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----
-title: "Arrow key navigation for text fields"
-date: 2008-10-12T17:41:00Z
-comments: false
-url: /post/54266325/arrow-key-navigation-for-text-fields
-tags:
----
-
-
-
-Here is a class for enabling the use of arrow keys to navigate through a grid of input fields: (using mootools)
-
-<!--more-->
-
-
-```javascript
-var FocusMover = new Class({
-
-        initialize: function(sel, col_num){
-
-                this.sel = sel
-                this.col_num = col_num
-                this.inputs = $$(this.sel)
-                this.current_focus = 0
-
-                var self = this
-
-                this.inputs.each(function(item, index){
-                        item.addEvent('keydown',function(key){
-                                $try(function(){
-                                        self[key.key]()
-                                })
-                        })
-                        item.addEvent('focus',function(e){
-                                self.refresh(e)
-                        })
-
-                        item.set('myid', index)
-                })
-
-                this.inputs[0].focus()
-
-        },
-
-
-        refresh: function(e){
-                this.current_focus = e.target.get('myid')
-        },
-
-        down: function(){
-                i = parseInt(this.current_focus) + parseInt(this.col_num)
-                this.inputs[i].focus()
-        },
-
-        up: function(){
-                i = parseInt(this.current_focus) - parseInt(this.col_num)
-                this.inputs[i].focus()
-        },
-
-        left: function(){
-                i = parseInt(this.current_focus) - 1
-                this.inputs[i].focus()
-        },
-
-        right: function(){
-                i = parseInt(this.current_focus) + 1
-                this.inputs[i].focus()
-        }
-
-})
-```
-
-As you can see, the constructor takes two arguments: a selector (which should return a list of all your input fields), and the number of input field columns. So for a 4x2 table, you would set it up like this:
-
-```javascript
-var FM = new FocusMover('#mytable input', 4)
-```