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js: Tolerate the non-existence of some HTML elements

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Specifically, the permalinks, the apology, and the resizable div.
This commit is contained in:
Ben Harris
2022-10-29 11:58:37 +01:00
parent ea4ba47662
commit 06f6e878a0
2 changed files with 76 additions and 65 deletions
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7
emcclib.js
View File

@ -166,8 +166,10 @@ mergeInto(LibraryManager.library, {
*/
js_update_permalinks: function(desc, seed) {
desc = encodeURI(UTF8ToString(desc)).replace(/#/g, "%23");
if (permalink_desc !== null)
permalink_desc.href = "#" + desc;
if (permalink_seed !== null) {
if (seed == 0) {
permalink_seed.style.display = "none";
} else {
@ -175,6 +177,7 @@ mergeInto(LibraryManager.library, {
permalink_seed.href = "#" + seed;
permalink_seed.style.display = "";
}
}
},
/*
@ -547,7 +550,9 @@ mergeInto(LibraryManager.library, {
js_canvas_set_size: function(w, h) {
onscreen_canvas.width = w;
offscreen_canvas.width = w;
resizable_div.style.width = w / (window.devicePixelRatio || 1) + "px";
if (resizable_div !== null)
resizable_div.style.width =
w / (window.devicePixelRatio || 1) + "px";
onscreen_canvas.height = h;
offscreen_canvas.height = h;

14
emccpre.js
View File

@ -472,6 +472,7 @@ function initPuzzle() {
ctx.stroke();
}
resizable_div = document.getElementById("resizable");
if (resizable_div !== null) {
resizable_div.appendChild(resize_handle);
resize_handle.id = "resizehandle";
resize_handle.title = "Drag to resize the puzzle. Right-click to restore the default size.";
@ -479,15 +480,18 @@ function initPuzzle() {
var resize_xoffset = null, resize_yoffset = null;
var resize_puzzle = Module.cwrap('resize_puzzle',
'void', ['number', 'number']);
var restore_puzzle_size = Module.cwrap('restore_puzzle_size', 'void', []);
var restore_puzzle_size = Module.cwrap('restore_puzzle_size',
'void', []);
resize_handle.oncontextmenu = function(event) { return false; }
resize_handle.onmousedown = function(event) {
if (event.button == 0) {
var xy = element_coords(onscreen_canvas);
resize_xbase = xy.x + onscreen_canvas.offsetWidth / 2;
resize_ybase = xy.y;
resize_xoffset = xy.x + onscreen_canvas.offsetWidth - event.pageX;
resize_yoffset = xy.y + onscreen_canvas.offsetHeight - event.pageY;
resize_xoffset =
xy.x + onscreen_canvas.offsetWidth - event.pageX;
resize_yoffset =
xy.y + onscreen_canvas.offsetHeight - event.pageY;
} else {
restore_pending = true;
}
@ -529,6 +533,7 @@ function initPuzzle() {
event.preventDefault();
}
});
}
/*
* Arrange to detect changes of device pixel ratio. Adapted from
@ -558,7 +563,8 @@ function initPuzzle() {
// we haven't crashed for one reason or another during setup, then
// it's probably safe to hide the 'sorry, no puzzle here' div and
// show the div containing the actual puzzle.
document.getElementById("apology").style.display = "none";
var apology = document.getElementById("apology");
if (apology !== null) apology.style.display = "none";
document.getElementById("puzzle").style.display = "";
};
}