DHTML rubber-band box
Ethan Alpert
ealpert at DIGITALGLOBE.COM
Thu Nov 10 15:34:02 PST 2005
Check your webserver logs and look at the URL it's submitting...Copy
that and in a browse use it changing mode=browse to mode=map...If
nothing displays then you most likely have your projection or extents
wrong. This is how I initially figured out how to debug what was going
on in the dhtml example.
-e
-----Original Message-----
From: UMN MapServer Users List
[mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On Behalf Of Jennifer A Bennett
Sent: Thursday, November 10, 2005 2:57 PM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: [UMN_MAPSERVER-USERS] DHTML rubber-band box
I am trying to copy the code for the DHTML rubber-band box from
the Itasca Demo and cannot get it to show my map.
I am wondering what other code I must copy or change to make
this work?
I am able to get the gist of the Javascript code, but I am not
familiar enough to write new code.
So far I have copied the Javascript folder and most of the
graphics from the Graphics folder into my drive.
I have copied and inserted the portion of code below from the
(Itasca) index.html into my index.html file.
<!-- EDIT THE FORM ACTION -->
<form name="watershed_main" method="GET"
action="/cgi-bin/mapserv.exe">
<input type="hidden" name="layer" value="major_basins">
<input type="hidden" name="layer" value="county">
<input type="hidden" name="layer" value="MajRds">
<input type="hidden" name="zoomsize" value=2>
<!-- EDIT THESE HIDDEN VARIABLES -->
<input type="hidden" name="map"
value="d:/webData/watershed/major_basins.map">
<input type="hidden" name="program"
value="/cgi-bin/mapserv.exe">
<input type="hidden" name="root"
value="http://sr08dmnspl/watershed">
<input type="hidden" name="map_web_imagepath"
value="./tmp/">
<input type="hidden" name="map_web_imageurl"
value="http://sr08dmnspl/watershed/tmp/">
<input type="submit" value="Start Application"></center>
I have also copied the code below from the
itasca_adds_dhtml.html file and placed it into my file called
watershed_main.html
Here is my watershed_main.html code
<!-- watershed_main.html
This is the start of the interactive major watershed map. -->
<html>
<head>
<title>Interactive Major (HUC Level 4) Web Page</title>
<!-- the DHTML JavaScript library includes -->
<script type="text/javascript"
src="../watershed/javascript/cbe/cbe_core.js"></script>
<script type="text/javascript"
src="../watershed/javascript/cbe/cbe_event.js"></script>
<!-- MapServer specific JavaScript library includes -->
<script language="javascript"
src="../watershed/javascript/mapserv.js"></script>
<script language="JavaScript"
src="../watershed/javascript/dbox.js"></script>
<!-- utility library -->
<script language="JavaScript"
src="../watershed/javascript/utils.js"></script>
<!-- scripting specific to the application -->
<script language="javascript">
// first, nab any arguments passed to this page (so we don't
have to edit the page)
var args = getargs();
// the DHTML main mapping window (note the significance of the
name "main" here and with the Mapserv object)
var main = new dBox("main",600, 600, "#FF0000", 2);
// main.verbose = true;
// the DHTML reference map window
var reference = new dBox("reference", 120, 120, "#989898", 1);
reference.box = false;
reference.cursorsize = 0;
// mapserv.js global variables
var MapServer = args.program;
var QueryServer = MapServer;
var Interface = "dhtml";
// create the Mapserv object
var ms = new Mapserv("main", args.map, 149599, 4782069,
767075, 5483304, 600, 600);
ms.minscale = 1000;
ms.maxscale = 1550000;
// layer definitions
ms.layers[ms.layes.length] = new layer ('major_basins','Major
Basins','layers',true, null, null)
ms.layers[ms.layers.length] = new Layer('county', 'Counties',
'layers', false, null, null);
ms.layers[ms.layers.length] = new Layer('MajRds', 'Major
Roads', 'layers', false, null, null);
ms.buildlayers();
// add the reference map
ms.referencemap = new Mapserv("reference", args.map,
393234.393701263, 5205405.16440722, 495769.579718949, 5307959.02579127,
120, 120);
//
// Extensions to Mapserv.draw(): this allows you to exend the
capabilties of
// of the default draw method. There are post and pre draw
functions available.
//
function predraw() {
// clear any query results
top.query_frame.location.href='watershed_main.html';
// update the scalebars
document.scalebar_miles.src = MapServer + "?map=" +
ms.mapfile + "&mode=scalebar&mapext=0+0+" + (ms.extent[2] -
ms.extent[0]) + "+" + (ms.extent[3] - ms.extent[1]) + "&mapsize=" +
ms.width + "+" + ms.height;
document.scalebar_kilometers.src = MapServer + "?map=" +
ms.mapfile + "&map_scalebar_units=kilometers&mode=scalebar&mapext=0+0+"
+ (ms.extent[2] - ms.extent[0]) + "+" + (ms.extent[3] - ms.extent[1]) +
"&mapsize=" + ms.width + "+" + ms.height;
// update the legend
document.legend.src = MapServer + "?map=" + ms.mapfile +
"&mode=legend&layers=" + ms.layerlist;
reference.sync();
}
//
// Functions that are called by the jBox applet or the dBox
javascript code:
// basically these provide the gateway from the applet/layers
to the rest of
// the application. Note that they are the same regardless of
implementation.
//
// Bottom line: you may want to swipe some of this code.
