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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)
+```