Javascript call in Controller

rubyonrails-talk
1

Hello guys,

I would like to know if i can call a javascript function directly from my controller and get the return of the function.

for example:

And than i would like in my controller to do something like this: #controller render :text => call “test();”

There is a way to do something like this?

Thanks

Fernando

2

Hello guys,

I would like to know if i can call a javascript function directly from my controller and get the return of the function.

No, the controller is written in Ruby and runs on the server. Javascript runs in the browser. Why do you want to write the function in javascript, why not just use Ruby?

Colin

3

Hello,

Because i need to get the content of a div in the page.

I need to do this

var currentEvents = jQuery(“.wc-cal-event”); currentEvents.each(function(index, element) { var calEvent = jQuery(this).data(“calEvent”); alert(calEvent.start); alert(calEvent.end); });

So i need to call a function to return to me this calEvent values, to use in a search.

There is a way to do this with ruby instead of javascript?

Thanks

Fernando

4

Hello,

Please don't top post, it makes it difficult to follow the thread. Insert your reply at appropriate points in previous post. Thanks.

Because i need to get the content of a div in the page.

Think about when the controller and view code is run. The controller/view code is completely run *before* it is sent to the browser. Therefore you cannot access anything in a div in the controller, because the div does not exist until it is sent to the browser. If you know what is *going* to be in the div then you can use that in the controller. Once the view has been built it is sent to the browser and then you can only run javascript.

Colin

5

To clarify, Are you trying to get these values before THIS page is set? and if so what is creating these values? Would you not already have the data?

If you are trying to get values via javascript for the next request could you not use javascript on the page to set params on what sets the search?

im a little confused on your flow. please clarify a bit more and I may be able to assist.

6

I want to get this value AFTER the page is set. The user creates some divs using ajax ( its a calendar ), and than when he click in the search button, i want to get the values that the user choiced in this div`s and use then in my controller to make the search.

But as you said: "If you are trying to get values via javascript for the next request

could you not use javascript on the page to set params on what sets

the search?"

How can i do this? How can i send params for my controller with javascript?

Thanks

7

Fernando Leandro wrote in post #975487:

How can i do this? How can i send params for my controller with javascript?

The same way you always send params to your controllers. Either put them in the query string (for GET requests) or put them in the request body as form data (for POST or PUT requests).

Then access them from the params hash in the controller (params[:some_value]).

8

Robert,

Can you give me an example of how to do this

“The same way you always send params to your controllers. Either put them in the query string (for GET requests) or put them in the request body as form data (for POST or PUT requests).”

I dont know how to do this manually, usually i just always send with a rails helper.

Thanks,

Fernando

9

Robert,

Can you give me an example of how to do this

"The same way you always send params to your controllers. Either put them in the query string (for GET requests) or put them in the request body as form data (for POST or PUT requests)."

I dont know how to do this manually, usually i just always send with a rails helper.

Are you using Prototype or jQuery? In Prototype, you get the content of form elements using

var data = $F('theIdOfTheFormElement');

If you're not putting the user's data in a form field (even a hidden one) then you will need to do something hacky like

var data = $('theIdOfTheElement').innerHTML.stripTags();

Then to send it to your controller, you do something like this:

new Ajax.Request('/url/of/endpoint',{parameters:{your_rails_parameter: data}});

To do the same, but update a portion of the page with whatever HTML your Rails request returns, you substitute Updater for Request, and add the ID of the element you need to update:

new Ajax.Updater('theIdOfTheElementYouWantToUpdate', '/url/of/endpoint', {parameters:{your_rails_parameter: data}});

Note that Updater does not replace the outer box, only the contents of the box you indicate with your ID. Also, Updater does not update form fields (you can replace them, but the correct thing to do is to use Ajax.Request and a callback function onSuccess to update anything besides a DIV or another container element.

Walter

10

Hello guys,

I would like to know if i can call a javascript function directly from my controller and get the return of the function.

for example:

And than i would like in my controller to do something like this: #controller render :text => call “test();”

What are you trying to achieve? Is it that you have a js library and don’t want to port it to ruby? There is no ‘native’ way to do this but may be possible, just as certain test libraries can call js functions, but first to clear is whether you really need to do this.