Check password

http://stackoverflow.com/questions/26322867/how-to-validate-password-using-following-conditions

by chepe263

HTML

<label for="password">Type password</label><br/>
<input type="text" name="password" id="password" />
<input type="button" name="check" id="check" onclick="check()" value="Check password!"/>

<p id="respuesta"></p>

JavaScript

checkbt = document.getElementById("check");
passtxt = document.getElementById("password");
respuesta = document.getElementById("respuesta");

check = function(){
	texto = passtxt.value.trim();
    uppercase = false;
    lowercase = false;
    number = false;
	lenght = false;
    //uppercase letter    
    for (i=0; i< texto.length; i++){
        if (texto[i] == texto[i].toUpperCase()){
            uppercase = true;
            break;
        } else {
            uppercase = false;
        }
    }
//lowercase
        for (i=0; i< texto.length; i++){
            if (texto[i] == texto[i].toLowerCase()){
                lowercase = true;
                break;
            } else {
                lowercase = false;
            }
        }

    //number
        for (i=0; i< texto.length; i++){
            if (!isNaN(texto[i])){
                number = true;
                break;
            } else {
                number = false;
            }
        }    

    
    if (texto.length < 6){
        lenght = false;
    } else {
		lenght = true;
	}
    
    if (lowercase && uppercase && number && lenght){
        respuesta.innerHTML = "Password is good";    
    } else {
        respuesta.innerHTML = "Password is bad <br />" +
		"lowercase: " + boolstr(lowercase) + "<br />"+
		"uppercase: " + boolstr(uppercase) + "<br />"+
		"number: " + boolstr(number) + "<br />"+
		"lenght: " + boolstr(lenght) + "<br />";
    }
    
}

function boolstr(val){
if (val == true)
	return "true";
	else
	return "false";
}