title: expand and collapse View functionality in Angularjs
body: <pre><code>Category 1 (Level 1)
  - Subcategory 1 (Level 2)
  ----Sub-Subcategory 2 (Level 3)
  -----Sub-subcategory 3 (Level 3)
  Category 2 (Level 1)
  - Subcategory 2 (Level 2)
  - Subcategory 3 (Level 2)
  -----Sub-subcategory 4 (Level 3)
  ------Subcategory 5 (Level 3)
  </code></pre>
  
  <p>For Example 1:</p>
  
  <pre><code>Tangible Assets (Level 1)
  -.Vehicles      (Level 2)
  ----Staff Vehicles (Level 3)
  ----Cars 
  - Computers &amp; Electronics (Level 2)
  -----Cash Counting Machine (Level 3)
  ----Computer &amp; Electronics (Level 3)
  ----Computer Software      (Level 3)
  </code></pre>
  
  <p>Show Record Level 1 click the Level 1 display Level 2 then click the Level 2 display Level 3</p>