//
// jBox/dBox errors are passed to the browser via this
function
function seterror_handler(name, message) { alert("Component "
+ name + " error: " + message); }
// allows jBox/dBox to reset without redrawing
function reset_handler(name, minx, miny, maxx, maxy) { }
// called from jBox/dBox when the user initiates change
function setbox_handler(name, minx, miny, maxx, maxy) {
if(name == 'reference') {
ms.applyreference(minx, miny);
ms.draw();
} else {
if(ms.mode == 'map') {
if(minx != maxx && miny != maxy)
ms.applybox(minx, miny, maxx, maxy);
else
ms.applyzoom(minx, miny);
ms.draw();
} else if(ms.mode != 'map') {
ms.applyquerybox(minx, miny, maxx, maxy); // these just
set members
ms.applyquerypoint(minx, miny);
ms.query(); // builds query URL
top.query_frame.location.href = ms.url;
}
}
}
// various event handlers called by jBox/dBox
function mousemove_handler(name, x, y) {
window.status = "UTM Coordinates: x=" +
Math.round(Number(ms.extent[0] + x*ms.cellsize)) + " and y=" +
Math.round(Number(ms.extent[3] - y*ms.cellsize));
}
function mouseexit_handler(name) { window.status = ""; }
function mouseenter_handler(name) { window.status = ""; }
// page initialization function
function windowOnload() {
main.initialize();
reference.initialize();
ms.zoomdir=1;
ms.draw();
}
</script>
<p align="center">Interactive Major (HUC Level 4) Web Page</p>
</b></font>
<hr>
<table border=0 cellpadding=5>
<tr>
<td align=center valign="top">
<table width="390" border="0" cellspacing="0" cellpadding="0"
align="center" bgcolor="#666666">
<tr>
<td align="right" width="18"><a
href="javascript:ms.pan('nw')"><img src="../watershed/images/nw.gif"
width="18" height="18" border="0" alt="pan northwest"></a></td>
<td align="center"><a href="javascript:ms.pan('n')"><img
src="../watershed/images/n.gif" width="23" height="18" border="0"
alt="pan north"></a></td>
<td align="left" width="18"><a
href="javascript:ms.pan('ne')"><img src="../watershed/images/ne.gif"
width="18" height="18" border="0" alt="pan northeast"></a></td>
</tr>
<tr>
<td align="right" width="18"><a
href="javascript:ms.pan('w')"><img src="../watershed/images/w.gif"
width="18" height="23" border="0" alt="pan west"></a></td>
<td align="center" bgcolor="#cccccc">
<!-- this is the holding spot (the anchor) for the map
-->
<DIV id="main_anchor" style="position:relative;
visibility:visible; width:100%; height:100%; left:0px; top:0px;"><IMG
src="../watershed/images/red_pixel.gif" height="600" width="600"></DIV>
<!-- absolutely positioned layer to hold the map -->
<DIV id="main" style="position:absolute;
visibility:visible; width:100%; height:100%;
clip:rect(100%,100%,100%,100%); background:transparent;"><IMG
name="main" src="../watershed/images/transparent_pixel.gif" height="600"
width="600"></DIV>
</td>
<td align="left" width="18"><a
href="javascript:ms.pan('e')"><img src="../watershed/images/e.gif"
width="18" height="23" border="0" alt="pan east"></a></td>
</tr>
<tr>
<td align="right" width="18"><a
href="javascript:ms.pan('sw')"><img src="../watershed/images/sw.gif"
width="18" height="18" border="0" alt="pan southwest"></a></td>
<td align="center"><a href="javascript:ms.pan('s')"><img
src="../watershed/images/s.gif" width="23" height="18" border="0"
alt="pan south"></a></td>
<td align="left" width="18"><a
href="javascript:ms.pan('se')"><img src="../watershed/images/se.gif"
width="18" height="18" border="0" alt="pan southeast"></a></td>
</tr>
<tr><td bgcolor="#666666" colspan="3">
<img name="scalebar_kilometers" align="right"
title="scalebar (km)" alt="scalebar (km)"
src="../watershed/images/white_pixel.gif">
<img name="scalebar_miles" title="scalebar (mi)"
alt="scalebar (mi)" src="../watershed/images/white_pixel.gif">
</td></tr>
</table>
<td valign=top>
<p align="left">
<font size=+2 face=arial,helvetica><b>MAP
CONTROLS</b></font>
<hr>
<br>
<!-- Note that we don't have a submit action for this form,
we only need the form for some controls -->
<form name="mapserv" action="javascript:void(0)">
<p><b>Choose an Action: </b><br>
<input onClick="ms.mode='map'" type="radio" name="mode"
checked> Browse map<br>
<input onClick="ms.mode='query'" type="radio"
name="mode"> Query feature<br>
<input onClick="ms.mode='nquery'" type="radio"
name="mode"> Query multiple features
<!--<font size=+1 face=arial,helvetica>Layers</font>-->
<br>
<p><b>Select Layers to Display: </b><br>
<select multiple name="layers" size=3
onChange="ms.togglelayers(this)">
<option value="county"> Counties
<option value="MajRds"> Major Roads
</select>
<br>
<p><b>Zoom Controls: </b><br>
<input onClick="ms.zoomdir=1" type=radio name=zoomdir
checked>Zoom In<br>
<input onClick="ms.zoomdir=0" type=radio
name=zoomdir>Pan<br>
<input onClick="ms.zoomdir=-1" type=radio
name=zoomdir>Zoom Out
<p>
Zoom Size <input type=text name=zoomsize size=4 value=2
onChange="ms.zoomsize=this.value">
</td>
</tr></table>
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