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    <p>Building on <a href="https://stackoverflow.com/a/15480307/1430996">Vitaliy's CSS</a> and <a href="https://stackoverflow.com/a/16664260/1430996">Mehmet's jQuery</a>, I changed the <code>a</code> tags to <code>span</code> tags and incorporated some <a href="http://getbootstrap.com/2.3.2/base-css.html#icons" rel="noreferrer">Glyphicons</a> and <a href="http://getbootstrap.com/2.3.2/components.html#labels-badges" rel="noreferrer">badging</a> into <a href="http://jsfiddle.net/jhfrench/GpdgF/" rel="noreferrer">my take on a Bootstrap tree widget</a>.</p> <p><strong>Example:</strong> <img src="https://i.stack.imgur.com/qnp0a.png" alt="my take on a Bootstrap tree widget"></p> <p>For extra credit, I've created a <img src="https://i.stack.imgur.com/wG64V.png" alt="Github icon"><a href="https://github.com/jhfrench/bootstrap-tree" rel="noreferrer">GitHub project to host the jQuery and LESS code that goes into adding this tree component</a> to Bootstrap. Please see the project documentation at <a href="http://jhfrench.github.io/bootstrap-tree/docs/example.html" rel="noreferrer">http://jhfrench.github.io/bootstrap-tree/docs/example.html</a>.</p> <p>Alternately, here is the LESS source to generate that CSS (the JS can be picked up from the <a href="http://jsfiddle.net/jhfrench/GpdgF/" rel="noreferrer">jsFiddle</a>):</p> <pre><code>@import "../../../external/bootstrap/less/bootstrap.less"; /* substitute your path to the bootstrap.less file */ @import "../../../external/bootstrap/less/responsive.less"; /* optional; substitute your path to the responsive.less file */ /* collapsable tree */ .tree { .border-radius(@baseBorderRadius); .box-shadow(inset 0 1px 1px rgba(0,0,0,.05)); background-color: lighten(@grayLighter, 5%); border: 1px solid @grayLight; margin-bottom: 10px; max-height: 300px; min-height: 20px; overflow-y: auto; padding: 19px; a { display: block; overflow: hidden; text-overflow: ellipsis; width: 90%; } li { list-style-type: none; margin: 0px 0; padding: 4px 0px 0px 2px; position: relative; &amp;::before, &amp;::after { content: ''; left: -20px; position: absolute; right: auto; } &amp;::before { border-left: 1px solid @grayLight; bottom: 50px; height: 100%; top: 0; width: 1px; } &amp;::after { border-top: 1px solid @grayLight; height: 20px; top: 13px; width: 23px; } span { -moz-border-radius: 5px; -webkit-border-radius: 5px; border: 1px solid @grayLight; border-radius: 5px; display: inline-block; line-height: 14px; padding: 2px 4px; text-decoration: none; } &amp;.parent_li &gt; span { cursor: pointer; /*Time for some hover effects*/ &amp;:hover, &amp;:hover+ul li span { background: @grayLighter; border: 1px solid @gray; color: #000; } } /*Remove connectors after last child*/ &amp;:last-child::before { height: 30px; } } /*Remove connectors before root*/ &gt; ul &gt; li::before, &gt; ul &gt; li::after { border: 0; } } </code></pre>
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    1. COwell done. Except, of course, the odd behaviour of li children of `.parent_li` who lose their background color and become gray when their parent is hovered over (in your second tree).
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    2. COThanks @Harsh. The hover behavior you think odd follows Vitaliy's programming to give the user a visual indicator of which nodes will be collapsed.
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    3. COWhat is the license of this code? I'd like to use it in my project!
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