Getting Sum of Variables in JS

[npm]

Hi,
I have javascripts that display the number of radio stations from my xml files. I'm in need of a javascript that can add all the variables and then display the grand total. I looked on W3Schools's JS Math section and I couldn't find a section on addition.

Here's my individual scripts that display each state's # of stations:

<script type="text/javascript">
    xmlDoc=loadXMLDoc("stationsAK.xml");
    x1=xmlDoc.getElementsByTagName('city');
    document.write("Total Stations: " + x1.length);
</script><br />
<script type="text/javascript">
    xmlDoc=loadXMLDoc("stationsAL.xml");
    x2=xmlDoc.getElementsByTagName('city');
    document.write("Total Stations: " + x2.length);
</script><br />
 

etc...all the way to:

<script type="text/javascript">
    xmlDoc=loadXMLDoc("stationsWY.xml");
    x50=xmlDoc.getElementsByTagName('city');
    document.write("Total Stations: " + x50.length);
</script>
 

I just need a script that can take the "length" of all the variables (x1 through x50) and return the total # of stations from all 50 states.

I'm assuming it's something like this:

<script type="text/javascript">
  document.write(Math.sum(x1,x2,....,x50))
</script>
 

Thanks in advance!

[gits]

hi ...

that will not work ... but you may use a simple function that does the trick for your purpose, define the following FIRST:

<script type="text/javascript">
var total_stations = 0;
 
function add_stations(val) {
    total_stations += val;
}
</script>
 

and everytime you use document.write you call the func to add the station-no:

<script type="text/javascript">
    xmlDoc =loadXMLDoc("stationsWY.xml");
 
    var x50 = xmlDoc.getElementsByTagName('city');
    var stations = x50.length;
 
    document.write("Total Stations: " + stations);
 
    add_stations(stations);
</script>
 

now the global var total_stations has the sum of all stations assigned and you may alert or write it ... or whatever you want to do with it ;)

kind regards

[npm]

Hi,
Sorry it took so long to get back on your reply, this project/experiment had to be put on the back burner for a while.

But it worked great! Thanks!

[gits]

glad to hear that ;) ... post back to the forum anytime you have more questions ...

kind regards