当达到输入长度时表单自动切换焦点_javascript技巧

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(function () {
function tabForward(e) {
e = e || window.event;
var target = e.target || e.srcElement;

if (target.value.length === target.maxLength) {
var form = target.form;

for (var i = 0, len = form.elements.length; i if (form.elements[i] === target) {
if (form.elements[i++]) {
form.elements[i++].focus();
}
break;
}
}
}
}

var textbox1 = document.getElementById("txt1");
var textbox2 = document.getElementById("txt2");
var textbox3 = document.getElementById("txt3");

textbox1.addEventListener("keyup", tabForward, false);
textbox2.addEventListener("keyup", tabForward, false);
textbox3.addEventListener("keyup", tabForward, false);

})();