JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.cdnjs.com/ajax/libs/underscore.js/1.1.4/underscore-min.js"></script>
<script src="http://ajax.cdnjs.com/ajax/libs/backbone.js/0.3.3/backbone-min.js"></script>
<div id="search_container">a</div>
<script type="text/template" id="search_template">
    <label>Search</label>
    <input type='number' id="search_input" />
</script>

JavaScript

SearchView = Backbone.View.extend({
        initialize: function(){
            this.render();
        },
        render: function(){
            var template = _.template( $("#search_template").html(), {} );
            this.el.html( template );
        },
        events: {
            "keyup #search_input":"typeOfField"
        },
       typeOfField:function(event){
           var valuem=document.getElementById("search_input").value;
            alert(valuem); 
       }
    });
    
    var search_view = new SearchView({ el: $("#search_container") });