Javascript 在解决内部承诺之前,承诺链将继续
类似的问题,但我不能让它工作无故障 每次我认为我理解承诺,我就证明自己错了 我有这样写的函数Javascript 在解决内部承诺之前,承诺链将继续,javascript,promise,rsvp.js,Javascript,Promise,Rsvp.js,类似的问题,但我不能让它工作无故障 每次我认为我理解承诺,我就证明自己错了 我有这样写的函数 function getFileBinaryData () { var promise = new RSVP.Promise(function(resolve, reject){ var executorBody = { url: rootSite + sourceRelativeUrl + "/_api/web/GetFileByServerRelati
function getFileBinaryData () {
var promise = new RSVP.Promise(function(resolve, reject){
var executorBody = {
url: rootSite + sourceRelativeUrl + "/_api/web/GetFileByServerRelativeUrl('" + fileUrl + "')/$value",
method: "GET",
binaryStringResponseBody: true,
success: function (fileData) {
resolve(fileData.body);
},
error: function (argument) {
alert("could not get file binary body")
}
}
sourceExecutor.executeAsync(executorBody);
});
return promise;
}
function copyFileAction (fileBinaryData) {
var promise = new RSVP.Promise(function(resolve, reject){
var executorBody = {
url: rootSite + targetWebRelativeUrl + "/_api/web/GetFolderByServerRelativeUrl('" + targetList + "')/Files/Add(url='" + fileName + "." + fileExt + "', overwrite=true)",
method: "POST",
headers: {
"Accept": "application/json; odata=verbose"
},
contentType: "application/json;odata=verbose",
binaryStringRequestBody: true,
body: fileBinaryData,
success: function (copyFileData) {
resolve();
},
error: function (sender, args) {
}
}
targetExecutor.executeAsync(executorBody);
});
return promise;
}
$.getScript("/_layouts/15/SP.RequestExecutor.js")
.then(patchRequestExecutor)
.then(function(){
sourceExecutor = new SP.RequestExecutor(sourceFullUrl);
targetExecutor = new SP.RequestExecutor(targetList);
})
.then(getFileInformation)
.then(getFileBinaryData)
.then(copyFileAction)
.then(getTargetListItem)
.then(updateTargetListItem)
.catch(function (sender, args) {
});
$.getScript("/_layouts/15/SP.RequestExecutor.js")
.then(patchRequestExecutor)
.then(function(){
sourceExecutor = new SP.RequestExecutor(sourceFullUrl);
targetExecutor = new SP.RequestExecutor(targetList);
})
.then(function(){
return getFileInformation();
})
.then(function(){
return getFileBinaryData();
})
.then(function(binaryData){
return copyFileAction(binaryData)
})
.then(function(){
return getTargetListItem();
})
.then(function(listItem){
return updateTargetListItem(listItem);
});
我试着像这样锁链
function getFileBinaryData () {
var promise = new RSVP.Promise(function(resolve, reject){
var executorBody = {
url: rootSite + sourceRelativeUrl + "/_api/web/GetFileByServerRelativeUrl('" + fileUrl + "')/$value",
method: "GET",
binaryStringResponseBody: true,
success: function (fileData) {
resolve(fileData.body);
},
error: function (argument) {
alert("could not get file binary body")
}
}
sourceExecutor.executeAsync(executorBody);
});
return promise;
}
function copyFileAction (fileBinaryData) {
var promise = new RSVP.Promise(function(resolve, reject){
var executorBody = {
url: rootSite + targetWebRelativeUrl + "/_api/web/GetFolderByServerRelativeUrl('" + targetList + "')/Files/Add(url='" + fileName + "." + fileExt + "', overwrite=true)",
method: "POST",
headers: {
"Accept": "application/json; odata=verbose"
},
contentType: "application/json;odata=verbose",
binaryStringRequestBody: true,
body: fileBinaryData,
success: function (copyFileData) {
resolve();
},
error: function (sender, args) {
}
}
