我正在尝试提交表单。在表单中,我有一个字段调用站点名称。如果用户输入的站点名称已在数据库中,则将显示消息"该名称已在使用中"并给出一些建议。到目前为止,它有效。但我想要的是隐藏提交按钮,直到用户在该字段中输入有效值。
这是我的代码:
形式.php:
<script type="text/javascript">
$(document).ready(function(){
$("#sitename").keyup(function() {
var sitename = $('#sitename').val();
if(sitename=="")
{
$("#disp").html("");
}
else
{
$.ajax({
type: "POST",
url: "check_name.php",
data: "sitename="+ sitename ,
success: function(html){
$("#disp").html(html);
}
});
return false;
}
});
});
</script>
<div class="form-group col-sm-3 col-xs-12">
<button class="btn btn-1 btn-fill" type="submit" id="btn-signup" name="btn-signup">Submit</button>
</div>
check_name.php:
include('dbconnect.php');
if(isset($_POST['sitename']))
{
$sitename=mysql_real_escape_string($_POST['sitename']);
$query=mysql_query("select * from template_users where sitename='$sitename'");
$row=mysql_num_rows($query);
if($row==0)
{
/*echo "<span style='color:white;'>Available</span>";*/
}
else
{
$msg = $sitename.rand ( 1 , 10000 );
$msg1 = $sitename.rand ( 1 , 100 );
echo "<span style='color:antiquewhite;' ><b>Already exist please Use different Site Name such as<br/> $msg<br/>$msg1<br/><b/></span>";
}
}
试试这段代码,
<script type="text/javascript">
$(document).ready(function(){
$("#sitename").keyup(function() {
var sitename = $('#sitename').val();
if(sitename=="")
{
$("#disp").html("");
}
else
{
$.ajax({
type: "POST",
url: "check_name.php",
data: "sitename="+ sitename ,
success: function(html){
if(html != 'success')
{
$("#disp").html(html);
$("#btn-signup").hide();
}
else
{
$("#btn-signup").show();
}
},
});
return false;
}
});
});
</script>
<div class="form-group col-sm-3 col-xs-12">
<button class="btn btn-1 btn-fill" type="submit" id="btn-signup" name="btn-signup" style="display:none;">Submit</button>
</div>
在你的check_name.php
<?php
include('dbconnect.php');
if(isset($_POST['sitename']))
{
$sitename=mysql_real_escape_string($_POST['sitename']);
$query=mysql_query("select * from template_users where sitename='$sitename'");
$row=mysql_num_rows($query);
if($row==0)
{
echo "success";
}
else
{
$msg = $sitename.rand ( 1 , 10000 );
$msg1 = $sitename.rand ( 1 , 100 );
echo "<span style='color:antiquewhite;' ><b>Already exist please Use different Site Name such as<br/> $msg<br/>$msg1<br/><b/></span>";
}
die;
}
?>
您需要跟踪 PHP 脚本的结果。将代码更改为:
.PHP
<?php
include('dbconnect.php');
if(isset($_POST['sitename']))
{
$sitename=mysql_real_escape_string($_POST['sitename']);
$query=mysql_query("select * from template_users where sitename='$sitename'");
$row=mysql_num_rows($query);
if($row==0)
{
echo json_encode([ "status" => 1, "html" => "<span style='color:white;'>Available</span>" ]);
}
else
{
$msg = $sitename.rand ( 1 , 10000 );
$msg1 = $sitename.rand ( 1 , 100 );
echo json_encode([ "status" => 0, "html" => "<span style='color:antiquewhite;' ><b>Already exist please Use different Site Name such as<br/> $msg<br/>$msg1<br/><b/></span>" ]);
}
}
?>
.HTML
<script type="text/javascript">
$(document).ready(function () {
$("#btn-signup").hide();
$("#sitename").keyup(function () {
$("#btn-signup").hide();
var sitename = $('#sitename').val();
if (sitename == "")
{
$("#disp").html("");
