chrome.filesystem保存没有提示位置的文件 [英] chrome.filesystem save file without prompt location

问题描述

我可以将文件保存在自定义位置（ / home / Users / user1 / ），名称 file1.txt 。

我有这样的代码：

  chrome.fileSystem.chooseEntry （{type：'openDirectory'}，function（entry）{
 chrome.fileSystem.getWritableEntry（entry，function（entry）{
 entry.getFile（'file1.txt'，{create：true} ，函数（entry）{
 entry.createWriter（function（writer）{
 writer.write（new Blob（['Lorem']，{type：'text / plain'}））; 
}）; 
}）; 
}）; 
}）; 
  

有了这段代码，我得到了提示，所以我需要选择目录，但是我想没有这个，我想要在设置中声明目录位置。

任何解决方案？

编辑

根据@Xan接受的答案：

  //设置位置
 $（'＃location_field'）。on（'click'，function（）{
 chrome.fileSystem.chooseEntry（{type：'openDirectory'}，function（entry）{
 chrome.storage.sync.set（{'print_location'：chrome.fileSystem.retainEntry（entry）}）; 
}）; 
}）; 
 
 //获取位置
 var print_location = null; 
 chrome.storage.sync.get（{
 print_location：null 
}，function（items）{
 chrome.fileSystem.restoreEntry（items.print_location，function（entry）{ 
 print_location = entry; 
}）; 
}）; 
 
 //保存文件
 chrome.fileSystem.getWritableEntry（print_location，function（entry）{
 entry.getFile（'file1.txt'，{create：true}，function （entry）{
 entry.createWriter（function（writer）{
 writer.write（new Blob（['Lorem']，{type：'text / plain'}））; 
 }）; 
}）; 
}）; 
  

解决方案

您无法预先选择可读/写的路径 - 它始终必须通过用户确认才能获得Entry对象。不过，如果你声明了retainEntries子权限，那么你只需要询问一次，然后重用该条目。

$ / $> $ / $> b
$ b

请参阅 retainEntry 和 restoreEntry 。

另外，您可以尝试为<$ c提供 suggestedName $ c> chooseEntry ，如果你知道你想要的理想位置。我不确定如果你提供了绝对路径，它是否会工作。

can i save file in custom location (/home/Users/user1/) with name file1.txt.

I have this code:

chrome.fileSystem.chooseEntry({type:'openDirectory'}, function(entry) {
    chrome.fileSystem.getWritableEntry(entry, function(entry) {
        entry.getFile('file1.txt', {create:true}, function(entry) {
            entry.createWriter(function(writer) {
                writer.write(new Blob(['Lorem'], {type: 'text/plain'}));
            });
        });
    });
});

With this code, i get prompt so i need to choose directory, but i want without that, i wanna declare directory location in settings.

Any solution for this?

EDIT

According to accepted answer from @Xan :

// set location
$('#location_field').on('click', function(){
    chrome.fileSystem.chooseEntry({type:'openDirectory'}, function(entry) {
        chrome.storage.sync.set({'print_location': chrome.fileSystem.retainEntry(entry)});
    });
});

// get location 
var print_location = null;
chrome.storage.sync.get({
    print_location: null
}, function(items){
    chrome.fileSystem.restoreEntry(items.print_location, function(entry){
        print_location = entry;
    });
});

// save file
chrome.fileSystem.getWritableEntry(print_location, function(entry) {
    entry.getFile('file1.txt', {create:true}, function(entry) {
        entry.createWriter(function(writer) {
            writer.write(new Blob(['Lorem'], {type: 'text/plain'}));
        });
    });
});

解决方案

No. You cannot pre-select a path to be readable/writable - it always has to go through a user confirmation to gain the Entry object. Consider it a security feature.

However, if you declare the "retainEntries" sub-permission, you can ask only once and then reuse the entry.

See documentation for retainEntry and restoreEntry.

Also, you may try to provide a suggestedName for chooseEntry if you know where you want it to ideally be. I'm not sure if it will work if you provide an absolute path though.

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