//** Form field Limiter v2.0- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com
//** Feb 25th, 09'- Script creation date
//** This notice must stay intact for legal use

var fieldlimiter={

defaultoutput: "<b>[int]</b> characters remaining in your input limit.", //default message that gets output to statusid element

uncheckedkeycodes: /(8)|(13)|(16)|(17)|(18)/, //keycodes that are not checked, even when limit has been reached. See http://www.javascriptkit.com/jsref/eventkeyboardmouse.shtml for avail keycodes

limitinput:function(e, config){
    var e=window.event || e
    var thefield=config.thefield
    var keyunicode=e.charCode || e.keyCode
    if (!this.uncheckedkeycodes.test(keyunicode)){
        if (thefield.value.length>=config.maxlength){
            if (e.preventDefault)
                e.preventDefault()
            return false
        }
    }
},

showlimit:function(config){
    var thefield=config.thefield
    var statusids=config.statusids
    var charsleft=config.maxlength-thefield.value.length
    if (charsleft<0) //if user has exceeded input limit (possible if cut and paste text into field)
        thefield.value=thefield.value.substring(0, config.maxlength) //trim input
    for (var i=0; i<statusids.length; i++){
        var statusdiv=document.getElementById(statusids[i])
        if (statusdiv) //if status DIV defined
            statusdiv.innerHTML=this.defaultoutput.replace("[int]", Math.max(0, charsleft))
    }
    config.onkeypress.call(thefield, config.maxlength, thefield.value.length)
},

cleanup:function(config){
    for (var prop in config){
        config[prop]=null
    }
},


addEvent:function(targetarr, functionref, tasktype){
    if (targetarr.length>0){
        var target=targetarr.shift()
        if (target.addEventListener)
            target.addEventListener(tasktype, functionref, false)
        else if (target.attachEvent)
            target.attachEvent('on'+tasktype, function(){return functionref.call(target, window.event)})
        this.addEvent(targetarr, functionref, tasktype)
    }
},

setup:function(config){
    if (config.thefield){ //if form field exists
        config.onkeypress=config.onkeypress || function(){}
        config.thefield.value=config.thefield.value
        this.showlimit(config)
        this.addEvent([window], function(e){fieldlimiter.showlimit(config)}, "load")
        this.addEvent([window], function(e){fieldlimiter.cleanup(config)}, "unload")
        this.addEvent([config.thefield], function(e){return fieldlimiter.limitinput(e, config)}, "keypress")
        this.addEvent([config.thefield], function(){fieldlimiter.showlimit(config)}, "keyup")
    }
}

}