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DWG Filtering Application Example Code, Selection Changed Function (selChanged)

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DWG Filtering Application Example Code This example illustrates some basic tasks an application can perform when working with DWG data. It primarily focuses on setting DWG filters and getting DWG data, but it can easily be modified to change other Autodesk MapGuide map layer properties, such as the DWG file, the DWG data source, and so on. In this example, DWG processing is performed on a map with a single Autodesk MapGuide map layer called Floor Plan. Processing is performed by two functions: selChanged() and showProperties(). The operational flow of these functions is described in the following sections. To see the full source code for this example, choose Help ➤ Contents ➤ Examples Advanced ➤ Filter DWG Layers in the Autodesk MapGuide Viewer API Help. When the application loads, click the view source link in the right frame. Selection Changed Function (selChanged) The following are excerpts from the selChanged() function. This function is called when a user selects or deselects one or more DWG filters from a list box displayed on the map page. This function sets the layer filter of the DWG map layer to layers selected by the user. The basic operational flow of this function is as follows: 1 Use the getMap function, the current map is assigned to the variable map. 2 Use the map.getMapLayer method to get the map's single map layer named Floor Plan. Assign the map layer to a variable called mapLayer. 3 Get the DWG data source object for the layer by first getting the layer setup using mapLayer.getLayerSetup, and then using the layer setup to get the DWG data sources object of the layer using mapLayerSetup.getDwgDataSources. 4 Use map.createObject("MGCollection")to create a collection object called mapDwgLayerFilters. This object will hold filters selected by the user from the filters list box. 5 Iterate through list box selections and add each to the collection object mapDwgLayerFilters. 6 Create a comma-delimited string named filterList containing selected filters. Note that the setLayerFilter method used next expects a comma-delimited string of filters. 166 | Chapter 7 Applications

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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166

Chapter 7

Applications

DWG Filtering Application Example Code

This example illustrates some basic tasks an application can perform when

working with DWG data. It primarily focuses on setting DWG filters and

getting DWG data, but it can easily be modified to change other Autodesk

MapGuide map layer properties, such as the DWG file, the DWG data source,

and so on.

In this example, DWG processing is performed on a map with a single

Autodesk MapGuide map layer called

Floor Plan

. Processing is performed

by two functions:

selChanged()

and

showProperties()

. The operational

flow of these functions is described in the following sections. To see the full

source code for this example, choose Help

➤

Contents

➤

Examples Advanced

➤

Filter DWG Layers in the

Autodesk MapGuide Viewer API Help

. When the

application loads, click the view source link in the right frame.

Selection Changed Function (selChanged)

The following are excerpts from the

selChanged()

function. This function

is called when a user selects or deselects one or more DWG filters from a list

box displayed on the map page. This function sets the layer filter of the DWG

map layer to layers selected by the user. The basic operational flow of this

function is as follows:

Use the

getMap

function, the current map is assigned to the variable

map

Use the

map.getMapLayer

method to get the map

’

s single map layer

named

Floor Plan

. Assign the map layer to a variable called

mapLayer

Get the DWG data source object for the layer by first getting the layer

setup using

mapLayer.getLayerSetup

, and then using the layer setup

to get the DWG data sources object of the layer using

mapLayerSetup.getDwgDataSources

Use

map.createObject("MGCollection")to

create a collection object

called

mapDwgLayerFilters

. This object will hold filters selected by the

user from the filters list box.

Iterate through list box selections and add each to the collection object

mapDwgLayerFilters.

Create a comma-delimited string named

filterList

containing selected

filters. Note that the

setLayerFilter

method used next expects a

comma-delimited string of filters.