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Support for saving games in Javascript puzzles.

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This is done by getting midend_serialise to produce the complete
saved-game file as an in-memory string buffer, and then encoding that
into a data: URI which we provide to the user as a hyperlink in a
dialog box. The hyperlink has the 'download' attribute, which means
clicking on it should automatically offer to save the file, and also
lets me specify a not-too-silly default file name.
This commit is contained in:
Simon Tatham
2017-09-05 20:10:16 +01:00
parent b31ea22167
commit 1bf591a573
4 changed files with 73 additions and 0 deletions
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26
emccpre.js
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@ -296,6 +296,32 @@ function initPuzzle() {
command(9);
};
// 'number' is used for C pointers
get_save_file = Module.cwrap('get_save_file', 'number', []);
free_save_file = Module.cwrap('free_save_file', 'void', ['number']);
document.getElementById("save").onclick = function(event) {
if (dlg_dimmer === null) {
var savefile_ptr = get_save_file();
var savefile_text = Pointer_stringify(savefile_ptr);
free_save_file(savefile_ptr);
dialog_init("Download saved-game file");
dlg_form.appendChild(document.createTextNode(
"Click to download the "));
var a = document.createElement("a");
a.download = "puzzle.sav";
a.href = "data:application/octet-stream," +
encodeURIComponent(savefile_text);
a.appendChild(document.createTextNode("saved-game file"));
dlg_form.appendChild(a);
dlg_form.appendChild(document.createTextNode("."));
dlg_form.appendChild(document.createElement("br"));
dialog_launch(function(event) {
dialog_cleanup();
});
}
};
gametypelist = document.getElementById("gametype");
gametypesubmenus.push(gametypelist);