[OpenLayers-Users] getting GeoJSON features in my search
Gery .
gamejihou at hotmail.com
Sat Sep 29 04:57:43 PDT 2012
Hello Bart and all the list,
about the search function I want to implement in my app, I found this procedure in the GIS forum (http://gis.stackexchange.com/questions/11167/search-functionality-in-openlayers-geoserver)
*******************
If you don't have GeoServer 2.1:
Get the name of the feature with Javascript/OpenLayers,pass the name asynchronously to a php script on the server,the php script will query the database directly for the st_envelope or st_box2d of the feature with that name (select st_envelope(the_geom) from table where name ilike passed_parameter),the php script returns the extent/bounding box of the feature which is used in Javascript/OpenLayers to zoom the map.
You'll have to parse the st_envelope result into something that
OpenLayers understands. You also might want to add a little buffer to
the zoom extent. You can add this manually or use st_expand instead of
st_envelope.********************************
this meets what I want because I dont use Geoserver. I also posted my question in this forum, the link is here. Im sure Im missing something obvious and not easy for a new user like me. I dont want that someone else that does this for me, I just ask for some support in oder to understand and keep working on this because Im stuck. Based on the code I posted in the previous link, I think points 1 and 4 above are working, 3 and 4 are the real problem, especially the "passed parameter" needed by the postgis geojson.php script Im using.
BTW Bart, it seems that the there is something wrong with the link you sent me, I downloaded both the HTML and JS, but I got an error in Firebug and the map doesnt appear, something about "e" and the gx geocodercombo, it doesnt run on my PC, that was weird, but if I change that one for textfield or combo, the map appears but the search button doesnt allow me to search anything, I will keep trying on that one.
Thanks to all for any replies,
Best regards,
Gery
__________________________________________________________________________________________
Piensa en el medio ambiente - mantenlo en la pantalla. NO lo imprimas si NO es necesario.
Think green - keep it on the screen. Do NOT print if it is NOT necessary.
Denken Sie an die Umwelt - bewahren Sie es auf dem Bildschirm. Drucken Sie NICHT, wenn es NICHT notwendig ist.
Subject: Re: [OpenLayers-Users] getting GeoJSON features in my search
From: bartvde at opengeo.org
Date: Thu, 27 Sep 2012 17:00:51 +0200
CC: openlayers-users at lists.osgeo.org
To: gamejihou at hotmail.com
Maybe this well help you:
http://dev.geoext.org/geoext/trunk/geoext/examples/geocoder-geonames.html
Best regards,Bart
--
Bart van den Eijnden
OpenGeo - http://opengeo.org
Expert service straight from the developers.
On Sep 27, 2012, at 4:49 PM, Gery . <gamejihou at hotmail.com> wrote:
Hello, after several days checking on google I've found no examples to keep working on this, I'd appreciate if someone could point me to some examples, the problem is basically that the whole GeoJSON output is passed to OL no matter what I write in the search button, I don't get that part, I'd appreciate some support on this, thank you.
