content-tag | 易学教程

Ruby on Rails 4 does not display content_tag :i

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问题 Why are all the content_tags display except the content_tag :i def sign_full_tag(group, obj, name, input_type="text", size="12", popover=true) content_tag :div, class: "row" do content_tag :div, class: "col-md-" + size do content_tag :div, class: "form-group left-inner-addon" + class_for_invalid_input(obj, name) do content_tag(:i, "", class: "fa fa-user fa-fw text-muted") # NOT DISPLAY!!! group.text_field( name, class: "form-control" + (popover ? " popover-add" : ""), id: name.to_s.gsub("_",

Polymer: How to watch for change in <content> properties

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问题 I'm just starting to learn Polymer. Here is a generic version of my polymer element: <polymer-element name="my-element"> <template> <style> :host { position:absolute; width: 200px; height: 100px; background-color: green; } </style> <p>my element</p> <content id="first-in"></content> <content id="second-in"></content> </template> <script> Polymer('my-element', { domReady: function() { alert(this.children[0].getAttribute('title')); //this returns the value I want to observe } }); </script>

How to render nested ul list for ancestry tree view

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问题 I want to render a structure shown below using content_tag where the collection is the ancestry object. <ul> <li> <a>Fruits</a> <ul> <li> <a>Apple</a> </li> <li> <a>Orange</a> </li> </ul> </li> <li> <a>Colours</a> </li> </ul> 回答1: I believe it's the answer, community, please, edit and tweak this post if it's wrong. Create a helper method like this def nested_groups(groups) content_tag(:ul) do groups.map do |group, sub_groups| content_tag(:li, group.name + nested_groups(sub_groups)) end.join

Polymer: How to watch for change in <content> properties

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I'm just starting to learn Polymer. Here is a generic version of my polymer element: <polymer-element name="my-element"> <template> <style> :host { position:absolute; width: 200px; height: 100px; background-color: green; } </style> <p>my element</p> <content id="first-in"></content> <content id="second-in"></content> </template> <script> Polymer('my-element', { domReady: function() { alert(this.children[0].getAttribute('title')); //this returns the value I want to observe } }); </script> <polymer-element> The content tags are both being filled with another custom element (again slightly