一、HTML VIEWER简介：
1。默认的HTML VIEWER由一组HTML页和JS文件(JavaScript)组成，这些HTML页和JS文件由ArcIMS Designer定制生成。
2。对于HTML Viewer，我们所做的功能扩展可以包括：
* 改变框架布局
* 修改工具条
* 增加自己的功能
* 改变图形外观
* 插入自己的图标
3。ArcIMS Designer定制的网站默认在Web容器的home目录的\default-web-app\Website 目录下
二、HTML Viewer文件结构：
1。由一组HTML文件，一个参数文件ArcIMSparam.js及两个目录--JavaScript和images组成。
站点目录
|
| HTML Pages
| ArcIMSparam.js
|
|---- JavaScript目录//包含JavaScript函数库，定义了用户可操作的地图功能，包括了HTML Viewer的大部分操作 。
| //可以通过定制这些JavaScript程序为自己的工具按扭增加功能。如热连接等。
|---- images 目录 //包含用于页面上按钮，图标及标记的显示。当新建站点时，可以用自己的标志代替这些原有的影像
2。ArcIMSparam.js与HTML Pages
HTML Viewer的一个重要的参数文件是位于站点目录下的ArcIMSparam.js文件。这个文件包含了一组影响站点外观和工作方式的JavaScript变量。对HTML Viewer大部分的定制都可以通过改变这些变量 的值来完成。ArcIMSparam.js包含的主要变量可以用来
* 改变所用的地图服务和地图范围
* 设置图例的初始化显示
* 定义acetate层的指北针，版权文字
* 定义属性字段的显示
* 改变工具和工具条
HTML Viewer默认入口是Default.htm。它的处理了四个任务
1>创建页面标题，
2>确定所用的浏览器类型，
3>建立URL解析规则
4>生成用于定义页面布局框架的viewer.htm文件。
Viewer.htm定义了HTML Viewer的结构，而不是内容，他将浏览器划分为多个区域。每个区域通过HTML文件获得内容。其他的HTML文件则为框架添加内容。
一般关系如下：
先装入MapFrame.html于MapFrame中，再由MapFrame打开TocFrame其中装入toc.htm，所以在toc.htm用MapFrame的内容时，
var t;
if(opener){
t=opener.parent.MapFrame;
}else{
t=parent.MapFrame;
}
因为，MapFrame.html包含了aimsCustom.js、aimsXML.js、ArcIMSparam.js，因而将添加的函数放入aimsCustom.js（包括构造发送XML的函数和处理XML的函数useCustomFunction）后在各自框架中调用MapFrame中新加的函数！
以添加定位功能为例，一般是在aimsCustom.js中加入函数，如function addressLocation(x,y,name)
其中先保存上一幅地图的范围，再调用sendMapXML()获得新地图
发送request
saveLastExtent()
Arguments:
None
Returned Value:
None
Description:
Function that saves the last map extent.
Uses: eLeft, eRight, eTop, and eBottom.
Called by: displayAttributeData in aimsIDentify.js; fullExtent, startExtent, zoomToPoint,
zoomToEnvelope, zoomScale, zoomButton, and panButton in aimsMap.js;
ovMapClick, zoomin, zoomout, stopZoomBox, stopZoomOutBox, stopPan, and pan in
aimsNavigation.js; and showHighlight in aimsSelect.js.
Sets: lastLeft, lastRight, lastTop, and lastBottom.
File:
aimsMap.js
Syntax:
sendMapXML()
Arguments:
None
Returned Value:
None
Description:
Sends an ArcXML request to obtain a new map image to the MapServer.
会用到的变量为: debugOn and imsURL.
Calls: beforeMapRefresh and showRetrieveMap in aimsMap.js and writeXML and sendToServer in
aimsXML.js.
Called by: bufferIt in aimsBuffer.js; clickFunction in aimsClick.js; processStartExtent in
aimsCommon.js; parseGeocodeResults in aimsGeocode; displayAttributeData in
aimsIDentify.js; fullExtent, startExtent, zoomBack, zoomToPoint, zoomToEnvelope,
zoomScale, zoomButton, and panButton in aimsMap.js; ovMapClick, zoomin, zoomout,
stopZoomBox, stopZoomOutBox, stopPan, and pan in aimsNavigation.js; showHighlight
in aimsSelect.js; and process XML in aimsXML.js.
在aimsXML.js文件中的sendMapXML()函数内容为：
function sendMapXML() {
beforeMapRefresh();
showRetrieveMap();
var theText = writeXML();
if (debugOn==2) alert(msgList[12] + theText);
sendToServer(imsURL,theText,1);
}
其中：writeXML()写出对新地图的request XML,要修改就对writeXML()进行修改
writeXML()
Arguments:
None
Returned Value:
String ArcXML request string to be sent to the ImageServer.
Description:
Writes an ArcXML request for a new map image. This is the default request sent for a main map display image.
用到的变量为: eLeft, eRight, eTop, eBottom, iHeight, iWidth, aimsLayersPresent, toggleVisible, layerCount,
aimsClassRenderPresent, mapBackColor, aimsLegendPresent, legendVisible, aimsBufferPresent,
showBuffer, aimsSelectPresent, showGeocode, geocodeX, geocodeY, geocodePointColor,
geocodePointSize, geocodeLabel, aimsClickPresent, clickCount, selectColor, clickType,
clickMarkerColor, clickMarkerType, clickMarkerSize, aimsCustomPresent, drawCopyright,
CopyrightCoords, CopyrightText, CopyrightStyle, CopyrightSize, CopyrightFont, CopyrightColor,
CopyrightBackground, CopyrightBGColor, CopyrightGlow, CopyrightGlowColor, drawNorthArrow,
NorthArrowType, NorthArrowSize, NorthArrowCoords, NorthArrowAngle, drawScaleBar,
ScaleBarbackColor, ScaleBarFont, ScaleBarStyle, ScaleBarColor, MapUnits, scalebarFontColor,
ScaleBarUnits, ScaleBarPrecision, ScaleBarSize, ScaleBarWidth, drawModeOnMap, modeBlurb,
modeMapColor, and modeMapGlow and LayerVisible, LayerID, clickPointX, and clickPointY arrays.
