我正在编程的脚本有问题。我是AJAX的新手，无法弄清楚我做错了什么让它无法工作。任何帮助将受到高度赞赏。我在页面上有多个表单，当我分离表单时，Ajax和php之间的通信工作正常。但当我把所有东西放在一起时，它就会停止工作。我确实相信它可能是一个通信问题，也可能是一些冲突的脚本或只是一些不好的编码。
这是php代码：
@session_start();
if(isset($_SESSION["username"])){
header("location: home.php");
exit();
}else{
$usertitle = $_POST['ut'];
$userfname = $_POST['uf'];
$userlname = $_POST['ul'];
$useremail = $_POST['ue'];
$userloc = $_POST['uloc'];
$user_est_typ = $_POST['utp'];
$userfname = preg_replace("/[^A-Za-z0-9?![:space:]]/","",$userfname);
$userlname = preg_replace("/[^A-Za-z0-9?![:space:]]/","",$userlname);
if($usertitle == "Title...."){
echo '<font color="red">Error: Please select a title.';
exit();
}else if($userfname == NULL){
exit('<font color="red">Error: You need a first name to proceed. </font>');
}else if( strlen($userfname) <= 2){
exit('<font color="red">Error: First name should be three (3) or more letters.</font>');
} else if($userlname == ""){
exit('<font color="red">Error: Giving a Surname would be nice.</font>');
}else if( strlen($userlname) <= 2){
exit('<font color="red">Error: Surname should be three (3) or more Letters.</font>');
}else if(!strpos($useremail, "@") || !strpos($useremail, "." || !filter_var($useremail, FILTER_VALIDATE_EMAIL) === true)){
exit('<font color="red">Email Address not valid</font>');
}else if($user_est_typ == "Select..."){
exit('<font color="red">Error: You must select an estimate type to proceed.</font>');
}else if($userloc == ""){
exit('<font color="red">Error: A location would be required so as to get the radiation data for the estimates</font>');
}else {
include("../../scripts/dbconect.php");
$queryuseremail = mysql_query("SELECT id FROM userdata WHERE userEmail='$useremail' LIMIT 1");
$useremail_check = mysql_num_rows($queryuseremail);
if ($useremail_check > 0){
echo "The email address ".$useremail." is already registered in ur database";
exit();
}
// More Validation and mysql insert
exit('<font color="red">signup_success</font>');
}
}
这是我的AJAX代码：
function _(x){
return document.getElementById(x);
}
function show(id){
var divelement = _(id);
if(divelement.style.display == 'none')
divelement.style.display = 'block';
else
divelement.style.display == 'none';
}
function hide(id){
var divelement = _(id);
if(divelement.style.display == 'block')
divelement.style.display = 'none';
else
divelement.style.display == 'block';
}
function emptyElement(id){
_(id).innerHTML = "";
}
function estimatetypeimg(){
var estType = _('estimatetype').value;
if (estType == 'solarpv'){
show('estimate_pv');
hide('estimate_thermal');
}
else if(estType == 'solarthermal'){
hide('estimate_pv');
show('estimate_thermal');
}
else{
hide('estimate_pv');
hide('estimate_thermal');
}
}
function newUsers() {
var title = _("salutation").value;
var fname = _("fname").value;
var lname = _("lname").value;
var email = _("email").value;
var loc = _("location").value;
var tp = _("estimatetype").value;
var url = "ajax.php";
var vars = "ut="+title+"uf="+fname+"&ul="+lname+"&ue="+email+"&uloc="+loc+"&utp="+tp;
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (xhttp.readyState == 4 && xhttp.status == 200) {
_("statuscheck").innerHTML = xhttp.responseText;
}
};
xhttp.open("POST", url, true);
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttp.send(vars);
}
这是我的HTML代码：
<div id="startbuts" style="display:none">
<form class="pure-form" name="startbutsform" id="startbutsform" onsubmit="return false;">
<button type="submit" id="newusersbtn" onclick="show('newusers'); hide('existingusers'); hide('existingusersbtn');"class="pure-button pure-button-primary">New Estimate</button>
