我在提交时调用一个函数来检查是否已完成所需的上传，如果数据库中没有上传，则不应提交表单。
通过使用alert，我可以看到我的checkuploads.asp正在返回正确的值，它显示的是没有找到数据的警报，但它没有阻止表单提交。
$(window).load(function() {
$('#Save').click(function() {
$.ajax({
type: "POST",
url: "checkuploads.asp?value=" + $('#RequestNo').val(),
success: function(data) {
if (data === "Not Found") {
alert("the data was not found");
data.preventDefault();
window.history.back();
return false;
} else
if (data === "Found") {
alert("the data was found");
alert(data);
}
}
});
});
});
提前致谢。
因为您正在使用ajax请求，所以在表单提交之前，响应将需要一段时间。所以，你需要在ajax调用之后使用return false;。
$(window).load(function() {
$('#Save').click(function() {
$.ajax({
type: "POST",
url: "checkuploads.asp?value=" + $('#RequestNo').val(),
success: function(data) {
if (data === "Not Found") {
alert("the data was not found");
//data.preventDefault();//Remove this un-necessary line
window.history.back();
//return false;//Remove this too. It is un-necessary
} else
if (data === "Found") {
alert("the data was found");
alert(data);
//Replace the form id with correct one
("#myForm").submit();//Add this line
}
}
});
return false;
});
});
这是完整的例子：
<!DOCTYPE html>
<html>
<head>
<title>Test</title>
<meta charset="UTF-8">
<script src="jquery-3.2.1.min.js" type="text/javascript"></script>
</head>
<body>
<div>
<form id="myForm" action="/my-listener">
<input type="text" name="RequestNo" id="RequestNo" />
<input type="button" id="Save" value="Save" />
</form>
</div>
<script>
$(document).ready(function() {
$('#Save').click(function() {
$.ajax({
type: "POST",
url: "checkuploads.asp?value=" + $('#RequestNo').val(),
success: function(data) {
if (data === "Not Found") {
alert("the data was not found");
window.history.back();
} else if (data === "Found") {
alert("the data was found");
alert(data);
$("#myForm").submit();
}
}
});
return false;
});
});
</script>
</body>
</html>
试试这个：
$(window).load(function() {
$('#Save').click(function(e) {
e.preventDefault();
$.ajax({
type: "POST",
url: "checkuploads.asp?value=" + $('#RequestNo').val(),
success: function(data) {
if (data === "Not Found") {
alert("the data was not found");
data.preventDefault();
window.history.back();
return false;
} else
if (data === "Found") {
alert("the data was found");
window.location.replace( "checkuploads.asp?value=" + $('#RequestNo').val()); // you can chanbge url as per your need
// in case of form use
$('#form').submit();
alert(data);
}
}
});
return false;
});
});