Getting js variable value or form field value in js.rjs file

rubyonrails-talk
1

Hi all

I have a file "index.js.rjs" where i only want to run the code in it (which updates the contents of a div in typical ajax style) if a variable i have from params is the same as a value of one of the form fields on the page (which has the id 'search_timestamp'). I can't work out, though, how to get that value in my js.rjs file. Something like this

if @timestamp.to_s == page['search_timestamp'].val()   #my code end

I feel like this should be easy but can't figure it out. Can anyone show me how? I've tried just using page.call with some jquery but again can't work out how to get the resultant value back into my ruby code. I'm using jquery and jrails in my app in case that's relevant.

thanks, max

2

Hi all

I have a file "index.js.rjs" where i only want to run the code in it (which updates the contents of a div in typical ajax style) if a variable i have from params is the same as a value of one of the form fields on the page (which has the id 'search_timestamp'). I can't work out, though, how to get that value in my js.rjs file. Something like this

if @timestamp.to_s == page['search_timestamp'].val() #my code end

I feel like this should be easy but can't figure it out. Can anyone show me how? I've tried just using page.call with some jquery but again can't work out how to get the resultant value back into my ruby code. I'm using jquery and jrails in my app in case that's relevant.

At the point that your rjs file is run you can't get the value of anything on user's page, because it's running on your server, not the user's browser. I wrote a little about this a while ago at http://www.spacevatican.org/2008/5/26/conditional-rjs-explained

Fred

3

Frederick Cheung wrote:

� #my code end

I feel like this should be easy but can't figure it out. �Can anyone show me how? �I've tried just using page.call with some jquery but again can't work out how to get the resultant value back into my ruby code. I'm using jquery and jrails in my app in case that's relevant.

At the point that your rjs file is run you can't get the value of anything on user's page, because it's running on your server, not the user's browser. I wrote a little about this a while ago at Conditional RJS explained - Space Vatican

Fred

Hi Fred - thanks, i should have known that. Looking at your great blog post, i adapted this approach:

  page << "if($('some_div').visible()){"   page['some_div'].replace :partial => 'some_partial'   page << '}else{'   page.insert_html :after, 'something_else', :partial => 'header'   page << '}'

like so:

  page << "if($('#search_timestamp').val() == #{params[:timestamp]}){"     page.replace_html "questions", :partial => "questions/questions"     page.replace "flashes", :partial => "common/flashes"   page << "}"

and that's worked a treat. Obviously it means i'm still generating the html from the partials every time, whether use it or not, but i think that's the best that can be done here.

thanks agaain, max