On Saturday, June 17, 2017 at 10:12:46 AM UTC-4, Walter Lee Davis wrote: > > > > On Jun 16, 2017, at 11:56 PM, fugee ohu <[email protected] <javascript:>> > wrote: > > > > > > > > On Thursday, June 15, 2017 at 5:03:37 PM UTC-4, Walter Lee Davis wrote: > > > > > On Jun 15, 2017, at 1:00 AM, fugee ohu <[email protected]> wrote: > > > > > > > > > > > > On Wednesday, June 14, 2017 at 8:49:27 PM UTC-4, Walter Lee Davis > wrote: > > > There's nothing dated about it. Using RJS (Remote JavaScript) > rendering gives you the ability to render just the parts of the page you > want to replace. With jQuery, you would still have to render the custom > HTML that you want to inject into the page, but then you would use load() > or replaceWith() to substitute it into the DOM. Now you have two problems. > > > > > > Walter > > > > > > > On Jun 14, 2017, at 7:54 PM, fugee ohu <[email protected]> wrote: > > > > > > > > I wanna render to an element instead of redirecting so went back to > my book Agile Web Development with Rails adding ajax it says to make my > link remote: true and put a respond_to js in my controller and then use a > js.erb file Is that a little dated I've been doing some jquery by including > *.js files in assets/javascripts Can I render my views to the element using > jquery instead of js.erb I notice rails doesn't generate any js.erb files > by default Should I do as the book says or find a way to do it with jquery? > thanks ia > > > > > > > > -- > > > > You received this message because you are subscribed to the Google > Groups "Ruby on Rails: Talk" group. > > > > To unsubscribe from this group and stop receiving emails from it, > send an email to [email protected]. > > > > To post to this group, send email to [email protected]. > > > > To view this discussion on the web visit > https://groups.google.com/d/msgid/rubyonrails-talk/2a6923a4-e128-4b1f-be14-6eed119e66df%40googlegroups.com. > > > > > > For more options, visit https://groups.google.com/d/optout. > > > > > > > > > As I iterate through posts I don't know which post someone's going to > comment but my js.erb file can only render to a class or id name so when i > click comment forms are gonna load for all posts on the page What's the > solution please? > > > > The way I usually do this is I have a partial for a list or table that > renders just one of the items, which I gather up in the controller, then I > use the content_tag_for() helper (removed from Rails 5, but available in a > gem). So my list of items would look like this: > > > > <ul id="items"> > > <%= render @items %> > > </ul> > > > > And to get that little bit to work, you just need to have a partial > here: app/views/items/_item.html.erb with the following contents: > > > > <%= content_tag_for item, :li do %> > > <h1><%= item.title %></h1> > > <%= simple_format item.description %> > > <%- end -%> > > > > In this technique, remember that the local variable (item) inside the > partial is named for whatever the partial is named. If you decide to change > the name of the partial to item_listing, then inside that partial, your > local variable would be item_listing. When you follow the pattern of naming > it for the singular of the collection of items you want to render, and you > name your collection for the plural, then you can use that lovely terse > render @[name of the collection]. But the long form is actually > render(partial: 'item', collection: @items), so when you decide to rename > the collection or the partial, that's the long-form you need to use in > order to clarify what you mean to Rails. > > > > Walter > > > > > > > > -- > > > You received this message because you are subscribed to the Google > Groups "Ruby on Rails: Talk" group. > > > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected]. > > > To post to this group, send email to [email protected]. > > > To view this discussion on the web visit > https://groups.google.com/d/msgid/rubyonrails-talk/84d6c62f-aa8f-429b-b774-29ccacdd3581%40googlegroups.com. > > > > > For more options, visit https://groups.google.com/d/optout. > > > > > > Your example is with a js file in assets Can we do this with a js.erb in > views instead? Same code? What about the file naming convention please > Thanks > > > Actually, it occurred to me after I wrote this that you could do it > without any JavaScript at all. In fact, that's what I usually tell people > to do first, so I'm surprised I led with the JS example. The thing is, you > build the JS version second, as a layer over the HTML version. That way you > have a fallback. > > In the _item.html.erb partial, you would change the template to include > the link helper directly: > > <%= content_tag_for item, :li do %> > <h1><%= item.title %></h1> > <%= simple_format item.description %> > <%= link_to 'Comment', new_comment_path(item_id: item.id) %> > <%- end -%> > > Now that link doesn't have to be "magic'd" into the page with JS at all. > It is there and it works. Try it out, see how it works. Then layer JS on > top of it (if you want to put the comment form into a modal dialog, for > example). > > Also, rather than continuing with your current project, I suggest you > build a "stunt app" just to work out this linking issue. Just cd up a few > levels in your drive, and `rails new stunt-app` and `rails scaffold Item > name description:text` and `rails scaffold Comment item:references > comment:text` That's enough to work with here, and by using scaffold, you > will start with a known-working framework without any assumptions. If > you're using Rails 5, don't forget to add the optional: true bit to your > belongs_to declaration on Comment. Otherwise you will find that you cannot > save an Item without comments. > > Now to the naming conventions. > > If you use the <%= render @items %> trick, then you have to have a file > named views/items/_item.html.erb. Inside that partial, the local variable > item will be loaded by the Rails framework if you have passed a collection > named @items in your render call. All of that is the optimized "magic" way > of doing this. It is a shortcut, and it can be expanded to: > > <%= render partial: 'items/item', collection: @items %> > > If you name the partial something other than the singular of the > collection, then you have to use the long form. If your partial is in a > different object's view hierarchy than the one that is rendering it, then > you also need to put that part in the partial name (how I used items/item > above). > > So the same thing could be rendered as: > > <%= render partial: 'foos/foo', collection: @items %> > > and the partial would be changed to name the instance variable inside it > 'foo'. > > If you really get into the weeds, then you need to have an iterator in the > parent page, and really spell it out for Rails: > > <%- @items.each do |item| -%> > <%= render partial: 'items/item', locals: { item: item } %> > <%- end -%> > > The shortcuts are there to make your production work faster, and if you > follow the conventions, then they just work in a way that may confuse you > at first. I certainly was confused the first time I did this, particularly > when I tried to use a non-conventional setup. It took me a long time for > the penny to drop that the name of the instance variable inside the partial > was NOT based on the name of the object being rendered, but rather the > partial's filename. > > Walter > > What about the js to render the comment form into the div of the right post id?
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