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Rendering a Partial View You can render the partial view in the parent view using the HTML helper methods: @html. Partial() , @html. RenderPartial() , and @html. RenderAction() .
A partial allows you to separate layout code out into a file which will be reused throughout the layout and/or multiple other layouts. For example, you might have a login form that you want to display on 10 different pages on your site.
Rendering is the ultimate goal of your Ruby on Rails application. You render a view, usually . html. erb files, which contain a mix of HMTL & Ruby code. A view is what the user sees.
By default, if you use the :text option, the text is rendered without using the current layout. If you want Rails to put the text into the current layout, you need to add the layout: true option.
render & render partial:
render 'some_view' is a shorthand for render partial: 'some_view'.render file: 'view' will look for a file view.html.erb and NOT _view.html.erb (.erb or any other renderer you use)render will not accept additional local variables for the partial, you need to use render partial: as following for that:
render partial: 'some/path/to/my/partial', locals: { custom_var: 'Hello' }
(http://guides.rubyonrails.org/layouts_and_rendering.html#passing-local-variables)
yield & content_for
yield is typically used in layouts. It tells Rails to put the content for this block at that place in the layout.yield :something associated with content_for :something, you can pass a block of code (view) to display where the yield :something is placed (see example below).A small example about yield:
In your layout:
<html>
<head>
<%= yield :html_head %>
</head>
<body>
<div id="sidebar">
<%= yield :sidebar %>
</div>
</body>
In one of your view:
<% content_for :sidebar do %>
This content will show up in the sidebar section
<% end %>
<% content_for :html_head do %>
<script type="text/javascript">
console.log("Hello World!");
</script>
<% end %>
This will produce the following HTML:
<html>
<head>
<script type="text/javascript">
console.log("Hello World!");
</script>
</head>
<body>
<div id="sidebar">
This content will show up in the sidebar section
</div>
</body>
Posts that might help:
Links to documentation & guides:
render :template and render :partial are two files in rails..
render :template are mostly created according to an action with syntax demo.html.erb
render :partial are reuseable and called from different views , are shared among many pages in application and syntax is _demo.html.erb
yield and render..
Yield is a way to call a block of code with its output but render will include a partial page template where it is called. In rails yield is mostly used in layout whereas render is used in actions or their templates
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