I want to iterate through a list and rename a few files in Windows 8 / Javascript. Therefore, I wrote a function called "renameFile" and I call this function within a loop, like this:
list.forEach(function (value, index, array) {
var filename = index;
var newfilename = index+1;
renameFile(filename, newfilename);
});
function renameFile(filename, newfilename) {
Windows.Storage.ApplicationData.current.localFolder.getFileAsync(filename).then(function (sampleFile) {
sampleFile.renameAsync(newfilename).done(
function complete(result) {
},
function error(error) {
console.log("error" + error);
}
);
});
}
The problem is: The rename function is asynchronous and it seems that sometimes, the renaming works and sometimes not: In most cases, only the first element of the list is renamed. How can I tell the loop to wait, till the rename-process of the first item in the list is finished and then go an with the second, third, ... item?
Cheers
Well I did a fast lookup and you're out of luck. It seems like the StorageFolder class only has Asyn functions for what you're looking for. But it's not the end.
The easiest solution I have to do use a recursive function. And call the function with a different index.
function renameFile(filename, newfilename, list, index) {
Windows.Storage.ApplicationData.current.localFolder.getFileAsync(filename).then(function (sampleFile) {
sampleFile.renameAsync(newfilename).done(
function complete(result) {
renameList(list, index);
},
function error(error) {
console.log("error" + error);
}
);
});
function renameList(list, index) {
if(index >= list.length) return;
renameFile(index, index+1, list, index+1);
}
renameList(list, 0);
It's not very clean but it should work, this will force the code to be synchrone since you're calling from within a callback.
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