	17
Overview	18
Map Display for ActiveX Control and Plug-In	20
Linking to a Map	20
Displaying a Linked Map in a Different Window or Frame	21
Displaying a Specific Area of the Map	21
Embedding a Map	22
Embedding a Map in a Frame-Based Page	23
Map Display for the Java Edition	24
Map Display for Autodesk MapGuide LiteView	26
Installing Viewers on Client Machines	27
Accessing Maps	31
Overview	32
Map Access for ActiveX Control and Plug-In	32
Required Software for Autodesk MapGuide Viewer Plug-In	34
Map Access for the Java Edition	35
Map Access from HTML	35
Using JavaScript or JScript	35
Map Access Using Java	38
Wrapper Java Applet	38
Peer Java Applet	38
Wrapper Java Application	38
Required Software for the Java Edition	39
Java Edition Differences	39
Functional Differences with Java Edition	39
Browser Differences with Java Edition	40
Communicating with the Plug-In from a Java Applet	40
Accessing the Plug-In from a Java Applet	41
Calling JavaScript Functions from a Java Applet	42
Accessing Secure Data	43
Handling Busy State and Map Refresh	43
About the Busy State	43
Controlling Map Refresh Operations	45
Using the autoRefresh Flag	45
AutoRefresh Flag Caveats	46
Detecting Map Refreshes	46
Detecting a Change in the Busy State	46
Controlling Intermediate Update Map Redraw Operations	47
Handling Errors	47
Getting Error Codes	47
Checking for Incorrect Argument Types	48
Debugging an Application	48
Working with Map Layers, Map Features, and Printing	49
Overview	50
Working with Map Layers	50
Counting Map Layers	50
Listing Map Layers	51
Adding a Map Layer	53
Linking Map Layers	53
Toggling Map Layer Visibility On and Off	55
Working with Map Features	56
Getting Keys of Selected Map Features	56
Getting Coordinates of a Selected Map Feature	58
Invoking Select Radius Mode	61
Zooming In on Selected Features	61
Counting Map Features	62
Working with Printing	64
Setting the Print Priority	65
Enabling the Print Events	66
Positioning Page Elements with Page Coordinate System Units	67
Adding Custom Page Elements	68
Handling Events	69
Overview	70
Working with Event Handlers	70
Browser Differences	71
Event Observer Set Methods	71
Setting Up Event Handlers	72
Plug-In and Java Edition Event Handlers	72
ActiveX Control Event Handlers	75
Plug-In and ActiveX Control Event Handlers	75
VBScript Example	75
JavaScript Example	77
VBScript and JavaScript Example	78
Writing Event Handlers	78
Page Setup Event Handler Example	79
Print Event Handler Example	81
Plug-In Event Handler Example	83
Using Reports to Query and Update Data Sources	85
Overview	86
How Reports Are Generated	86
Specifying the Report Script	86
The Request	87
Launching the Report	87
Introducing ColdFusion and ASP	88
Creating Report Scripts with ColdFusion	89
Listing File Contents with ColdFusion	89
Setting Up the Query	90
Controlling the Output	90
Seeing the Results	90
Querying and Displaying Data via the Map with ColdFusion	92
Setting Up the Report in Autodesk MapGuide Author	92
Creating the Report Script	94
Creating an HTML Page to Display the Map	95
Seeing the Results	95
Redirecting Report Output	96
Adding a Button with the Viewer API	100
Modifying a Database via the Map with ColdFusion	102
Setting Up the Report in Autodesk MapGuide Author	103
Creating the Report Scripts	104
Creating an HTML Page to Display the Map	107
Creating a Custom Menu Item	107
Accessing Your Application with the Viewer API	108
Creating Report Scripts with ASP	109
Summary of ASP Objects, Components, and Events	110
Listing File Contents with ASP	111
Specifying a Scripting Language	112
Selecting Database Records	112
Controlling the Output	113
Seeing the Results	114
Querying and Displaying Data via the Map with ASP	115
Setting Up the Report in Autodesk MapGuide Author	116
Creating the Report Script	117
Creating an HTML Page to Display the Map	118
Seeing the Results	119
Redirecting Report Output	120
Adding a Button with the Viewer API	122
Modifying a Database via the Map with ASP	125
Setting Up the Report in Autodesk MapGuide Author	126
Creating the Report Scripts	127
Creating an HTML Page to Display the Map	131
Creating a Custom Menu Item	132
Accessing Your Application with the Viewer API	133
Applications	135
Overview	136
Custom Redlining Application	136
Redlining Example Code	137
Municipal Application	140
Municipal Application Example Code	141
Facility Management Application	156
Facilities Management Application Example Code	157
DWG Filtering Application	164
Understanding Layers in Autodesk MapGuide	165
Changing Map Layer Data Source Properties	165
DWG Filtering Application Example Code	166
Selection Changed Function (selChanged)	166
Show Properties Function (showProperties)	168
SDF Component Toolkit Applications	171
Updating SDF Files—an ASP Example	171
Converting to an SDF File—a Visual Basic Example	181
Getting SDF File Information—a Visual Basic Example	188
Copying an SDF File—a Visual Basic Example	196
Index	203
A	203
B	203
C	203
D	204
E	204
F	205
G	205
H	205
I	205
J	205
K	205
L	205
M	206
N	206
O	206
P	206
Q	207
R	207
S	207
U	207
V	207
W	208
X	208

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Accessing Secure Data

Map authors can control whether developers can use the

getVertices

and

getLayerSetup

methods to access coordinate values and/or map layer

setup data. Map authors control the security of this data from the Map Layer

Properties dialog box in Autodesk MapGuide Author. If map authors allow

access to the API, they can also stipulate that the application must send in a

specific passkey first. If you are building an application for a map that

requires a passkey to access the coordinate values and/or the layer setup data,

you will need to get the passkey from the map author and pass it in with the

unLock

method to enable the

getVertices

and

getLayerSetup

methods.

Remember that users can view any embedded scripts in HTML, so in some

cases you may not want to hard code your passkey in your Web page. To keep

the passkey secure, we recommend that you implement one of the following

techniques:

■

Create an application that includes one frame that displays the map only.

Be sure that the map fills up the entire frame. In this case, users will not

be able to view the source code of the frame that displays the map. You

can then hard code the passkey in the source code of that frame.

■

Write a Java applet that makes a request for the passkey to your Autodesk

MapGuide Server and then returns the passkey to the script in the Web

page. Call this applet in your embedded script after making sure that the

user has met your security criteria.

■

Write your entire Autodesk MapGuide Viewer application in a Java applet.

Handling Busy State and Map Refresh

This section describes the map busy state and the techniques for coordi-

nating when and how to refresh a displayed map. When Autodesk MapGuide

Viewer refreshes the map display, it can cause errors in your application

unless you take the correct steps to prevent them. You need to familiarize

yourself with the way that the Autodesk MapGuide Viewer API is designed so

you can understand how to code your application correctly.

About the Busy State

Autodesk MapGuide Viewer enters a busy state whenever it refreshes the

display, and the busy state does not end until the data has been received from

the server and the display is updated or refreshed.