[英]Fixed position command prompt in Node.js
有没有办法将命令提示符(只是一个question
提示或类似的东西)固定到终端的底部,并使用Node.js记录它上面的输出。
一个非常糟糕的例子:
Your favourite food is sushi.
Your favourite food is chicken.
Your favourite food is okra.
--> What is your favourite food?
基本上,我希望用户始终能够键入,并在输入上方回显输入。
interface.question("What is your favourite food?", function(answer) {
// output the answer above where this prompt was
// and somehow keep this same prompt where is is
});
我希望使用它的特定应用程序是一个简单的IRC客户端,我有一个供用户键入的位置,并且输出所有输出(用户键入的内容,以及其他人也键入的内容)用户正在打字。 下图中的线是虚构的。
----------------------------------------------------------------------
| |
| |
| |
| |
| |
| |
| |
| Stuff |
| Stuff |
| Stuff |
----------------------------------------------------------------------
| --> The user can type here |
----------------------------------------------------------------------
process.stdout.write("\x1Bc")
console.log(Array(process.stdout.rows + 1).join('\n'));
const myRL = require("serverline")
myRL.init()
myRL.getRL().question("What is your favourite food? ", function(answer) {
console.log(`Your favourite food is ${answer}.`)
});
function main() {
let i = 0
setInterval(function() {
const num = () => Math.floor(Math.random() * 255) + 1
i++
console.log(i + " " + num() + "." + num() + "." + num() + " user connected.")
}, 700)
}
main()
旧版 :
好吧,我正在使用询问者来解决这类问题..它已经解决了所有这些问题。它很容易使用,你有不同类型的propmt类型。
这里有一个litle示例来形成doc:
var inquirer = require('inquirer');
inquirer.prompt([/* Pass your questions in here */]).then(function (answers) {
// Use user feedback for... whatever!!
});
这是一个简单的解决方案(在macos上使用node v6.4.0进行测试):
const readline = require('readline');
const rl = readline.createInterface(process.stdin, process.stdout);
// Logs a message keeping prompt on last line
function log(message) {
readline.cursorTo(process.stdout, 0);
console.log(message);
rl.prompt(true);
}
// Testing the solution
rl.question('Enter something...:', userInput => {
log('You typed ' + userInput);
rl.close();
});
log('this should appear above the prompt');
setTimeout(
() => log('this should appear above the prompt'),
1000
);
只需使用readline核心模块:
var readline = require('readline');
var rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
rl.question("What do you think of node.js? ", function(answer) {
console.log("Thank you for your valuable feedback:", answer);
rl.close();
});
这将解决您的问题:
var readline = require('readline');
var rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
var fav_foods = [];
var ask_question = function() {
rl.question("What is your favourite food? ", function(answer) {
fav_foods.push(answer)
fav_foods.forEach(function (element) {
console.log("Your favourite food is " + element)
})
ask_question()
});
}
ask_question()
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