How to use the download API in chrome extension

[jaaf]

Hi

I am writting an extension that uses a data file (dictionary like file).

I would like to allow the user to update this data file using a button whether in the popup or the options page to trigger the download from a given server.

I mentionned this in the manifest the following way :

"permissions": [
    "downloads",
    "http://sousdomain.domain.com/HorsDrupal/data/"],




I placed a button in the popup to call an update function in the javascript of the popup.





function updateDict(){


chrome.downloads.download( {url: "http://sousdomain.domain.com/HorsDrupal/data/BasqueFr.txt", filename: "chrome.extension://@@extension_id/"}) 
}

  I got the following answer in the console of the popup 


Error during downloads.download: I'm afraid I can't do that.                       sendRequest:22
chromeHidden.handleResponse                                                        sendRequest:22



The problem is the same if I place the button and the javascript in the options page.

I also tried an alternative method indicated in the samples


function updateDict(){

chrome.downloads.onDeterminingFilename.addListener(function(item, suggest) {
  suggest({filename: item.filename,
           conflict_action: 'overwrite'});
 });
}




This time the answer is




Uncaught TypeError: Cannot call method 'addListener' of undefined                       popup.js:41
updateDict                                                                              popup.js:41



I guess this example is not complete. 

I must confess I have trouble understanding this API as the examples are very laconic. 

I need some help. Thanks in advance.

[benjh...@chromium.org]

On Wednesday, June 26, 2013 5:59:26 AM UTC-7, jaaf wrote:
> Hi
> I am writting an extension that uses a data file (dictionary like file).
> I would like to allow the user to update this data file using a button whether in the popup or the options page to trigger the download from a given server.
> I mentionned this in the manifest the following way :
>
>
>
> "permissions": [
>     "downloads",
>     "http://sousdomain.domain.com/HorsDrupal/data/"],
>
>
> I placed a button in the popup to call an update function in the javascript of the popup.
>
>
>
>
> function updateDict(){
>
>
> chrome.downloads.download( {url: "http://sousdomain.domain.com/HorsDrupal/data/BasqueFr.txt", filename: "chrome.extension://@@extension_id/"}) 

The characters ':' and '/' are invalid. Try this instead:
chrome.downloads.download({url:"http://sousdomain.domain.com/HorsDrupal/data/BasqueFr.txt", filename: chrome.i18n.getMessage("@@extension_id")});

I'll make the error messages more helpful.

> }
>   I got the following answer in the console of the popup 
>
>
>
>
> Error during downloads.download: I'm afraid I can't do that.                       sendRequest:22
> chromeHidden.handleResponse                                                        sendRequest:22
>
>
>
>
> The problem is the same if I place the button and the javascript in the options page.
>
>
> I also tried an alternative method indicated in the samples
>
>
>
>
> function updateDict(){
>
> chrome.downloads.onDeterminingFilename.addListener(function(item, suggest) {
>   suggest({filename: item.filename,
>            conflict_action: 'overwrite'});
>  });
> }
>
>
> This time the answer is
>
>
>
> Uncaught TypeError: Cannot call method 'addListener' of undefined                       popup.js:41
> updateDict                                                                              popup.js:41

That looks like a bug. What version of chrome are you using?