Calls: addSpecialRenderToMap in aimsClassRender.js (custom sample); addBufferToMap in aimsBuffer.js;
addLegendToMap in aimsLegend.js; addCustomToMap1, addCustomToMap2, addCustomToMap3,
and addCustomToMap4 in aimsCustom.js; addSelectToMap in aimsSelect.js; and getScaleBarDistance
in aimsMap.js.
Called by: clickAddPoint, resetClick, and deleteClick in aimsClick.js; getLegend in
aimsLegend.js; getPrintMap in aimsPrint.js; clearSelection in aimsSelect.js; and
sendMapXML and justGetMap in aimsXML.js.
File:
aimsXML.js
其中sendMapXML()函数最后调用：
sendToServer(URLString,XMLRequest,theType)
Arguments:
URLString -- String containing service URL for request.
XMLRequest -- String containing ArcXML request.
theType -- Numeric representing mode number to be passed to XMLMode. Used by processXML in passing ArcXML response to appropriate function for processing.
Returned Value:
None
Description:
Used to pass ArcXML requests on to the server(s). This function updates the form in the PostFrame page
(jsForm.htm) with the current request and processing function name.
Calls: showRetrieveMap, hideRetrieveMap, and hideRetrieveData in aimsMap.js.
Called by: functions sending ArcXML requests to the server(s).
File:
aimsXML.js
////////////////////////////////////////////////////////////////////////
// aimsCustom.js
// 缺省生成的aimsCustom.js是添加用于定制函数的模版
////////////////////////////////////////////////////////////////////////
//***************************************地址匹配函数******************************************
/*
* 函数名 addressLocation
* 描 述 在地图上显示地址匹配坐标点
* 参数说明 x,y：地址匹配坐标点的地图坐标
* name ：地址匹配点的地图标识
* 返回结果 无
* 使用的公共变量 limitRight limitLeft limitTop limitBottom selectPointMargin
*
* aimsMap.js中的
* eLeft (Numeric/Dynamic) Current extent left (minimum x-coordinate).
* Formerly called left.
* eRight (Numeric/Dynamic) Current extent right (maximum x-coordinate).
* Formerly called right.
* eTop (Numeric/Dynamic) Current extent top (maximum y-coordinate).
* Formerly called top.
* eBottom (Numeric/Dynamic) Current extent bottom (minimum y-coordinate).
* Formerly called bottom.
* showGeocode (Boolean/Dynamic) If true, map request will include
* command to draw point at geocodeX, geocodeY
* with an optional label. Updated by viewer on
* response of address match request or
* zoomToPoint() function.
* geocodeX (Numeric/Dynamic) Geocode point x-coordinate. Updated by
* viewer on address match response or
* by zoomToPoint().
* geocodeY (Numeric/Dynamic) Geocode point y-coordinate. Updated by
* viewer on address match response or
* by zoomToPoint().
* 调 用 sendMapXML（aimsXML.js）
* 被调用
*/
function addressLocation(x,y,name){
legendVisible=false;
hasTOC=false;
var mWMargin = 0;
var mHMargin = 0;
mWMargin = Math.abs(limitRight-limitLeft) * (selectPointMargin/10);
mHMargin = Math.abs(limitTop-limitBottom) * (selectPointMargin/10);
saveLastExtent();
eLeft = parseFloat(x) - parseFloat(mWMargin);
eRight = parseFloat(x) + parseFloat(mWMargin);
eTop = parseFloat(y) + parseFloat(mHMargin);
eBottom = parseFloat(y) - parseFloat(mHMargin);
showGeocode=true;
geocodeX=x;
geocodeY=y;
geocodeLabel=name;
sendMapXML();
}
/*****************************************************************************
* aimsXML.js
* send the created xml request to map server
*/
function sendMapXML() {
// ask for the Main map
//window.onerror=clearError;
beforeMapRefresh();
//window.onerror=resetError;
showRetrieveMap();
var theText = writeXML();
if (debugOn==2) alert(msgList[12] + theText);
//alert(theText);
//hasTOC=false;
sendToServer(imsURL,theText,1);
}
/*****************************************************************************
*function writeXML()
接收response
processXML(theReplyIn)
Arguments:
theReplyIn--String containing returned ArcXML response.
Returned Value:
None
Description:
Passes the ArcXML response to the appropriate function for processing. The key global is XMLMode,which determines which function to call，即设定XMLMode就可以决定processXML(theReplyIn)调用哪个分析response XML的函数。
Calls: appropriate function to parse ArcXML response.
Called by: passXML in dynamic connector-created page in PostFrame on loading.
File:
aimsXML.js
全局变量XMLMode的值<1000，由processXML(theReplyIn)调用其默认函数，>1000即用户自定义时，processXML(theReplyIn)调用useCustomFunction()函数。全局变量XMLMode在aimsXML.js中定义（见Customizing ArcIMS: HTML Viewer第308<315>页）。
useCustomFunction(theReply)
Arguments:
theReply String containing returned ArcXML response.
Returned Value:
None
Description:
Available for custom processing of returned ArcXML responses. The function processXML will call this function if the value of the global XMLMode is 1,000 or greater.
Uses: XMLMode.
Calls: hideLayer in aimsDHTML.js.
Called by: processXML in aimsXML.js.
File:
aimsCustom.js
