我已经编写了一个验证库,我希望能够在Node中同步和异步调用。我尝试过使用async / co的promises但是我 无法到达任何地方。有没有人对如何使这段代码同步有一个很好的建议?我试图从验证工厂调用它,返回的查找与数据库异步。
var lookupFactory = require('../lookup/lookupFactory');
var Promise = require("bluebird");
var async = require('async');
exports.validate = function (required, field, errors) {
if (required && field.value == null) {
errors.push('Field is required');
return;
}
var lookupType = field.validation.lookupType;
var s = lookupFactory.lookup(lookupType);
s.validate('12', function (err, data) {
if (data.length != 1) {
errors.push('Field value is not valid');
}
});
};
答案 0 :(得分:0)
我喜欢promisses。
exports.validate = function (required, field, errors) {
return new Promise(function(fulfill) {
if (required && field.value == null) {
errors.push('Field is required');
return;
}
var lookupType = field.validation.lookupType;
var s = lookupFactory.lookup(lookupType);
s.validate('12', function (err, data) {
if (data.length != 1) {
errors.push('Field value is not valid');
}
fulfill(null /*Argument passed to the other function*/); //Is it here the code end?
});
});
}
答案 1 :(得分:0)
exports.validate = function (required, field) {
var lookupType = field.validation.lookupType;
var s = lookupFactory.lookup(lookupType);
return new Promise(function(resolve, reject) {
if (required && field.value == null) {
return reject('Field is required');
}
s.validate('12', function (err, data) {
if(err) {
return reject(err);
} else if (data.length != 1) {
return reject('Field value is not valid');
}
resolve(data);
});
});
}
使用示例:
validate(true, 'name')
.then(function(data) { console.log('Validation succeeded:', data); },
function(reason) { console.log('Validation failed:', reason); });