Javascript 如何在node.js web服务中包含另一个参数？
抱歉，如果这是一个乏味的问题，我只是刚刚开始了解JS/node.JS如何处理post/get消息 我正在编写一个web服务，根据用户的纬度/经度和距离从mongodb数据库查询数据。我在前端代码中编写了以下函数：Javascript 如何在node.js web服务中包含另一个参数？,javascript,node.js,mongodb,Javascript,Node.js,Mongodb,抱歉，如果这是一个乏味的问题，我只是刚刚开始了解JS/node.JS如何处理post/get消息 我正在编写一个web服务，根据用户的纬度/经度和距离从mongodb数据库查询数据。我在前端代码中编写了以下函数： // Take query parameters and incorporate into a JSON queryBody $scope.queryUsersFromLast24Hours = function(){ // Assemble Query Bo
// Take query parameters and incorporate into a JSON queryBody
$scope.queryUsersFromLast24Hours = function(){
// Assemble Query Body
queryBody = {
longitude: parseFloat($scope.formData.longitude),
latitude: parseFloat($scope.formData.latitude),
distance: parseFloat($scope.formData.distance)
};
// Post the queryBody to the /query POST route to retrieve the filtered results
$http.post('/queryUsersFromLast24Hours', queryBody)
// Store the filtered results in queryResults
.success(function(queryResults){
console.log(JSON.stringify(queryBody));
// Pass the filtered results to the Google Map Service and refresh the map
gservice.refresh(queryBody.latitude, queryBody.longitude, queryResults);
// Count the number of records retrieved for the panel-footer
$scope.queryCount = queryResults.length;
})
.error(function(queryResults){
console.log('Error ' + queryResults);
})
};
/queryUsersFromlast24小时，如下所示：
// Retrieves JSON records for all users who meet a certain set of query conditions
app.post('/queryUsersFromLast24Hours/', function(req, res){
// Grab all of the query parameters from the body.
var lat = req.body.latitude;
var long = req.body.longitude;
var distance = req.body.distance;
var dateNow = new Date(); //right now
// Opens a generic Mongoose Query. Depending on the post body we will...
var query = User.find({});
// ...include filter by Max Distance (converting miles to meters)
if(distance){
// Using MongoDB's geospatial querying features. (Note how coordinates are set [long, lat]
query = query.where('location').near({ center: {type: 'Point', coordinates: [long, lat]},
// Converting meters to miles. Specifying spherical geometry (for globe)
maxDistance: distance * 1609.34, spherical: true});
}
console.log(dateNow);
dateNow.setHours(dateNow.getHours()-24); //24 hours from now
console.log(dateNow);
query = query.where('created_at').gte(dateNow); //gte - greater then equal
// Execute Query and Return the Query Results
query.exec(function(err, users){
if(err)
res.send(err);
// If no errors, respond with a JSON of all users that meet the criteria
res.json(users);
});
});
<button type="button" class="btn btn-danger" ng-click="queryUsersFromLast24Hours()">Show data from last hour</button>
但是现在，如果我想让它更通用，并且返回的数据不是过去24小时的数据，而是用户给出的最后xx小时的数据，我应该如何修改它
我想创建一个Web服务，它不仅可以获取lat/long/distance数据，还可以获取若干小时的POST消息，并返回包含正确数据的json。那么，我应该如何修改前端/后端代码以包含此更改
另外，现在我从gui调用它，如下所示：
// Retrieves JSON records for all users who meet a certain set of query conditions
app.post('/queryUsersFromLast24Hours/', function(req, res){
// Grab all of the query parameters from the body.
var lat = req.body.latitude;
var long = req.body.longitude;
var distance = req.body.distance;
var dateNow = new Date(); //right now
// Opens a generic Mongoose Query. Depending on the post body we will...
var query = User.find({});
// ...include filter by Max Distance (converting miles to meters)
if(distance){
// Using MongoDB's geospatial querying features. (Note how coordinates are set [long, lat]
query = query.where('location').near({ center: {type: 'Point', coordinates: [long, lat]},
// Converting meters to miles. Specifying spherical geometry (for globe)
maxDistance: distance * 1609.34, spherical: true});
}
console.log(dateNow);
dateNow.setHours(dateNow.getHours()-24); //24 hours from now
console.log(dateNow);
query = query.where('created_at').gte(dateNow); //gte - greater then equal
// Execute Query and Return the Query Results
query.exec(function(err, users){
if(err)
res.send(err);
// If no errors, respond with a JSON of all users that meet the criteria
res.json(users);
});
});
<button type="button" class="btn btn-danger" ng-click="queryUsersFromLast24Hours()">Show data from last hour</button>
显示上一小时的数据
那么，我如何修改它来传递将包含在后端查询搜索中的特定小时数呢
非常感谢你的帮助 好吧，如果您总是要减去X小时数，首先我建议您更改Web服务的名称，例如：queryUsersFromLastNHours
假设您将通过单击按钮触发该请求，那么您可以使用如下调用
<button id='myButton' ng-click="queryUsersFromLast24Hours()">MyButton</button>
<input id="numberOfHours" ng-bind="hoursToSubtract" />
为了更好地理解，请阅读
最后，在nodeJs代码中，更改
dateNow.setHours(dateNow.getHours()-24);
为了
好吧，如果你总是要减去X小时，首先我建议你改变你的Web服务的名称，比如：queryUsersFromLastNHours
假设您将通过单击按钮触发该请求，那么您可以使用如下调用
<button id='myButton' ng-click="queryUsersFromLast24Hours()">MyButton</button>
<input id="numberOfHours" ng-bind="hoursToSubtract" />
为了更好地理解，请阅读
最后，在nodeJs代码中，更改
dateNow.setHours(dateNow.getHours()-24);
为了
快速回答：
前端：
// Take query parameters and incorporate into a JSON queryBody
$scope.queryUsers = function(){
// Assemble Query Body
queryBody = {
longitude: parseFloat($scope.formData.longitude),
latitude: parseFloat($scope.formData.latitude),
distance: parseFloat($scope.formData.distance)
hours : Number($scope.formData.hours)
};
// Post the queryBody to the /query POST route to retrieve the filtered results
$http.post('/queryUsers', queryBody)
// Store the filtered results in queryResults
.success(function(queryResults){
console.log(JSON.stringify(queryBody));
// Pass the filtered results to the Google Map Service and refresh the map
gservice.refresh(queryBody.latitude, queryBody.longitude, queryResults);
// Count the number of records retrieved for the panel-footer
$scope.queryCount = queryResults.length;
})
.error(function(queryResults){
console.log('Error ' + queryResults);
})
};
后端：
// Retrieves JSON records for all users who meet a certain set of query conditions
app.post('/queryUsers/', function(req, res){
// Grab all of the query parameters from the body.
