所以我想从一个无极的提供者的反应,但我并没有多少运气。
我从未组件接收到响应,
this.printerService.print(template).then(
response => {
console.log(response);
}, err => {
console.log(err);
});
而我的提供商返回true,
print(template): Promise<any> {
return window.cordova.plugin.zebraprinter.print(address, join,
function(success) {
return true;
}, function(fail) {
return false;
}
);
}
不必返回一个承诺是你似乎什么希望。
print(template): Promise<bool> {
return new Promise(resolve => {
window.cordova.plugin.zebraprinter.print(address, join,
success => resolve(true), // invokes .then() with true
fail => resolve(false) // invokes .then() with false
);
});
}
exampleCall() {
this.printerService.print(template).then(answer => console.log(answer));
}
如果你想的承诺失败,你可以用拒绝的说法。
print(template): Promise<void> {
return new Promise((resolve, reject) => {
window.cordova.plugin.zebraprinter.print(address, join,
success => resolve(), // invokes .then() without a value
fail => reject() // invokes .catch() without a value
);
});
}
exampleCall() {
this.printerService.print(template)
.then(() => console.log('success'))
.catch(() => console.log('fail'));
}
一个简单的方法来实现这一目标,是在像这样一个承诺包裹zebraprinter功能:
print(template): Promise<any> {
return new Promise((resolve,reject)=> {
window.cordova.plugin.zebraprinter.print(address, join,
(success) => {
resolve(success)
},(fail) => {
reject(fail)
}
);
});
}