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---
layout: post
title: "Arrow key navigation for text fields"
date: 2008-10-12T17:41:00Z
comments: false
permalink: /post/54266325/arrow-key-navigation-for-text-fields
categories:
---
Here is a class for enabling the use of arrow keys to navigate through a grid of input fields: (using mootools)
```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)
```
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