源代码：
脚本一：
<!DOCTYPE html> <html> <head> <title>Auto-fill Form Fields</title> <link rel="stylesheet"href="script06.css" rel="external nofollow" > <script src="script06.js"></script> </head> <body> <form action="#"> Please enter your state:<br> <input type="text" id="searchField" autocomplete="off"><br> <div id="popups"> </div> </form> </body> </html>
脚本二：
body, #searchfield {
font: 1.2em arial, helvetica,sans-serif;
}
.suggestions {
background-color: #FFF;
padding: 2px 6px;
border: 1px solid #000;
}
.suggestions:hover {
background-color: #69F;
}
#popups {
position: absolute;
}
#searchField.error {
background-color: #FFC;
}
脚本三：
window.onload = initAll;
var xhr = false;
var statesArray = new Array();
function initAll() {
document.getElementById("searchField").onkeyup = searchSuggest;
if (window.XMLHttpRequest) {
xhr = new XMLHttpRequest();
}
else {
if (window.ActiveXObject) {
try {
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e) { }
}
}
if (xhr) {
xhr.onreadystatechange = setStatesArray;
xhr.open("GET", "us-states.xml",true);
xhr.send(null);
}
else {
alert("Sorry, but I couldn't create an XMLHttpRequest");
}
}
function setStatesArray() {
if (xhr.readyState == 4) {
if (xhr.status == 200) {
if (xhr.responseXML) {
var allStates = xhr.responseXML.getElementsByTagName("item");
for (var i=0; i<allStates.length; i++) {
statesArray[i] = allStates[i].getElementsByTagName("label")[0].firstChild;
}
}
}
else {
alert("There was a problem with the request " + xhr.status);
}
}
}
function searchSuggest() {
var str = document.getElementById("searchField").value;
document.getElementById("searchField").className = "";
if (str != "") {
document.getElementById("popups").innerHTML = "";
for (var i=0; i<statesArray.length;i++) {
var thisState = statesArray[i].nodeValue;
if (thisState.toLowerCase().indexOf(str.toLowerCase())== 0) {
var tempDiv = document.createElement("div");
tempDiv.innerHTML = thisState;
tempDiv.onclick = makeChoice;
tempDiv.className = "suggestions";
document.getElementById("popups").appendChild(tempDiv);
}
}
var foundCt = document.getElementById("popups").childNodes.length;
if (foundCt == 0) {
document.getElementById("searchField").className ="error";
}
if (foundCt == 1) {
document.getElementById("searchField").value = document.getElementById("popups").
firstChild.innerHTML;
document.getElementById("popups").innerHTML = "";
}
}
}
function makeChoice(evt) {
if (evt) {
var thisDiv = evt.target;
}
else {
var thisDiv = window.event.srcElement;
}
document.getElementById("searchField").value = thisDiv.innerHTML;
document.getElementById("popups").innerHTML = "";
}
分析如下：
1. Please enter your state:<br>
<input type="text"id="searchField" autocomplete="off"><br>
<div id="popups"> </div>