}
else
{
$.ajax({
type: "POST",
url: "check_name.php",
data: "sitename=" + sitename,
dataType: "json",
success: function (result) {
if (result.status == 1) {
$("#btn-signup").show();
}
$("#disp").html(result.html);
}
});
return false;
}
});
});
</script>
<div class="form-group col-sm-3 col-xs-12">
<button class="btn btn-1 btn-fill" type="submit" id="btn-signup" name="btn-signup">Submit</button>
</div>
也就是说,在启动时隐藏按钮,如果用户输入某些内容,请隐藏按钮并等待文本被验证。如果有效,请显示它。如果用户更改了文本,则该按钮将再次隐藏。
请注意:
1( mysql_*
函数自版本 5.5 起已弃用,并在版本 7 中删除。这本身就足以表明您需要继续前进并使用更安全和积极支持的东西。
2(mysql_real_escape_string
和mysqli_real_escape_string
不安全,因为它们不可靠地考虑服务器编码。如果你想安全,请使用真正的预准备语句(即在MySQL服务器上准备的预准备语句(。
我建议你使用 json 像这样返回数据:
{
"status": "success",
"html" : "<span style='color:antiquewhite;' ><b>Already exist please Use different Site Name such as<br/> $msg<br/>$msg1<br/><b/></span>"
}
这是JavaScript代码:
$(document).ready(function()
{
/** Hide the button first */
$('button').hide();
$('#sitename').on('input', function()
{
var sitename = $('#sitename').val();
if(sitename == '')
{
$("#disp").html("");
}
else
{
$.ajax(
{
type : "POST",
dataType: "json"
url : "check_name.php",
data : "sitename=" + sitename ,
success : function(data)
{
/** When the data is invalid */
if(data.status === 'error')
{
$('button').hide();
$("#disp").html(data.html);
}
else
{
$('button').show();
/** Hide the html when the data is valid */
$("#disp").html('');
}
},
});
}
})
});
还有你的 php 代码:
<?php
include('dbconnect.php');
header('Content-Type: application/json; charset=utf-8');
if(isset($_POST['sitename']))
{
$sitename = mysql_real_escape_string($_POST['sitename']);
$query = mysql_query("select * from template_users where sitename='$sitename'");
$row = mysql_num_rows($query);
if($row == 0)
{
echo json_encode(['status' => 'success',
'html' => "<span style='color:white;'>Available</span>"]);
}
else
{
$msg = $sitename.rand ( 1 , 10000 );
$msg1 = $sitename.rand ( 1 , 100 );
echo json_encode(['status' => 'error',
'html' => "<span style='color:antiquewhite;' ><b>Already exist please Use different Site Name such as<br/> $msg<br/>$msg1<br/><b/></span>"]);
}
}
?>
$.ajax({
type: "POST",
url: "check_name.php",
data: "sitename="+ sitename ,
success: function(html){
if(html !== "") {
$("#btn-signu").attr("disabled", true);
}
else {
$("#btn-signu").removeAttr("disabled");
}
$("#disp").html(html);
}
});
检查成功回调函数中的 html 参数。
在表单中.php将 Javascript 更改为:
<script type="text/javascript">
$(document).ready(function(){
//get the button by its ID
var $button = $('#btn-signup');
$("#sitename").keyup(function() {
//hide the button always
$button.hide();
var sitename = $('#sitename').val();
if(sitename=="")
{
$("#disp").html("");
}
else
{
$.ajax({
type: "POST",
url: "check_name.php",
data: "sitename="+ sitename ,
success: function(html){
$("#disp").html(html);
if(!html.length){
//show the submit button if no error html
$button.show();
}
}
});
return false;
}
});
});
</script>
按钮应初始隐藏。如果该字段可以预填充,则需要在隐藏按钮之前检查该值是否不为空。
<div class="form-group col-sm-3 col-xs-12">
<button class="btn btn-1 btn-fill" type="submit" id="btn-signup" name="btn-signup" style="display:none">Submit</button>
</div>