我希望在创建同步ajax时显示等待对话框。 我使用智能向导,在第一步到第一步之间进行更改,我必须验证一些数据才能做到这一点,我必须一个接一个地进行3 ajax调用,而这一切都完成后我想显示一个等待对话框。这就是我正在做的事情。
if (indexes.fromStep==1) {
res=false;
var validatorResult = validator.checkAll($("#install_modbus_form"))
if (validatorResult) {
$("#modal_loader").modal()
$.ajax({
type: "post",
url: url1,
async: false,
dataType: "json",
data:{
data
},
success: function(response)
{
if (response.success)
{
$.ajax({
type: "post",
url: url2,
async: false,
dataType: "json",
data:{
data
},
success: function(response)
{
if (response.success)
{
$.ajax({
type: "post",
url: url3,
async: false,
dataType: "json",
data:{
data
},
success: function(response)
{
if (response.success)
{
//make magic here
res=true;
}
},
failure:function()
{
waitingDialog.hide()
res=false
},
error:function(a,b,c) {
waitingDialog.hide()
res=false
}
)
}
},
failure:function()
{
waitingDialog.hide()
res=false
},
error:function(a,b,c) {
waitingDialog.hide()
res=false
}
)
}
},
failure:function()
{
waitingDialog.hide()
res=false
},
error:function(a,b,c) {
waitingDialog.hide()
res=false
}
)
$("#modal_loader").modal('hide')
return res;//if true change step
}
}
我有使用beforeSend来显示等待对话框,我也试图使用setTimeout但等待对话框没有显示而且智能向导不会前进
希望你能帮忙,我是jquery的新人。
抱歉英文不好
答案 0 :(得分:0)
假设您使用jQuery-Smart-Wizard,解决方案在于:
onLeaveStep
事件处理程序和(或包括)幸运的是,即使插件本身不支持异步,但要实现这一点非常简单。基本上,您需要做的是:
false
回调onLeaveStep
.smartWizard('goForward')
.smartWizard('showError')
。基于smartWizard的ReadMe.md,这是一个执行同步和异步验证的框架:
$(document).ready(function() {
var waitingDialog = $('#whatever'); // ???
// Smart Wizard
$('#wizard').smartWizard({
onLeaveStep: leaveAStepCallback,
onFinish: onFinishCallback
});
function leaveAStepCallback(obj, context) {
alert("Leaving step " + context.fromStep + " to go to step " + context.toStep);
var returnValue;
switch(context.fromStep) {
case 1: // asynchronous
if (validator.checkAll($("#install_modbus_form"))) {
$("#modal_loader").modal();
waitingDialog.show();
validateStep1() // validateStep1() returns a promise
.then(function() {
// You will arrive here only if all three ajax calls were successful and all three responded with a truthy `response.success`.
$('#wizard').smartWizard('goForward'); // advance to next step
}, function(e) {
// You will arrive here on validation failure
$('#wizard').smartWizard('showError', e.message); // something went wrong
}).always(function() {
// You will arrive here on validation success or failure
waitingDialog.hide(); // the waiting is over
$("#modal_loader").modal('hide'); // ???
});
} else {
$('#wizard').smartWizard('showError', 'validator.checkAll() failed');
}
returnValue = false; // *must* return false to remain at step 1. If validation is successful, `.smartWizard('goForward')` will be executed later (see above).
break;
case 2: // synchronous
returnValue = validateStep2(); // validateStep2() returns true of false
break;
case 3:
...
break;
}
return returnValue; // true or false
}
// And here's the all-important `validateStep1()` :
function validateStep1() {
var sequence = [
{ url: 'url/1', data: {...} },
{ url: 'url/2', data: {...} },
{ url: 'url/3', data: {...} }
];
return sequence.reduce(function(promise, item, i) {
return promise.then(function() {
return $.ajax({
'type': 'post',
'url': item.url,
'dataType': 'json',
'data': item.data
}).then(function(response, textStatus, jqXHR) {
return response.success ? response : $.Deferred().reject(jqXHR, 'response.success not truthy at validation stage ' + i); // note: need to mimic jQuery.ajax's error signature.
});
});
}, $.when()) // starter promise for the reduction
.then(null, function(jqXHR, textStatus, errorThrown) {
return $.Deferred().reject(new Error(textStatus || errorThrown));
});
}
function validateStep2() {
// if validation here is synchronous, then return true of false
if(....) {
return true;
} else {
return false;
}
}
function validateStep3() {
...
}
// etc.
function onFinishCallback(objs, context) {
if(validateAllSteps()) {
$('form').submit();
}
}
function validateAllSteps() {
var isStepValid = true;
// all step validation logic
return isStepValid;
}
});
注意:
onLeaveStep
回调。validateStep1()
使用链式承诺模式对三个ajax调用进行排序。validateAllSteps()
需要重复执行step1验证,那么您需要再次调用validateStep1().then(...)
,或者从先前缓存的承诺链接。正如您所看到的,上面的某些方面是不完整的,所以还有一些工作要做。