ruby and javascript

[anja]

Hi,

I am working on a little ruby on rails project. I want to call a ruby
method out of the java_script code. The method takes two parameters,
which I have as javascript variables. How can I pass this javascript
variables to the ruby method?

Here is the source code of the rhtml file:

function updateMap(countryCode, city) {
if (GBrowserIsCompatible()) {
var map = new GMap2(document.getElementById("map"));
<% if GeoCoding.hasGeo(countryCode, city) then -%>
map.panTo(<%= GeoCoding.geo(countryCode, city) %>);
<% end -%>
}
}

I get the error :

undefined local variable or method `countryCode' for
#<#<Class:0xb761c578>:0xb761c4c4>

I understand why I get this error. But I have no idea how I can fix it.

Thanks,
anja

 

[Robert Klemme]

Hi,

I am working on a little ruby on rails project. I want to call a ruby
method out of the java_script code. The method takes two parameters,
which I have as javascript variables. How can I pass this javascript
variables to the ruby method?

Here is the source code of the rhtml file:

function updateMap(countryCode, city) {
if (GBrowserIsCompatible()) {
var map = new GMap2(document.getElementById("map"));
<% if GeoCoding.hasGeo(countryCode, city) then -%>
map.panTo(<%= GeoCoding.geo(countryCode, city) %>);
<% end -%>
}
}

I get the error :

undefined local variable or method `countryCode' for
#<#<Class:0xb761c578>:0xb761c4c4>

I understand why I get this error. But I have no idea how I can fix it.

Thanks,
anja

You can't call Ruby from JavaScript. JS is client side (i.e. executed
in the browser) while Ruby is server side. The Ruby code is executed
long before the client code; the browser sees only the generated
HTML/JS. If you want to do this check you need to fire off a HTTP
request to your server, have him do the work and process the result in JS.

Kind regards

robert