targetExecutor.executeAsync(executorBody);
});
return promise;
}
$.getScript("/_layouts/15/SP.RequestExecutor.js")
.then(patchRequestExecutor)
.then(function(){
sourceExecutor = new SP.RequestExecutor(sourceFullUrl);
targetExecutor = new SP.RequestExecutor(targetList);
})
.then(getFileInformation)
.then(getFileBinaryData)
.then(copyFileAction)
.then(getTargetListItem)
.then(updateTargetListItem)
.catch(function (sender, args) {
});
$.getScript("/_layouts/15/SP.RequestExecutor.js")
.then(patchRequestExecutor)
.then(function(){
sourceExecutor = new SP.RequestExecutor(sourceFullUrl);
targetExecutor = new SP.RequestExecutor(targetList);
})
.then(function(){
return getFileInformation();
})
.then(function(){
return getFileBinaryData();
})
.then(function(binaryData){
return copyFileAction(binaryData)
})
.then(function(){
return getTargetListItem();
})
.then(function(listItem){
return updateTargetListItem(listItem);
});
还是像这样
function getFileBinaryData () {
var promise = new RSVP.Promise(function(resolve, reject){
var executorBody = {
url: rootSite + sourceRelativeUrl + "/_api/web/GetFileByServerRelativeUrl('" + fileUrl + "')/$value",
method: "GET",
binaryStringResponseBody: true,
success: function (fileData) {
resolve(fileData.body);
},
error: function (argument) {
alert("could not get file binary body")
}
}
sourceExecutor.executeAsync(executorBody);
});
return promise;
}
function copyFileAction (fileBinaryData) {
var promise = new RSVP.Promise(function(resolve, reject){
var executorBody = {
url: rootSite + targetWebRelativeUrl + "/_api/web/GetFolderByServerRelativeUrl('" + targetList + "')/Files/Add(url='" + fileName + "." + fileExt + "', overwrite=true)",
method: "POST",
headers: {
"Accept": "application/json; odata=verbose"
},
contentType: "application/json;odata=verbose",
binaryStringRequestBody: true,
body: fileBinaryData,
success: function (copyFileData) {
resolve();
},
error: function (sender, args) {
}
}
targetExecutor.executeAsync(executorBody);
});
return promise;
}
$.getScript("/_layouts/15/SP.RequestExecutor.js")
.then(patchRequestExecutor)
.then(function(){
sourceExecutor = new SP.RequestExecutor(sourceFullUrl);
targetExecutor = new SP.RequestExecutor(targetList);
})
.then(getFileInformation)
.then(getFileBinaryData)
.then(copyFileAction)
.then(getTargetListItem)
.then(updateTargetListItem)
.catch(function (sender, args) {
});
$.getScript("/_layouts/15/SP.RequestExecutor.js")
.then(patchRequestExecutor)
.then(function(){
sourceExecutor = new SP.RequestExecutor(sourceFullUrl);
targetExecutor = new SP.RequestExecutor(targetList);
})
.then(function(){
return getFileInformation();
})
.then(function(){
return getFileBinaryData();
})
.then(function(binaryData){
return copyFileAction(binaryData)
})
.then(function(){
return getTargetListItem();
})
.then(function(listItem){
return updateTargetListItem(listItem);
});
但问题是,即使我返回新的承诺,在任何内部承诺得到解决之前,执行仍在继续。怎么会?它是否应该等到异步请求成功,并且在
成功
回调中调用resolve()
?您在这里没有做错什么。这是jQuery的错,1
问题是jQuery不兼容(直到V3.0),并且无法从其他实现中采用Promissions/thenable,而不是它自己的实现。因此,当您的回调确实返回RSVP承诺时,jQuery只是将它们视为要实现的值,而不是等待它们。您可以将所有承诺都投给延迟的jQuery,它会工作,但您确实不希望这样。要使标准的
承诺
行为(由RSVP提供)起作用,您需要避免jQuery的bugthen
。这:
你能提供一个小而完整的片段来重现这个问题吗?从这里我看不到您的代码中有任何缺陷,应该可以正常工作。这一定是因为并非所有异步函数都返回承诺。我将尝试修改代码以实现它!不要忘记在错误回调中拒绝。例如,你真的应该彻底地更换
警报
!它更像是一个调试助手,可以查看它可能失败的地方!1) 当前位置本机承诺和RSVPGeebus也发生了这种情况,我从未想过这可能是因为这一点,但它现在确实起作用了!非常感谢!