From: gamejihou at hotmail.com
To: openlayers-users at lists.osgeo.org
Subject: getting GeoJSON features in my search
Date: Tue, 25 Sep 2012 22:32:12 +0000
After googleing for a while and reading the OL documentation, I don't understand well how the filterToParams in OpenLayers.HTTP protocol should work, what I'm trying to do is to get the GeoJSON features that matches my search using the following code:
[code]
Ext.onReady(function() {
var map = new OpenLayers.Map();
var osm = new OpenLayers.Layer.OSM(
"OSM"
);
map.addLayer(osm);
var mappanel = new GeoExt.MapPanel({
region:"center",
height: 400,
width: 600,
map: map,
title: 'A Simple GeoExt Map'
});
var layerList = new GeoExt.tree.LayerContainer({
text: 'All Layers',
layerStore: mappanel.layers,
leaf: false,
expanded: true
});
var layerTree = new Ext.tree.TreePanel({
title: 'Map Layers',
maxWidth: 500,
region: "east",
collapsible: true,
collapsed: true,
root: layerList
});
var features = [];
var vecLayer = new OpenLayers.Layer.Vector("Results");
var select = new GeoExt.grid.FeatureSelectionModel();
// define the data source
var protocol = new OpenLayers.Protocol.HTTP({
url: 'http://localhost/postgis_geojson.php?geotable=boreholes_point_wgs84&geomfield=geom',
/* params: {
outputFormat: "json"
},
filterToParams: function (filter, params) {
if (filter.type === name)
return params;
},*/
format: new OpenLayers.Format.GeoJSON({
ignoreExtraDims: true,
'internalProjection': new OpenLayers.Projection("EPSG:900913"),
'externalProjection': new OpenLayers.Projection("EPSG:4326")
})
});
/* protocol.read({
callback: function(r){
console.log("received featured: " + r.features);
}
});*/
formPanel = new GeoExt.form.FormPanel({
title: "Place Name Search",
height: 150,
region: "north",
protocol: protocol,
items: [{
xtype: "textfield",
width: 200,
name: "station__like",
fieldLabel: "station <br />(use * and . for wildcards)",
allowBlank: false,
minLength: 1
}],
listeners: {
actioncomplete: function(form, action) {
features = action.response.features;
store.loadData(features);
vm=map.getLayersByName("Results");
if(vm.length===0){
vecLayer = new OpenLayers.Layer.Vector("Results");
map.addLayer(vecLayer);
store.bind(vecLayer);
select.bind(vecLayer);
}
}
},
buttons: [{text: 'search',
handler: function(){
formPanel.search();
}
}],
keys: [{ key: [Ext.EventObject.ENTER],
handler: function() {
formPanel.search();
}
}]
});
var cols = [ {name: 'station', type: 'string'},
{name: 'survey', type: 'string'},
{name: 'type', type: 'string'},
{name: 'w_depth_m', type: 'float'},
{name: 'comments', type: 'string'},
{name: 'latitude', type: 'float'},
{name: 'longitude', type: 'float'}
];
var reader = new GeoExt.data.FeatureReader({},cols);
var store = new GeoExt.data.FeatureStore({
reader: reader,
fields: cols,
autoLoad: false
});
// create grid panel configured with feature store
gridPanel = new Ext.grid.GridPanel({
title: "Results",
height: 500,
region:"center",
store: store,
columns: [{
header: "Station",
width: 100,
sortable: true,
dataIndex: "station"
}, {
header: "Survey",
width: 40,
sortable: true,
dataIndex: "survey"
}, {
header: "Type",
width: 40,
sortable: true,
dataIndex: "type"
}, {
header: "Water depth [m]",
width: 40,
sortable: true,
dataIndex: "w_depth_m"
}, {
header: "Comments",
width: 100,
align: 'right',
sortable: true,
dataIndex: "comments"
}],
sm: select
});
gridPanel.on('rowdblclick', function(g,rowIdx,r){
rec = store.getAt(rowIdx);
map.setCenter(
new OpenLayers.LonLat(
rec.get('longitude'),
rec.get('latitude')),
10);
});
searchPanel = new Ext.Panel({
layout: "border",
region: "west",
collapsible: true,
width: 400,
items: [formPanel,gridPanel]
});
mainPanel = new Ext.Panel({
height: 600,
renderTo: "mainpanel",
layout: "border",
items: [searchPanel,mappanel,layerTree]
});
});
[/code]
thanks to Eric Lemoine I understand that the PHP script I'm using for the postgis request (update https://gist.github.com/3763701), should allow filtering the features I'm looking for (ie.WHERE ... LIKE ...). This script has a "parameters" option that should give this but so far it only throws an error.
Sorry for probably this very simple question but I'm just starting using GeoJSON and protocol.HTTP, I'd appreciate your support, thanks,
Gery
__________________________________________________________________________________________
Piensa en el medio ambiente - mantenlo en la pantalla. NO lo imprimas si NO es necesario.
Think green - keep it on the screen. Do NOT print if it is NOT necessary.
Denken Sie an die Umwelt - bewahren Sie es auf dem Bildschirm. Drucken Sie NICHT, wenn es NICHT notwendig ist.
_______________________________________________
Users mailing list
Users at lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/openlayers-users
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/openlayers-users/attachments/20120929/eee3b0ee/attachment-0001.html>
More information about the Users
mailing list