<button type="submit" id="existingusersbtn" onclick="show('existingusers'); hide('newusers'); hide('newusersbtn');" class="button-secondary pure-button">Load Previous Estimate</button>
</form>
<div id="existingusers" style="display:none">
<form class="pure-form" name="signupex" id="signupex" onsubmit="return false;">
<fieldset>
<legend>Existing users: login with your email and Data ID.</legend>
<input type="email" id="dataemail" placeholder="Email" >
<input type="text" id="dataid" placeholder="DataId"><br/>
<button id="signupexbtn" type="submit" onclick="signinold()" class="pure-button pure-button-primary">Sign in</button>
</fieldset>
</form>
</div>
<div id="newusers" style="display:none">
<form class="pure-form" name="signupnew" id="signupnew" onsubmit="return false;">
<fieldset>
<legend>New users start here.</legend>
<div class="pure-control-group">
<label for="salutation">Title: </label>
<select id="salutation" name="salutation">
<option>Title....</option>
<option>Prof. Dr.</option>
<option>Prof.</option>
<option>Dr.</option>
<option>Mr.</option>
<option>Mrs.</option>
<option>Miss.</option>
</select>
</div>
<div class="pure-control-group">
<label for="fname">First name:</label>
<input id="fname" name="fname" type="text" placeholder="First Name">
</div>
<div class="pure-control-group">
<label for="lname">Last name:</label>
<input id="lname" name="lname" onfocus="emptyElement('errorcheck')" type="text" placeholder="Last Name">
</div>
<div class="pure-control-group">
<label for="email">Email Address:</label>
<input id="email" name="email" type="email" onfocus="emptyElement('errorcheck')" placeholder="Email Address">
</div>
<div class="pure-control-group">
<label for="location">Project Location: </label>
<input id="location" name="location" type="text" onfocus="emptyElement('errorcheck')" placeholder="Enter City ex Buea...">
</div>
<div class="pure-control-group">
<label for="estimatetype">Type of Estimate: </label>
<select id="estimatetype" name="estimatetype" onchange="estimatetypeimg()">
<option value="Select">Select...</option>
<option value="solarpv">Solar PV</option>
<option value="solarthermal">Solar Thermal</option>
</select>
</div>
<div id="estimate_pv" style="display:none" >
<img id="solarpvimg" src="images/solarpv.png" width="250" height="109" alt="Solar PV" />
</div>
<div id="estimate_thermal" style="display:none">
<img id="solarthermalimg" src="images/solarthermal.png" width="250" height="109" alt="Solar PV" />
</div>
<hr/>
<button id="signupnewbtn" type="button" class="pure-button pure-button-primary" onclick="newUsers()" >Start Calculator</button>
<button onclick="emptyElement('errorcheck'); hide('estimate_pv'); hide(estimate_thermal);" class="pure-button pure-button-primary" type="reset">Reset </button>
</fieldset>
</form>
</div>
</div>
答案 0 :(得分：0)
谢谢David Lavieri，尤其是Sher Kahn。你的回答让我思考，我终于找到了为什么我没有从我的PhP脚本得到任何回应。正如汗也提到的，我只是一个爱好编码器，你绝对正确我的代码不是很干净。我清理了JSLint上的代码并意识到我有太多糟糕的编码习惯。 :)。还要感谢您使用malsup查询插件。它们非常方便，并且会有很多帮助。
最后我遇到的问题。实际问题是php文件的链接。网址定义不明确，这使得ajax和php文件之间的通信无法进行。我使用Dreamweaver，当我使用浏览工具时，它给了我一个文件的链接，但由于我的javascript是外部的，链接只是相对于Javascript文件，而不是主html文件。此外，当我仔细检查我的数据变量时，我错过了“＆amp;”对于我在“uf”之前的字符串中的第二个变量
var url = "ajax.php";// i changed the path file to scripts/ajax.php and it worked like magic.
var vars = "ut="+title+"uf="+fname+"&ul="+lname+"&ue="+email+"&uloc="+loc+"&utp="+tp;// before
var vars = "ut="+title+"&uf="+fname+"&ul="+lname+"&ue="+email+"&uloc="+loc+"&utp="+tp;// After
希望这对其他人有帮助。
尊敬并感谢大卫和汗。