var lat = req.body.latitude;
var long = req.body.longitude;
var distance = req.body.distance;
var hours = req.body.hours
var dateNow = new Date(); //right now
// Opens a generic Mongoose Query. Depending on the post body we will...
var query = User.find({});
// ...include filter by Max Distance (converting miles to meters)
if(distance){
// Using MongoDB's geospatial querying features. (Note how coordinates are set [long, lat]
query = query.where('location').near({ center: {type: 'Point', coordinates: [long, lat]},
// Converting meters to miles. Specifying spherical geometry (for globe)
maxDistance: distance * 1609.34, spherical: true});
}
console.log(dateNow);
dateNow.setHours(dateNow.getHours()- hours); // XX hours from now
console.log(dateNow);
query = query.where('created_at').gte(dateNow); //gte - greater then equal
// Execute Query and Return the Query Results
query.exec(function(err, users){
if(err)
res.send(err);
// If no errors, respond with a JSON of all users that meet the criteria
res.json(users);
});
});
抱歉，如果我误解了您的问题，但我想给您一些提示，此查询看起来像GET而不是POST，您可以使用查询参数或路径参数。快速回答：
前端：
// Take query parameters and incorporate into a JSON queryBody
$scope.queryUsers = function(){
// Assemble Query Body
queryBody = {
longitude: parseFloat($scope.formData.longitude),
latitude: parseFloat($scope.formData.latitude),
distance: parseFloat($scope.formData.distance)
hours : Number($scope.formData.hours)
};
// Post the queryBody to the /query POST route to retrieve the filtered results
$http.post('/queryUsers', queryBody)
// Store the filtered results in queryResults
.success(function(queryResults){
console.log(JSON.stringify(queryBody));
// Pass the filtered results to the Google Map Service and refresh the map
gservice.refresh(queryBody.latitude, queryBody.longitude, queryResults);
// Count the number of records retrieved for the panel-footer
$scope.queryCount = queryResults.length;
})
.error(function(queryResults){
console.log('Error ' + queryResults);
})
};
后端：
// Retrieves JSON records for all users who meet a certain set of query conditions
app.post('/queryUsers/', function(req, res){
// Grab all of the query parameters from the body.
var lat = req.body.latitude;
var long = req.body.longitude;
var distance = req.body.distance;
var hours = req.body.hours
var dateNow = new Date(); //right now
// Opens a generic Mongoose Query. Depending on the post body we will...
var query = User.find({});
// ...include filter by Max Distance (converting miles to meters)
if(distance){
// Using MongoDB's geospatial querying features. (Note how coordinates are set [long, lat]
query = query.where('location').near({ center: {type: 'Point', coordinates: [long, lat]},
// Converting meters to miles. Specifying spherical geometry (for globe)
maxDistance: distance * 1609.34, spherical: true});
}
console.log(dateNow);
dateNow.setHours(dateNow.getHours()- hours); // XX hours from now
console.log(dateNow);
query = query.where('created_at').gte(dateNow); //gte - greater then equal
// Execute Query and Return the Query Results
query.exec(function(err, users){
if(err)
res.send(err);
// If no errors, respond with a JSON of all users that meet the criteria
res.json(users);
});
});
抱歉，如果我误解了您的问题，但我想给您一些提示，此查询看起来像GET而不是POST，您可以使用查询参数或路径参数。前端：
$http.post('/recentUsers?numHours=24', queryBody)
后端：
var numberOfHours;
if (req.query.numHours) {
try {
numberOfHours = parseInt(req.query.numHours)
} catch(e) {}
}
numberOfHours = numberOfHours || 24; // default to 24 hours.
dateNow.setHours(dateNow.getHours() - numberOfHours)
前端：
$http.post('/recentUsers?numHours=24', queryBody)
后端：
var numberOfHours;
if (req.query.numHours) {
try {
numberOfHours = parseInt(req.query.numHours)
} catch(e) {}
}
numberOfHours = numberOfHours || 24; // default to 24 hours.
dateNow.setHours(dateNow.getHours() - numberOfHours)
谢谢，你能告诉我你为什么在这里写5
：hoursToSubtract:5
？另外，现在在我的gui中，我通过单击按钮调用它。
ng click=“queryUsersFromLast24Hours（）”ng click=“queryUsersFromLast24Hours（5）”5hoursToSubtract:5ng click=“queryUsersFromLast24Hours（5）”ng click=“queryUsersFromLast24Hours（）”ng click=“queryUsersFromLast24Hours（）”