Adding conditions (if-else) to RJS template

Rails
1

I tried following Ryan B.’ railscast on rjs tips
(#45 RJS Tips - RailsCasts) and apply his method of
using if-else inside the rjs template, but can’t seem to get it to work.
Basically, I’m trying to toggle the text on a link when it’s clicked
(test.js.rjs):

page << “if ($(‘test_link’).value == ‘one’ {”
page.replace_html ‘test_link’, ‘two’
page << “} else {”
page.replace_html ‘test_link’, ‘one’
page << “}”

I believe I have the necessary view and controller code:

<%= link_to_remote ‘one’, :url => { :action => ‘test’ } %>

and

def test
respond_to do |format|
format.js
end
end

2

On 19 Jan 2009, at 09:27, Shilo A. wrote:

page << “} else {”
page.replace_html ‘test_link’, ‘one’
page << “}”

Syntax error - does not compute.

Look closely and see how you forgot the “)” after “‘one’”. Javascript
is very punctuation sensitive, you need to pay special attention to
it. Also, use Firefox for testing and install Firebug to debug your
javascript. It would have indicated this error.

Best regards

Peter De Berdt

3

Syntax error - does not compute.

Look closely and see how you forgot the “)” after “‘one’”. Javascript
is very punctuation sensitive, you need to pay special attention to
it. Also, use Firefox for testing and install Firebug to debug your
javascript. It would have indicated this error.

Thanks Peter. I changed my code to include the closing parenthesis, but
it seems to not work still. I am using firefox w/ firebug, although I’m
still not that seasoned in debugging js - I’ll read up on that. Here’s
what I have now:

page << “if ($(‘test_link’).value == ‘one’) {”
page.alert(‘hello!’)
page << “}”

4

On 19 Jan 2009, at 09:37, Shilo A. wrote:

but
it seems to not work still. I am using firefox w/ firebug, although
I’m
still not that seasoned in debugging js - I’ll read up on that. Here’s
what I have now:

Do links even have a value attribute? It doesn’t seem to contain the
links text if that’s what you were expecting.

Fred

5

On 19 Jan 2009, at 10:37, Shilo A. wrote:

Thanks Peter. I changed my code to include the closing parenthesis,
but
it seems to not work still. I am using firefox w/ firebug, although
I’m
still not that seasoned in debugging js - I’ll read up on that. Here’s
what I have now:

page << “if ($(‘test_link’).value == ‘one’) {”
page.alert(‘hello!’)
page << “}”

Then add before your first “page <<” statement:

page << “console.log($(‘test_link’));”
page << “console.log($(‘test_link’).value);”

There must be something wrong with the value you are trying to access
then.

Best regards

Peter De Berdt

6

Do links even have a value attribute? It doesn’t seem to contain the
links text if that’s what you were expecting.

Fred

Fred - I tried using $(‘test_link’).innerHtml == ‘one’, but the result
is the same.

Peter - Using firebug, I tried typing in the console the following:

console.log($(‘test_link’).value)
undefined

console.log($(‘test_link’).innerHtml)
undefined

I tried just using a simple span hello to see if
console.log works, and I get the same ‘undefined’ message, even though
it’s showing in the page markup.

I don’t want to make this an issue and take up anymore of your time – I
guess I need to improve on my javascript.

Thanks for all your help!

7

On 19 Jan 2009, at 12:10, Shilo A. wrote:

Do links even have a value attribute? It doesn’t seem to contain the
links text if that’s what you were expecting.

Fred

Fred - I tried using $(‘test_link’).innerHtml == ‘one’, but the result
is the same.

That should be: innerHTML

Fred