[OpenLayers-Users] GetFeature VS MapScript generated csv file

[Eric Lemoine]

Hi. What do you mean when you say your php service does return
anything and just create a file? Do you mean your service just creates
a file on the file system? Really it should send the text in the
response, so that you can most probably replace OpenLayers.Format.GML
with OpenLayers.Format.Text and i'll just work. I'm hoping i've
understood your question correctly. Eric

2008/8/15, Alexandre Dube <adube at mapgears.com>:
> Hi all,
>
>     In my application, I dynamically build a <select> element with
> cities as options using a GetFeature request and reading from GML format
> to generate it.
>
>     It works perfectly but is kinda slow because of the size of the GML
> format.  A dev and friend of mine suggested that I should generate my
> own text file using phpMapScript.  It was quite easy to do and works
> perfectly.  It generates a file which uses the same format as the
> OpenLayers.Format.Text ( tab separated values, coordinates and title as
> city name ).
>
>     Now I want to replace the GML format by Text format but don't really
> understand how this must be done.
>
>     I tried this :
>         OpenLayers.loadURL("/bdga/csvCityBuilder.php", '', this, setCities);
>     and the file is created...  but my php file is not a standard
> request.  It doesn't return anything, it only creates a file.
>
>     I could load the generated file with standard javascript function,
> but I was wondering if there is already something in OpenLayers I could
> use, like the following ( which obviously isn't working ).  Maybe I'm
> missing something.
>         oText = new OpenLayers.Format.Text();
>         oFeatures = oText.read(response.responseText);
>
>     Bellow is the GML version of it which works fine.  Any help would be
> appreciated.
>
> // a GetFeature on layer BDGA_HABIT_P_POINT to get all cities and their
> // coordinates.  See setCites function for more info.
> sUrl = sMSURL;
> sUrl += "?map=";
> sUrl += sBDGAMapPath;
> sUrl += "&service=WFS&version=1.0.0&request=GetFeature";
> sUrl += "&TYPENAME=BDGA_HABIT_P_POINT";
> OpenLayers.loadURL(sUrl, '', this, setCities);
>
> // add one option per city to a select html element with value equal to
> // the city coordinates ( longitude, latitude )
> function setCities(response) {
>     oGML =  new OpenLayers.Format.GML();
>     oFeatures = oGML.read(response.responseText);
>
>     var aCities = new Array();
>
>     // put the results in an array first to be able to sort it
>     for (var key in oFeatures){
>         var szValue = "";
>         szValue += oFeatures[key].geometry.x;
>         szValue += ",";
>         szValue += oFeatures[key].geometry.y
>
>         aCities[key] = {
>           cityName: oFeatures[key].attributes['HAP_NM_TOP'],
>           lonlat: szValue
>         };
>     }
>
>     // sort the array by city name
>     aCities.sort(sortByCityName);
>
>     // create on option per city and add it to the select element
>     var oSelect=document.getElementById("zoomToCity");
>     for (i=0; i<aCities.length; i++){
>         var oOption = document.createElement('option');
>         oOption.text=aCities[i]['cityName'];
>         oOption.value=aCities[i]['lonlat'];
>         try
>         {
>             oSelect.add(oOption,null); // standards compliant
>         }
>         catch(ex)
>         {
>             oSelect.add(oOption); // IE only
>         }
>     }
>
>     // The list has finished to be created, so enable it and remove the
> first
>     // option that contained the "please wait" msg
>     oSelect.disabled = "";
>     oSelect.remove(0);
> }
>
> // returns the aCities array sorted by cityName
> function sortByCityName(a, b) {
>     var x = a.cityName.toLowerCase();
>     var y = b.cityName.toLowerCase();
>     return ((x < y) ? -1 : ((x > y) ? 1 : 0));
> }
>
>
> --
> Alexandre Dubé
> Mapgears
> www.mapgears.com
>
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