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A way to lazy load partials in Rails 4
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class Controller | |
include LazyLoad | |
def show | |
@model = Model.find(...) | |
respond_to do |format| | |
format.html do | |
@html_specific_data = Model.find(...) | |
end | |
render_lazy_load(format) do | |
@lazy_specific_data = Model.find(...) | |
end | |
end | |
end | |
end |
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module Helper | |
def lazy_render(name) | |
content_tag :div, :id => "lazy-loaded-#{name.gsub('/', '-')}" do | |
content_tag :div, :class => "spinner" do | |
content_tag(:script) do | |
"if(!window.lazyLoads) { window.lazyLoads = []; }; window.lazyLoads.push('#{name}');".html_safe | |
end | |
end | |
end | |
end | |
end |
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module PartialLazyLoad | |
def render_lazy_load(format, &block) | |
format.js do | |
block.call if block | |
if !params[:search] | |
render json: { lazy_load_partial: params[:lazy_load_partial], body: render_to_string(:partial => params[:lazy_load_partial]) } if params[:lazy_load_partial] | |
end | |
end | |
end | |
end |
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<!-- LazyLoad for partials --> | |
<!-- https://gist.github.com/AlexandrBasan/1c7569ef6f37db4819c2cbe9a2fcc378 --> | |
<script> | |
var i, lazyLoad, len, ref, url, host; | |
if (window.lazyLoads) { | |
ref = window.lazyLoads; | |
for (i = 0, len = ref.length; i < len; i++) { | |
lazyLoad = ref[i]; | |
host = location.protocol + '//' + location.host + location.pathname; // window.location.href.split('#')[0] | |
url = host + ("?format=js&lazy_load_partial=" + lazyLoad); | |
$.ajax({ | |
url: url, | |
dataType: "json", | |
success: function(data) { | |
var element = $("#lazy-loaded-" + data.lazy_load_partial.replace(/\//g, '-')); | |
element.removeAttr('align'); | |
return element.html(data.body); | |
}, | |
error: function(JSONHttpRequest, textStatus, errorThrown) { | |
console.log("Status: " + textStatus + ". Error: " + errorThrown); | |
return $("#lazy-loaded-" + lazyLoad.replace(/\//g, '-')).html('<i class="fa fa-ban fa-2x"></i>'); | |
} | |
}); | |
} | |
window.lazyLoads = []; | |
} | |
</script> | |
<!-- LazyLoad for partials --> |
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= render 'foobar' | |
becomes | |
= lazy_render 'foobar' |
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