返回false后运行的Javascript函数

在我的代码中，当选择框被更改时，会调用一个js函数（ConfirmDelete），询问用户是否确定要更改选择框。如果用户选择no，它将返回false，并且通常会停止执行

我的问题是，在此之后我还定义了另一个AJAX/JS函数，它正在等待选择框被更改，如果是，它会将详细信息发送到php脚本，该脚本会将记录添加到mysql数据库中

我想知道，在用户选择否后，我是否可以停止运行AJAX/JS代码

JS函数

function ConfirmDelete()
{
  var x = confirm("Are you sure?");
  if (x)
  return true;
  else
return false;
}

$( ".dropdown" ).change(function() { 
    var request = new XMLHttpRequest();
var id = this.value;
var content = this.name;
request.open("POST", "samefile.php", true);
request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
request.onreadystatechange = function () {
if(request.readyState == 4 && request.status == 200) {
    var return_data = request.responseText;
    alert (return_data);

}
}

request.send("id="+id+"&content="+content);

window.location.reload();
window.location.reload();       
}

 );

$( ".dropdown" ).change(function() { 
    if(!ConfirmDelete()) return;  // right here, use this to confirm
    var request = new XMLHttpRequest();
var id = this.value;
var content = this.name;
request.open("POST", "samefile.php", true);
request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
request.onreadystatechange = function () {
if(request.readyState == 4 && request.status == 200) {
    var return_data = request.responseText;
    alert (return_data);

}
}

request.send("id="+id+"&content="+content);

window.location.reload();
window.location.reload();       
}

 );

AJAX/JS函数

function ConfirmDelete()
{
  var x = confirm("Are you sure?");
  if (x)
  return true;
  else
return false;
}

$( ".dropdown" ).change(function() { 
    var request = new XMLHttpRequest();
var id = this.value;
var content = this.name;
request.open("POST", "samefile.php", true);
request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
request.onreadystatechange = function () {
if(request.readyState == 4 && request.status == 200) {
    var return_data = request.responseText;
    alert (return_data);

}
}

request.send("id="+id+"&content="+content);

window.location.reload();
window.location.reload();       
}

 );

$( ".dropdown" ).change(function() { 
    if(!ConfirmDelete()) return;  // right here, use this to confirm
    var request = new XMLHttpRequest();
var id = this.value;
var content = this.name;
request.open("POST", "samefile.php", true);
request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
request.onreadystatechange = function () {
if(request.readyState == 4 && request.status == 200) {
    var return_data = request.responseText;
    alert (return_data);

}
}

request.send("id="+id+"&content="+content);

window.location.reload();
window.location.reload();       
}

 );

HTML选择框

<select class="dropdown" name="09:00-1-0-16-05-26" Onchange="return ConfirmDelete();">
<option class="co0es0sp1fd1oo0fs0" value="47">mike berry</option>
<option value="cancel-47">Cancel</option></select>

迈克·贝瑞
取消

html的顺序是

• 头文件中定义的JS函数

• HTML代码

• 之后的AJAX/JS脚本标记

AJAX/JS函数

function ConfirmDelete()
{
  var x = confirm("Are you sure?");
  if (x)
  return true;
  else
return false;
}

$( ".dropdown" ).change(function() { 
    var request = new XMLHttpRequest();
var id = this.value;
var content = this.name;
request.open("POST", "samefile.php", true);
request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
request.onreadystatechange = function () {
if(request.readyState == 4 && request.status == 200) {
    var return_data = request.responseText;
    alert (return_data);

}
}

request.send("id="+id+"&content="+content);

window.location.reload();
window.location.reload();       
}

 );

$( ".dropdown" ).change(function() { 
    if(!ConfirmDelete()) return;  // right here, use this to confirm
    var request = new XMLHttpRequest();
var id = this.value;
var content = this.name;
request.open("POST", "samefile.php", true);
request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
request.onreadystatechange = function () {
if(request.readyState == 4 && request.status == 200) {
    var return_data = request.responseText;
    alert (return_data);

}
}

request.send("id="+id+"&content="+content);

window.location.reload();
window.location.reload();       
}

 );

直接在HTML中添加onchange事件并不能解决问题。

---

用这个代替
在您的示例中，我没有看到确认删除函数和更改事件函数是如何连接的。它们独立运行，除非您将Ajax代码放在确认删除函数的“true”块中。为什么根本没有响应！