[英]AJAX call and getting return data in Node
我想從客戶端到后端進行ajax調用。 我從成功函數中獲得了成功的調用,但是,我不明白如何從服務器獲取數據以從客戶端返回。
目前我嘗試使用res.send的錯誤是:
Error: Can't set headers after they are sent.
function getProfessorResults() {
var textData = $('#inputsm').val();
var data = {user:"gopal@gmail.com"};
$.ajax({
url: 'http://localhost:3000',
data: { theme: "somevalue", snippet: { name: "somename", content: "somevalue" } },
method: 'POST',
async: false,
cache: false,
timeout: 5000,
contentType: "application/json",
success: function(data) {
console.log("success");
},
complete: function(data) {
console.log("completed");
},
error: function(jqXHR, textStatus, errorThrown) {
alert('Error connecting to the Node.js server... ' + textStatus + " " + errorThrown);
}
});
}
exports.home = function(req, res) {
function passList(profArray, callback) {
setTimeout(function () {
callback(profArray);
}, 1000);
}
function getProfs(teacher_name, successCallback) {
google.resultsPerPage = 10
var nextCounter = 0
google(teacher_name, function (err, res){
if (err) console.error(err)
var teacher_results = []; //Hold all the teachers returned from the function
for (var i = 0; i < res.links.length; ++i) {
var link = res.links[i];
if (!link.title.includes('Add') || !link.title.includes('RATINGS') || !link.title.includes("Hint")) {
teacher_results.push(link.title);
}//End if for comparisons ||
} //End For
successCallback(teacher_results);
}); //End google function
teacher_results = ['tester1', 'tester2'];
successCallback(teacher_results);
} //End searchForProfessor
getProfs(teacher_name, function(data) {
prof_list = data;
console.log(prof_list);
return true;
});
if (req.method == 'POST'){
console.log("true");
// dataReceived = JSON.parse(req);
// console.log(dataReceived);
var obj = {
tid: 'ryan'
};
res.send(JSON.stringify(obj));
}
res.render('home', {
profs: prof_list,
dataStuff : dataReceived
});
};
在后端,您應該有一條到達AJAX呼叫的路由。 在這里,您可以調用send
響應。
在node.js / express中,這看起來像
app.get('/ajaxURL', function (req, res) {
res.send('I want this string to return to the client');
});
要從前端訪問數據,請在AJAX回調中訪問它:
$.ajax({url: '/ajaxURL'}).done(function (data) {
console.log(data);
});
我沒有正確地了解上下文,但是您可以通過此示例弄清楚。
從服務器response.send("Your data");
發送數據response.send("Your data");
通過AJAX的成功方法在客戶端中訪問此數據: success:function(data){console.log(data)};
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