I am learning Rails 3 and need some help on Ajax part. I am trying to accomplish the following: There is a textarea on the page which has a length of letters constraint, say 100. Every time a symbol is typed there,a nearby label tells you how many letters you have left. I plan to use Ajax to do this. I googled for a few hours and could not figure out how to do this. So far what I have done is the follows: Step 1. Add :remote => true to the form_for method. This form_for method lives in a partial which is called in app/views/foos/home.html.erb Step 2. Add respond_to do |format| format.html format.js end to FoosController''s corresponding Home action. Step 3.create home.js.erb under app/views/foos/ But I do not know how to add something so when a letter is typed in a textarea inside the form generated by form_for method that home.js.erb will process. Could someone help me out here? -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
On 17 December 2011 20:06, Jay Chaun <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> I am learning Rails 3 and need some help on Ajax part. > > I am trying to accomplish the following: > There is a textarea on the page which has a length of letters > constraint, say 100. Every time a symbol is typed there,a nearby label > tells you how many letters you have left. > > I plan to use Ajax to do this.If you do that then every time a letter is typed it will have to send a request to the server, which is a bad idea. Use javascript instead. Colin -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Javascript should be a better idea here. I am new to Rails and do not know how to write javascript inside rails 3. More specifically, two questions: 1. which event should I respond to? keypress, keydown,keyup? 2. Rails 3 uses Unobtrusive Javascript. All I can think of now is old obtrusive one. How can I use unobtrusive one to do this. Any help with pointing to the right direction would be greatly appreciated. Colin Law wrote in post #1037179:> On 17 December 2011 20:06, Jay Chaun <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote: >> I am learning Rails 3 and need some help on Ajax part. >> >> I am trying to accomplish the following: >> There is a textarea on the page which has a length of letters >> constraint, say 100. Every time a symbol is typed there,a nearby label >> tells you how many letters you have left. >> >> I plan to use Ajax to do this. > > If you do that then every time a letter is typed it will have to send > a request to the server, which is a bad idea. Use javascript instead. > > Colin-- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
On Dec 17, 12:06 pm, Jay Chaun <li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> I am learning Rails 3 and need some help on Ajax part. > > I am trying to accomplish the following: > There is a textarea on the page which has a length of letters > constraint, say 100. Every time a symbol is typed there,a nearby label > tells you how many letters you have left. > > I plan to use Ajax to do this. > > I googled for a few hours and could not figure out how to do this. > > So far what I have done is the follows: >I think there are jquery / prototype - plugins available; did you check? Stephan -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Jay Chaun wrote in post #1037174:> I am learning Rails 3 and need some help on Ajax part. > > I am trying to accomplish the following: > There is a textarea on the page which has a length of letters > constraint, say 100. Every time a symbol is typed there,a nearby label > tells you how many letters you have left. > > I plan to use Ajax to do this. > > I googled for a few hours and could not figure out how to do this. > > So far what I have done is the follows: > > Step 1. Add :remote => true to the form_for method. This form_for method > lives in a partial which is called in app/views/foos/home.html.erb > > Step 2. Add > respond_to do |format| > format.html > format.js > end > > to FoosController''s corresponding Home action. > > Step 3.create home.js.erb under app/views/foos/ > > But I do not know how to add something so when a letter is typed in a > textarea inside the form generated by form_for method that home.js.erb > will process. > > Could someone help me out here?hi Jay here is a link to a type of your example i noticed at a website that allows users to post classified ads with a word length of 25 characters and adjusts the character count as you type your advert text description. the site is a free classified ads paper http://www.startrader.com.au/ -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
> Jay Chaun wrote in post #1037174:/views/foos/>> >> But I do not know how to add something so when a letter is typed in a >> textarea inside the form generated by form_for method that home.js.erb >> will process. >> >> Could someone help me out here?Check out JQuery for this. I don''t have any specific examples, but you need to have javascript react to onclick. I think if you use the form_for submit tag, you''ll need to submit the form to get the results you want. However, I believe you only want to query for characters during typing and do something different when you submit the form. -- Greg Akins http://twitter.com/akinsgre -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
try this link, is this what you are looking for? http://cssglobe.com/lab/charcount/01.html You will find complete implementation details and link to download here http://cssglobe.com/post/7161/jquery-plugin-simplest-twitterlike-dynamic-character-count-for-textareas Gautam Pai On Wed, Dec 21, 2011 at 8:16 PM, Greg Akins <angrygreg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> > Jay Chaun wrote in post #1037174: > /views/foos/ > >> > >> But I do not know how to add something so when a letter is typed in a > >> textarea inside the form generated by form_for method that home.js.erb > >> will process. > >> > >> Could someone help me out here? > > Check out JQuery for this. I don''t have any specific examples, but > you need to have javascript react to onclick. I think if you use the > form_for submit tag, you''ll need to submit the form to get the results > you want. > > However, I believe you only want to query for characters during typing > and do something different when you submit the form. > > -- > Greg Akins > http://twitter.com/akinsgre > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > To unsubscribe from this group, send email to > rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en. > >-- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Thanks to Colin Law, Timothy G., Stephan Wehner, Greg Akins, Gautam Pai.
Here is what I got.
1. Ajax is a bad idea for this. It will waste bandwidth and more
importantly makes the character counting unreliable. You do not know
when the response will be.
2. Javascript is supposed to be the tool to handle this type of tasks.
Both jquery and prototype does the work. I did not know which event to
respond to and how to attach event handlers to the element. Now I know.
a) Default place for the javascript code. "application.js". No other
changes is needed. However, if you would like to load code like this
dynamically into your application.js, you are welcome to do so.
b). For jquery, the code could be the following:
===================================================================$(document).ready(function
() {
$(''#id_of_text_area'').keyup(function(){
var s = 100 - $(this).val().length;
$(''#id_of_message'').text("You have " + s +
" characters left");
});
});
===================================================================
The key thing which frustrated me was the $(document).ready. That makes
sure the code is executed at the time when the page is ready, thus
establishing keyup event handler for .keyup event of the element of
concern, i.e. the one whose input needs to be counted. The same is true
for any event handler if it needs to be established by the time the page
is ready.
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