Pitney-bowes MapXtreme Instrukcja Użytkownika Pobierz pdf (Strona 81)

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Chapter 5: Web Applications, Controls, and Tools

MapXtreme Web Controls and Tools

MapXtreme v7.1 81 Developer Guide

These JavaScript-enabled tools do not trigger a full page postback with each use. Typically, only the

image of the map is refreshed after each tool use. See Map Tools Architecture for an

understanding of this development model. See Managing Your Web Controls for information on

event handling, error management and state management.

Previous MapXtreme controls (pre-v6.5 releases) required a postback that called Page_Load and

Page_Unload every time a tool was used. These tools are provided for backward compatibility and

are not recommended for new development projects. See Migrating Post-back Web Controls to

JavaScript Web Controls.

Customizable

If the provided tools do not offer you the functionality to meet your needs, consider modifying them.

This can be as simple as changing a built-in tool property or as complicated as writing your own

JavaScript and server-side class to extend its functionality. Source code for the web controls and

tools is provided in the Samples\MapXtremeWebControlsSourceCode folder. See Creating a

Custom Tool.

MapXtreme provides an ASP.NET AJAX sample application that demonstrates how to use

Microsoft's ASP.NET AJAX controls in a MapXtreme web mapping application. See ASP.NET AJAX

and MapXtreme Web Applications.

Description of Web Controls and Tools

The following are the available MapXtreme Web controls and tools.

Web Controls Description

MapControl Allows you to display an instance of a Map object. Each Map object is

referred to by a MapAlias, such as Map1.

At runtime, the MapControl displays the map which is obtained from a

MapFactory by using the map’s MapAlias property. The map is drawn

by exporting the map image, and referencing this image in the HTML

<img> tag. If the MapAlias property is not specified or is invalid, the first

map from the MapFactory is chosen. Set the MapControl MapAlias

property at design time.

LayerControl Allows you to display map feature layers and label layers in a tree view

structure. This control can turn the visibility on or off for a particular layer

and displays a read-only current zoom value. The visibility changes are

persistent only for the active life of the application using the

LayerControl.

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