最近在学php,由于项目的需要！想在php中用ajax来完成一些体验(减少业务处理的单页压力).发现最近也有一位朋友为此苦恼不已.不废话了！
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1.注意几个编码地方
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1.1表单所在的网页的:meta
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<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″ />
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1.2XMLHTTPRequest GET的编码
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httpRequest.setRequestHeader(“Content-Type”, “application/x-www-form-urlencoded; charset=UTF-8″);
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此处设置不对!responseText会返回empty(没有内容),如果您有FireFox并装有FireBug组件的话,点击状态栏的绿色箭头打开控件面板(非OS的,FireBug的),选中Console会看到Response选项是:
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Illegal mix of collations (gbk_chinese_ci,IMPLICIT) and (latin1_swedish_ci,COERCIBLE) for operation ‘=
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当然如果是连接数据库的话也可能跟下面的(1.4)有关系.
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1.3ajax GET请求的页面(.php)header
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header(“Content-Type:text/html;charset=UTF-8″);
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1.4数据连接的编码
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mysql_query(“SET CHARACTER SET UTF8″);
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如果你的数据库是GBK的或其它的字符集,为了统一编码还要与以上三个统一起来.下面我的示例用的数据库也是GBK,从昨天开始我一起把它设成:
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mysql_query(“SET CHARACTER SET GBK”);
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可还是有时发现会返回空(empty 我用的是ResponseText),千万不要写成UTF-8噢,数据库的字符集是没有中间的”-”
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2.如果还是返回空或无效的值
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例如:
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a.html中有表单,a用XMLHTTPRequest和b.php通讯.
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首先要保证b.php可以正确运行,例b.php?param=value打印出来的是你期望的值
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如果a.html打印b.php返回的结果(ajax)与上面的(单独运行b.php)执行结果有出入.可以删除b.php中的空行试试!我想应该不会出现这种情况,但我有几次作demo删除后和删除前确实有出入
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3.下面是朋友发给我的一个示例!我修改完的源码
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表单页:
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3.1JS部分
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function processRequest() {
var tran;
if (httpRequest.readyState == 4 || httpRequest.readyState == “complete”) {
if (httpRequest.status == 200 || httpRequest.statusText == “OK”) {
tran = httpRequest.responseText;
//setGlobalValue(tran);
alert(tran);
} else {
alert(“您所请求的页面发生错误!”);
}
}
}
function sendRequest(strurl) {
httpRequest = false;
if (window.XMLHttpRequest) { // Mozilla, Safari, …
httpRequest = new XMLHttpRequest();
} else if (window.ActiveXObject) { // IE
try {
httpRequest = new ActiveXObject(“Msxml2.XMLHTTP”);
} catch (e) {
try {
httpRequest = new ActiveXObject(“Microsoft.XMLHTTP”);
} catch (e) {}
}
}
if (!httpRequest) {
window.alert(“通讯失败”);
return false;
}
httpRequest.onreadystatechange = processRequest;
httpRequest.open(“GET”, strurl, true);
httpRequest.setRequestHeader(“Content-Type”, “application/x-www-form-urlencoded; charset=UTF-8″);
httpRequest.send(null);
}>}
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function processRequest() {
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var tran;
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if (httpRequest.readyState == 4 || httpRequest.readyState == “complete”) {
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if (httpRequest.status == 200 || httpRequest.statusText == “OK”) {
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tran = httpRequest.responseText;
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//setGlobalValue(tran);
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alert(tran);
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} else {
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alert(“您所请求的页面发生错误!”);
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}
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}
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}
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function sendRequest(strurl) {
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httpRequest = false;
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if (window.XMLHttpRequest) { // Mozilla, Safari, …
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httpRequest = new XMLHttpRequest();
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} else if (window.ActiveXObject) { // IE
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try {
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httpRequest = new ActiveXObject(“Msxml2.XMLHTTP”);
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} catch (e) {
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try {
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httpRequest = new ActiveXObject(“Microsoft.XMLHTTP”);
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} catch (e) {}
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}
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}
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if (!httpRequest) {
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window.alert(“通讯失败”);
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return false;
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}
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httpRequest.onreadystatechange = processRequest;
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httpRequest.open(“GET”, strurl, true);
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httpRequest.setRequestHeader(“Content-Type”, “application/x-www-form-urlencoded; charset=UTF-8″);
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httpRequest.send(null);
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}>}
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function asychronouscheck(strparam){
if(strparam.value.length == 0){
document.getElementById(“state3″).innerHTML=”新帐号不能为空”;
}
var strurl=”checknewaccount.php?name=”+encodeURIComponent(strparam.value);
sendRequest(strurl);
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<BR pre=”">
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function asychronouscheck(strparam){
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if(strparam.value.length == 0){
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document.getElementById(“state3″).innerHTML=”新帐号不能为空”;
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}
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var strurl=”checknewaccount.php?name=”+encodeURIComponent(strparam.value);
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sendRequest(strurl);
表单部分
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<dl>
<dt>新帐号</dt>
<dd><label id=”state3″></label></dd>
<dd><input type=”text” name=”nusername” id=”nusername” size=”26″ maxlength=”14″ onblur=”asychronouscheck(this)” /></dd>
</dl>
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<dl>
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<dt>新帐号</dt>
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<dd><label id=”state3″></label></dd>
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<dd><input type=”text” name=”nusername” id=”nusername” size=”26″ maxlength=”14″ onblur=”asychronouscheck(this)” /></dd>
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</dl>
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php文件
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<?php
header(“Content-Type:text/html;charset=UTF-8″);
conn=mysql_connect(‘localhost’,\'root’,\'bus’);
mysql_select_db(‘test’,conn);
mysql_query(“SET CHARACTER SET UTF8″);
curName=GET[\'name\'];
if(emptyempty(curName)){
echo “新帐号不能为空”;
exit();
}
tSQL=”SELECT uid FROM members WHERE username =’curName’”;
try{
result=mysql_query(tSQL) OR die(mysql_error());
row = mysql_num_rows(result);
flush();
if(row>0){
echo “false”;
}else{
echo “true”;
}
mysql_free_result(result);
mysql_close(conn);
}catch(Exception e){
print e->getMessage();
}
?>
来源：http://blog.csdn.net/xiaofanku