询问用户使用Node.js保存文件的位置 [英] Ask user where to save file with Node.js
问题描述
我正在使用node-webkit创建一个应用程序,所以有很多javascript。我编写了一个node.js函数,它将拍摄一个屏幕截图并将其保存到磁盘,但是,它将它保存到项目根目录,我想提示用户选择一个保存位置,但我找不到创建保存文件对话框的方法。当前代码:
I'm creating an app using node-webkit, so there's a lot of javascript. I have written a node.js function that will take a screen shot and save it to the disk, however, it saves it to the project root dir and I would like to prompt the user to choose a save location, but I cannot find a way to create a save file dialog. Current code:
screen_shot.js:
screen_shot.js:
var fs = require('fs');
exports.buildFile = function(name, value) {
var img = new Buffer(value, encoding='base64');
fs.writeFile(name, img, function(err) {
if(err) {
console.log(err);
} else {
console.log("The file was saved!");
}
});
};
index.html:
index.html:
...
<script>
var sc= require('screen_shot');
function wait() {
$('#close-popup').click();
setTimeout(function() {screen_shot()}, 10);
}
function screen_shot() {
html2canvas($('body'), {
onrendered: function(canvas) {
var img = canvas.toDataURL("image/png").split(',')[1];
var decodedImg = window.atob(img);
sc.buildFile("sc.png", img);
}
});
}
</script>
...
<a href="#" onclick="wait();" data-role="button" data-theme="j">Screen shot</a>
等待函数只是为了给弹出窗口我在截屏之前有时间关闭。
The wait function is just to give the popup I'm using time to close before the screenshot is taken.
我一直在阅读 node-webkit文件对话框文档但它不是我正在寻找的,或者我无法正常工作。
I have been reading the node-webkit file dialog doc but it is either not what I'm looking for or I cannot make it work properly.
推荐答案
Wiki中的文件对话框页面提到保存对话框文件输入
The File Dialog page in the Wiki mentions a save dialog file input
nwsaveas将打开一个另存为对话框,允许用户输入文件的路径,并且可以选择与默认文件输入标记不同的不存在文件:
nwsaveas will open a save as dialog which let user enter the path of a file, and it's possible to select a non-exist file which is different with the default file input tag:
您可以在自定义对话框中使用它,如模态或者查询用户输入的内容。
You could use that in an custom dialog like a modal or so to query the user for that input.
基于您提供的代码的非常基本的示例:
Very basic example based on your provided code:
<script>
var fs = require('fs');
var buildFile = function(name, value) {
var img = new Buffer(value, 'base64');
fs.writeFile(name, img, function(err) {
if(err) {
console.log(err);
} else {
console.log("The file was saved!");
}
});
}
function wait() {
$('#close-popup').click();
setTimeout(function() {screen_shot()}, 10);
}
function screen_shot() {
html2canvas($('body'), {
onrendered: function(canvas) {
var img = canvas.toDataURL("image/png").split(',')[1];
var decodedImg = window.atob(img);
query_for_save_path(function (save_path) {
buildFile(save_path, img);
alert('Screenshot saved to: ' + save_path);
});
}
});
}
function query_for_save_path(cb) {
$('#dialog').show();
$('#dialog input').one('change', function (event) {
cb($(this).val());
});
}
</script>
<a href="#" onclick="wait();" data-role="button" data-theme="j">Screen shot</a>
<div id="dialog" style="display:none;">
Choose a path to save your shot:
<input type="file" nwsaveas />
</div>
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