Downloading files embedded

[donmor3000]

The "Download Empty" button in the wiki page does not work in my app. I'm not sure whether this function can be handled by injecting js, just like saving function handled by TiddlyFox or TiddlyDesktop. The button invokes an method in $:/core/modules/widgets/action-sendmessage.js, which will pass an url begins with "blob:" to the browser, but WebView won't support this scheme. I'm now finding a way to change the blob things to a base64 string so that I can decode it to a byte array. Anyone can help? :-)

[Jeremy Ruston]

Hi Donmor

The "Download Empty" button in the wiki page does not work in my app. I'm not sure whether this function can be handled by injecting js, just like saving function handled by TiddlyFox or TiddlyDesktop. The button invokes an method in $:/core/modules/widgets/action-sendmessage.js, which will pass an url begins with "blob:" to the browser, but WebView won't support this scheme. I'm now finding a way to change the blob things to a base64 string so that I can decode it to a byte array. Anyone can help? :-)

Just to be clear, does ordinary saving work in your app? Have you injected a custom saver?

Downloads are handled by the same saver module mechanism that we use for saving, but with the “method” parameter to the saver passed as “download” instead of “save” or “autosave”.

Perhaps you can share some more details of how your app is working at the moment?

Best wishes

Jeremy

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[donmor3000]

My app injects a js to TiddlyWiki webview, which is a modified version of scripts inside the desktop app TiddlyDesktop:

var enableSaving = function(doc) {

            var messageBox = doc.createElement("div");

            messageBox.id = "tiddlyfox-message-box";

            doc.body.appendChild(messageBox);

            messageBox.addEventListener("tiddlyfox-save-file",function(event) {

                var message = event.target,

                filepath = message.getAttribute("data-tiddlyfox-path"),

                content = message.getAttribute("data-tiddlyfox-content");

                window.client.saveWiki(filepath,content);

                message.parentNode.removeChild(message);

                var event = doc.createEvent("Events");

                event.initEvent("tiddlyfox-have-saved-file",true,false);

                event.savedFilePath = filepath; message.dispatchEvent(event);

                return false;

            },false);

        };

        enableSaving(document);

It seems that the code provides no downloading interface. The only thing they do is to get the content of current page.

在 2019年4月27日星期六 UTC+8下午9:49:39，Jeremy Ruston写道：

Hi Donmor

The "Download Empty" button in the wiki page does not work in my app. I'm not sure whether this function can be handled by injecting js, just like saving function handled by TiddlyFox or TiddlyDesktop. The button invokes an method in $:/core/modules/widgets/action-sendmessage.js, which will pass an url begins with "blob:" to the browser, but WebView won't support this scheme. I'm now finding a way to change the blob things to a base64 string so that I can decode it to a byte array. Anyone can help? :-)

Just to be clear, does ordinary saving work in your app? Have you injected a custom saver?

Downloads are handled by the same saver module mechanism that we use for saving, but with the “method” parameter to the saver passed as “download” instead of “save” or “autosave”.

Perhaps you can share some more details of how your app is working at the moment?

Best wishes

Jeremy

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[Jeremy Ruston]

Hi Donmor

It seems that the code provides no downloading interface. The only thing they do is to get the content of current page.

That makes sense. For TiddlyDesktop, nw.js does permit the ordinary download mechanism. Sadly, the TiddlyFox saver doesn’t support downloading.

So, there might be a few ways to approach this:

* Research ways to enable the ordinary download mechanism within your web view. You may find https://github.com/Jermolene/FileSavingDemo useful; it’s a minimal test case for TW5’s download saver mechanism

* Inject a new saver module that works similarly to the TiddlyFox one except that it supports downloading as well as saving

Best wishes

Jeremy

在 2019年4月27日星期六 UTC+8下午9:49:39，Jeremy Ruston写道：

Hi Donmor

The "Download Empty" button in the wiki page does not work in my app. I'm not sure whether this function can be handled by injecting js, just like saving function handled by TiddlyFox or TiddlyDesktop. The button invokes an method in $:/core/modules/widgets/action-sendmessage.js, which will pass an url begins with "blob:" to the browser, but WebView won't support this scheme. I'm now finding a way to change the blob things to a base64 string so that I can decode it to a byte array. Anyone can help? :-)

Just to be clear, does ordinary saving work in your app? Have you injected a custom saver?

Downloads are handled by the same saver module mechanism that we use for saving, but with the “method” parameter to the saver passed as “download” instead of “save” or “autosave”.

Perhaps you can share some more details of how your app is working at the moment?

Best wishes

Jeremy

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[donmor3000]

Thanks a lot! I managed to enable the green button, though it fails if the tiddler in the button is changed.
BTW what kind of public license should I use with my app? Is it OK to use GPLv2? Here's my git url: https://github.com/donmor/Tiddloid

[Jeremy Ruston]

Hi Donmor

Thanks a lot! I managed to enable the green button, though it fails if the tiddler in the button is changed.

Can you show the relevant code?

BTW what kind of public license should I use with my app? Is it OK to use GPLv2? Here's my git url: https://github.com/donmor/Tiddloid

Yes, but I personally favour BSD because it places fewer obligations on the user and thus improves adoption.

Best wishes

Jeremy

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[donmor3000]

<$button class="tc-btn-big-green">

<$action-sendmessage $message="tm-download-file" $param="$:/editions/tw5.com/download-empty" filename="empty.html"/>

Download Empty {{$:/core/images/save-button}}

</$button>

I replaced the param with another tiddler containing binary and it doesn't work.


在 2019年5月12日星期日 UTC+8上午12:36:57，Jeremy Ruston写道：

Hi Donmor

Thanks a lot! I managed to enable the green button, though it fails if the tiddler in the button is changed.

Can you show the relevant code?

BTW what kind of public license should I use with my app? Is it OK to use GPLv2? Here's my git url: https://github.com/donmor/Tiddloid

Yes, but I personally favour BSD because it places fewer obligations on the user and thus improves adoption.

Best wishes

Jeremy

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