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    <pre><code>var comparator = function(a, b) { var aName = a.get('name'), bName = b.get('name'), aParentId = a.get('parentId'), bParentId = b.get('parentId'); if(!aParentId || !bParentId || aParentId == bParentId) { // In these 3 cases, name has precedence if(aName &lt; bName) { return -1; } else if(aName &gt; bName) { return 1; } else { return 0; } } else if(aParentId &lt; bParentId) { return -1; } else /* aParentId &gt; bParentId */ { return 1; } }; </code></pre> <p>EDIT: Corrected. The two sorting levels have to be taken into account, keeping in mind that any missing parentId amounts to equal parentIds.</p> <p>You could also implement it as a list of fields / tailored comparators that execute one after the others, where the next comparator is delegated to when the current finds an equality.</p> <pre><code>var loopedComparator = function(a, b) { var fields = [ { name: 'parentId', comparator: function(a, b) { return (!a || !b || a == b) ? 0 : (a &lt; b) ? -1 : 1; } }, { name: 'name', comparator: function(a, b) { return (a == b) ? 0 : (a &lt; b) ? -1 : 1; } } ]; var i, result = 0; for(i in fields) { var field = fields[i]; result = field.comparator(a.get(field.name), b.get(field.name)); if(result !== 0) { return result; // On inequality we return right away } // Else we continue, delegating the comparison to the next field / comparator } // When the loop is done, or if fields was defined empty, we return the last equality return result; }; </code></pre> <p>Of course with this scheme you can add as many columns as you like and define custom comparators for each of them.</p>
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    1. POJavaScript backbone collection sort on multiple fields
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    1. COYes this comparator sorts on name, but I want to sort on parent id too,(multiple columns). Please see my edited question that would clear the question.
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    2. COI'm sorry, I misunderstood your question.
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    3. CO@Akshay Corrected. I tried to elaborate on the prev answer. Hope it helps you.
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