jquery与ajax
1.与后台数据异步交互：
<script language="javascript">
function createQueryString(){
var firstName = encodeURI($("#firstName").val());
var birthday = encodeURI($("#birthday").val());
//组合成对象的形式
var queryString = {firstName:firstName,birthday:birthday};
return queryString;
}
function doRequestUsingGET(){
$.get("14-5.aspx",createQueryString(),
//发送GET请求
function(data){
$("#serverResponse").html(decodeURI(data));
}
);
}
function doRequestUsingPOST(){
$.post("14-5.aspx",createQueryString(),
//发送POST请求
function(data){
$("#serverResponse").html(decodeURI(data));
}
);
}
</script>
</head>
<body>
<h2>输入姓名和生日</h2>
<form>
<input type="text" id="firstName" /><br>
<input type="text" id="birthday" />
</form>
<form>
<input type="button" value="GET" onclick="doRequestUsingGET();" /><br>
<input type="button" value="POST" onclick="doRequestUsingPOST();" />
</form>
<div id="serverResponse"></div>
</body>
2.控制ajax
<script language="javascript">
function createQueryString(){
//必须两次编码才能解决中文问题
var firstName = encodeURI(encodeURI($("#firstName").val()));
var birthday = encodeURI(encodeURI($("#birthday").val()));
//组合成对象的形式
var queryString = "firstName="+firstName+"&birthday="+birthday;
return queryString;
}
function doRequestUsingGET(){
$.ajax({
type: "GET",
url: "14-5.aspx",
data: createQueryString(),
success: function(data){
$("#serverResponse").html(decodeURI(data));
}
});
}
function doRequestUsingPOST(){
$.ajax({
type: "POST",
url: "14-5.aspx",
data: createQueryString(),
success: function(data){
$("#serverResponse").html(decodeURI(data));
}
});
}
</script>
</head>
<body>
<h2>输入姓名和生日</h2>
<form>
<input type="text" id="firstName" /><br>
<input type="text" id="birthday" />
</form>
<form>
<input type="button" value="GET" onclick="doRequestUsingGET();" /><br>
<input type="button" value="POST" onclick="doRequestUsingPOST();" />
</form>
<div id="serverResponse"></div>
</body>
3.设置全局ajax:
<script language="javascript">
$.ajaxSetup({
//全局设定
url: "14-5.aspx",
success: function(data){
$("#serverResponse").html(decodeURI(data));
}
});
function createQueryString(){
//必须两次编码才能解决中文问题
var firstName = encodeURI(encodeURI($("#firstName").val()));
var birthday = encodeURI(encodeURI($("#birthday").val()));
//组合成对象的形式
var queryString = "firstName="+firstName+"&birthday="+birthday;
return queryString;
}
function doRequestUsingGET(){
$.ajax({
data: createQueryString(),
type: "GET"
});
}
function doRequestUsingPOST(){
$.ajax({
data: createQueryString(),
type: "POST"
});
}
</script>
</head>
<body>
<h2>输入姓名和生日</h2>
<form>
<input type="text" id="firstName" /><br>
<input type="text" id="birthday" />
</form>
<form>
<input type="button" value="GET" onclick="doRequestUsingGET();" /><br>
<input type="button" value="POST" onclick="doRequestUsingPOST();" />
</form>
<div id="serverResponse"></div>
</body>
ajax提示信息：
<script language="javascript">
var oInputField; //考虑到很多函数中都要使用
var oPopDiv; //因此采用全局变量的形式
var oColorsUl;
function initVars(){
//初始化变量
oInputField = $("#colors");
oPopDiv = $("#popup");
oColorsUl = $("#colors_ul");
}
function clearColors(){
//清除提示内容
oColorsUl.empty();
oPopDiv.removeClass("show");
}
function setColors(the_colors){
//显示提示框，传入的参数即为匹配出来的结果组成的数组
clearColors(); //每输入一个字母就先清除原先的提示，再继续
oPopDiv.addClass("show");
for(var i=0;i<the_colors.length;i++)
//将匹配的提示结果逐一显示给用户
oColorsUl.append($("<li>"+the_colors[i]+"</li>"));
oColorsUl.find("li").click(function(){
oInputField.val($(this).text());
clearColors();
}).hover(
function(){$(this).addClass("mouseOver");},
function(){$(this).removeClass("mouseOver");}
);
}
function findColors(){
initVars(); //初始化变量
if(oInputField.val().length > 0){
//获取异步数据
$.get("14-10.aspx",{sColor:oInputField.val()},
function(data){
var aResult = new Array();
if(data.length > 0){
aResult = data.split(",");
setColors(aResult); //显示服务器结果
}
else
clearColors();
});
}
else
clearColors(); //无输入时清除提示框（例如用户按del键）
}
</script>
</head>
<body>
<form method="post" name="myForm1">
Color: <input type="text" name="colors" id="colors" onkeyup="findColors();" />
</form>
<div id="popup">
<ul id="colors_ul"></ul>
</div>
</body>