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tion and assign it to a variable called, The second statement operates on

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Next, the doGetKey function calls the getMapObjectsEx method and passes its return value (a collection of the selected map features) to a variable called objs. Note that if you use getMapObjectsEx with a map layer, it returns an MGCollection object made up of map features of a map layer, but by using the method with the selection object, and by passing it null as a parameter, it returns the map features in the current selection only: var objs = sel.getMapObjectsEx(null); Then the function calls the MGCollection.size method, which returns a count of the objects in the collection; that number is assigned to the cntObjects variable: var cntObjects = objs.size(); After that, doGetKey uses a for loop to cycle through the feature collection, placing all of the feature names in a single msg variable: // variable to hold feature names var msg = "Keys of selected features are:\n"; var i; // loop counter variable for (i = 0; i < cntObjects; i++) // iterate from 0 to cntObjects { var obj = objs.item(i); var key = obj.getKey(); msg = msg + obj.getMapLayer().getName() + " " + key + "\n"; } The cntObjects variable tells the for loop to iterate once for each object. At each iteration, the loop counter variable (i) is incremented and the following statements are processed: var obj = objs.item(i); var key = obj.getKey(); msg = msg + obj.getMapLayer().getName() + " " + key + "\n"; The first statement uses the item method to select an object from the collection and assign it to a variable called obj. The second statement operates on the obj variable, first using the getKey method to obtain the key of the feature represented by that variable, and then assigning that name to the msg variable. The last line puts it all together by concatenating the previous contents of msg, a layer name obtained by the getName method, a space character, the contents of key, and a JavaScript newline. After all selected features have been added to msg, the contents of the variable are displayed in a JavaScript alert box: alert(msg); Working with Map Features | 57

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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Working with Map Features

Next, the

doGetKey

function calls the

getMapObjectsEx

method and

passes its return value (a collection of the selected map features) to a variable

called

objs

. Note that if you use

getMapObjectsEx

with a map layer, it

returns an

MGCollection

object made up of map features of a map layer, but

by using the method with the selection object, and by passing it null as a

parameter, it returns the map features in the current selection only:

var objs = sel.getMapObjectsEx(null);

Then the function calls the

MGCollection.size

method, which returns a

count of the objects in the collection; that number is assigned to the

cntObjects

variable:

var cntObjects = objs.size();

After that,

doGetKey

uses a

for

loop to cycle through the feature collection,

placing all of the feature names in a single

msg

variable:

// variable to hold feature names

var msg = "Keys of selected features are:\n";

var i; // loop counter variable

for (i = 0; i < cntObjects; i++) // iterate from 0 to cntObjects

{

var obj = objs.item(i);

var key = obj.getKey();

msg = msg + obj.getMapLayer().getName() + " " + key + "\n";

}

The

cntObjects

variable tells the

for

loop to iterate once for each object.

At each iteration, the loop counter variable (

) is incremented and the

following statements are processed:

var obj = objs.item(i);

var key = obj.getKey();

msg = msg + obj.getMapLayer().getName() + " " + key + "\n";

The first statement uses the

item

method to select an object from the collec-

tion and assign it to a variable called

obj

The second statement operates on the

obj

variable, first using the

getKey

method to obtain the key of the feature represented by that variable, and

then assigning that name to the

msg

variable. The last line puts it all together

by concatenating the previous contents of

msg

, a layer name obtained by the

getName

method, a space character, the contents of

key

, and a JavaScript

newline. After all selected features have been added to

msg

, the contents of

the variable are displayed in a JavaScript

alert

box:

alert(msg);