我已经成功实现了Jquery Validation Plugin http://posabsolute.github.com/jQuery-Validation-Engine/，但我现在正试图让ajax数据库电子邮件检查工作（电子邮件存在/电子邮件可用），我已经写了一些PHP脚本来完成这项工作。它有点工作，但我从IF ELSE声明中得到了最意想不到的奇怪的行为（对我来说似乎真的很疯狂）。观察###标记的评论
PHP代码：查看IFSE声明
/* RECEIVE VALUE */
$validateValue = $_REQUEST['fieldValue'];
$validateId = $_REQUEST['fieldId'];
$validateError = "This username is already taken";
$validateSuccess = "This username is available";
/* RETURN VALUE */
$arrayToJs = array();
$arrayToJs[0] = $validateId;
$req = "SELECT Email
FROM business
WHERE Email = '$validateValue'";
$query = mysql_query($req);
while ($row = mysql_fetch_array($query)) {
$results = array($row['Email']);
}
if (in_array($validateValue, $results)) {
$arrayToJs[1] = false;
echo json_encode($arrayToJs); // RETURN ARRAY WITH ERROR ### popup shows "validating, please wait" then "This username is already taken" when email typed is in database - i.e. Working
file_put_contents('output.txt', print_r("1 in array - Email is Taken " . $validateValue, true)); ### this runs!!
}else{
$arrayToJs[1] = true; // RETURN TRUE
echo json_encode($arrayToJs); // RETURN ARRAY WITH success ### popup shows "validating, please wait" when email typed is NOT in the database - i.e. not Working
file_put_contents('output.txt', print_r("2 else - Email is available " . $validateValue, true));
//### THIS RUNS TOO !!!!!!!!!!!!! i.e. echo json_encode($arrayToJs) wont work for both.. If I change (in_array()) to (!in_array()) i get the reverse when email is in database.
//i.e. only the else statements echo json_encode($arrayToJs) runs and the popup msg shows up green "This username is available" crazy right???
//so basically IF ELSE statements run as expected (confirmed by output.txt) but only one echo json_encode($arrayToJs) will work.!!!!
//If i remove the json_encode($arrayToJs) statements and place it once after the IF ELSE statement i get the same problem.
//both $arrayToJs[1] = false; and $arrayToJs[1] = true; can work separately depending on which is first run IF or ELSE but they will not work in the one after another;
}
这是代码的其余部分 - ＆gt;
1-HTML FORM INPUT CODE：
<tr>
<td> <Label>Business Email</Label>
<br>
<input type="text" name="Email" id="Email" class="validate[required,custom[email],ajax[ajaxUserCallPhp]] text-input">
</td>
</tr>
jquery.validationEngine.js中的2-Relevant JQUERY代码：
$.ajax({
type: type,
url: url,
cache: false,
dataType: dataType,
data: data,
form: form,
methods: methods,
options: options,
beforeSend: function() {
return options.onBeforeAjaxFormValidation(form, options);
},
error: function(data, transport) {
methods._ajaxError(data, transport);
},
success: function(json) {
if ((dataType == "json") && (json !== true)) {
// getting to this case doesn't necessary means that the form is invalid
// the server may return green or closing prompt actions
// this flag helps figuring it out
var errorInForm=false;
for (var i = 0; i < json.length; i++) {
var value = json[i];
var errorFieldId = value[0];
var errorField = $($("#" + errorFieldId)[0]);
// make sure we found the element
if (errorField.length == 1) {
// promptText or selector
var msg = value[2];
// if the field is valid
if (value[1] == true) {
if (msg == "" || !msg){
// if for some reason, status==true and error="", just close the prompt
methods._closePrompt(errorField);
} else {
// the field is valid, but we are displaying a green prompt
if (options.allrules[msg]) {
var txt = options.allrules[msg].alertTextOk;
if (txt)
msg = txt;
}
if (options.showPrompts) methods._showPrompt(errorField, msg, "pass", false, options, true);
}
} else {
// the field is invalid, show the red error prompt
errorInForm|=true;
if (options.allrules[msg]) {
var txt = options.allrules[msg].alertText;
if (txt)
msg = txt;
}
if(options.showPrompts) methods._showPrompt(errorField, msg, "", false, options, true);
}
}
}
options.onAjaxFormComplete(!errorInForm, form, json, options);
} else
options.onAjaxFormComplete(true, form, json, options);
}
});
jquery.validationEngine-en.js中ajaxUserCallPhp的3-Relevent代码：
"ajaxUserCallPhp": {
"url": "validation/php/ajaxValidateFieldUser.php",
// you may want to pass extra data on the ajax call
"extraData": "name=eric",
// if you provide an "alertTextOk", it will show as a green prompt when the field validates
"alertTextOk": "* This username is available",
"alertText": "* This user is already taken",
"alertTextLoad": "*Validating, please wait"
},
我确定问题在于这个回声。
echo json_encode（$ arrayToJs）
请帮助我花费很长时间来完成这项工作并且几乎完全正常工作。
澄清 - 我基本上正在尝试编码它，以便如果我在数据库中键入一个电子邮件它显示红色“此用户名被采用”然后如果我编辑输入框到不在数据库中的电子邮件它变为绿色“用户名是可用的”目前只有一个json_encode将在任何场景中运行，无论我如何更改if else语句 -
非常感谢你。
答案 0 :(得分：0)
好吧，小提琴后终于明白了。我发现当发布任何错误或警告时，json_encode（）返回false。使用xampp / php / logs / error_logs文件中的php错误日志文件我意识到只有在查询结果为null时才会出现错误，导致$ results = null。这导致输出错误，导致json_encode（）无法回显true，这就是为什么我只得到一个响应。
要修复它，我确保在查询数组部分后使用以下代码，$ result数组不为空。
if(empty($results)){
$results [0]= ("obujasdcb8374db");
}
现在整个代码
$req = "SELECT Email
FROM business
WHERE Email = '$validateValue'";
$query = mysql_query($req);
while ($row = mysql_fetch_array($query)) {
$results[] = $row['Email'];
}
if(empty($results)){
$results [0]= ("obujasdcb8374db");
}
if (in_array($validateValue, $results)) {
$arrayToJs[1] = 0;
echo json_encode($arrayToJs); // RETURN ARRAY WITH ERROR
} else {
$arrayToJs[1] = 1; // RETURN TRUE
echo json_encode($arrayToJs); // RETURN ARRAY WITH success
}
答案 1 :(得分：0)
我能够在不修改语言文件的情况下更改ajaxusercallphp，ajaxnamecallphp的ajax url ...你需要在jaquery.validateEngine.js中搜索这一行
查找：_ajax：function（字段，规则，I，选项）
然后向下滚动到ajax请求.ie $ .ajax
将url：rule.url更改为options.ajaxCallPhpUrl
然后你要做的就是将url包含在这样的选项中：
JQuery（“＃formid”）。validateEngine（'attach'，{ajaCallPhpUrl：“yoururl goes here”，onValidationComplete：function（form，status）{ }） 我能够在不修改语言文件的情况下更改ajaxusercallphp，ajaxnamecallphp的ajax url ...你需要在jaquery.validateEngine.js中搜索这一行
查找：_ajax：function（字段，规则，I，选项）
然后向下滚动到ajax请求.ie $ .ajax
将url：rule.url更改为options.ajaxCallPhpUrl
然后你要做的就是将url包含在这样的选项中：
JQuery（“＃formid”）。validateEngine（'attach'，{ajaCallPhpUrl：“yoururl goes here”，onValidationComplete：function（form，status）{ }）