Dynamic Event Creation causing TypeError
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Original Source
- Original title: Dynamic Event Creation causing TypeError
- Original author: p0_boy
- Original date: August 5, 2019
- Source thread: https://forums.rpgmakerweb.com/threads/dynamic-event-creation-causing-typeerror.111834/
- Source forum path: Game Development Engines > RPG Maker Javascript Plugins > Javascript/Plugin Support
Summary
Aloha, folks- I have a plug-in with the following function (MapCrowd()): Code: // Reads current map's [Note] field and assigns events to specified regions.
Archived First Post
Aloha, folks-
I have a plug-in with the following function (MapCrowd()):
As the comments in the code remark, it basically reads the <clone> tag from the [Notes] field of maps, and places events on specified regions.
After placing MapCrowd() in aliases of Game_Map.prototype.setup, Game_Map.prototype.setupEvents, Scene_Map.prototype.initialize, and getting errors (to do with trying to read meta of null, I assume because $dataMap had not yet been loaded), I finally got it working by placing it in
Scene_Map.prototype.onMapLoaded:
This was only partially successful though (please excuse the rudimentary graphics):
Everything loads okay, however a TypeError occurs after I exit the game menu:
I am hoping that somebody can point me to a better way that I can go about running MapCrowd() upon loading of a map?
Thank you in advance!
EDIT (08/06/2019 7:26 AM [GMT +8]):
The problem doesn't have to do with Scene_Map.prototype.onMapLoaded as I originally assumed, it seems to be a problem with dynamically creating events.
As a comparison, I removed the plug-in that I wrote and tried to use another, similar plug-in that I found (while scouring Google for a solution)- Alphaxaon's EventWrapper.js.
I typed the following commands in the console (as per the plug-in's instructions):
And it seemed to be all gravy, until I tried entering and exiting the game menu again and encountered the same "Cannot read property 'pages' of null" TypeError:
Does anybody know what I am doing wrong?
I have disabled all other plug-ins except for Community_Basic, so I know there aren't any external conflicts.
Any help would be much appreciated. Thanks!
EDIT 2 (08/06/2019 12:15 [GMT +8])
Since nobody seems to have a clue about this, I just re-wrote my plug-in to use Galv's Event Spawner as the method for creating the events.
It's kind of a pain because the Galv's plug-in requires the use of a "Spawn Map" to draw events from, but at least it isn't giving me the TypeError any more.
Below is the less exciting, MapCrowd() revision.
PlaceEvent() calls Galv.SPAWN.event to create the events.
Subsequently I also had to rewrite a few other things to get everything working again- Galv's plug-in uses a custom global $dataSpawnMap, which I needed to reference (instead of $dataMap) to read the [Note] field of the newly spawned events.
That's all folks!
I have a plug-in with the following function (MapCrowd()):
Code:
// Reads current map's [Note] field and assigns events to specified regions.
function MapCrowd() {
// Check that <clone> tag is present in [Note] field.
if ($dataMap.meta.clone != undefined) {
let clone_event = 0;
// Separates multiple RegionIds/Events and places them in an array.
let crowd = ($dataMap.meta.clone.replace(/\s/g, ``)).split(`;`);
// Perform placement of events on regions.
for (let clones = 0; clones < crowd.length; clones++) {
let temporary = crowd[clones].split(`|`);
let regionId = Number(temporary[0]);
// Checks if event source is internal or external source (CloneBank.json)
if (isNaN(temporary[1]) === true) {
if (temporary[1].charAt(0) === `$`) {
let clone_bank = RootFolder() + `/data/` + `CloneBank.json`;
if (FileExists(clone_bank) === true) {
let raw_json = load_text_file(clone_bank);
let clone_objects = JSON.parse(raw_json);
clone_event = Object.assign({}, clone_objects.events[temporary[1].substr(1)]);
}
}
} else {
clone_event = Number(temporary[1]);
}
// Place events on specified regions.
if (clone_event != 0) $.PlaceEvent(clone_event, regionId);
}
}
};As the comments in the code remark, it basically reads the <clone> tag from the [Notes] field of maps, and places events on specified regions.
After placing MapCrowd() in aliases of Game_Map.prototype.setup, Game_Map.prototype.setupEvents, Scene_Map.prototype.initialize, and getting errors (to do with trying to read meta of null, I assume because $dataMap had not yet been loaded), I finally got it working by placing it in
Scene_Map.prototype.onMapLoaded:
Code:
// Executes upon map load.
var alias_Scene_Map_onMapLoaded = Scene_Map.prototype.onMapLoaded;
Scene_Map.prototype.onMapLoaded = function() {
// Established map load routines.
alias_Scene_Map_onMapLoaded.call(this);
// Plug-in addendum.
MapCrowd();
}Everything loads okay, however a TypeError occurs after I exit the game menu:
I am hoping that somebody can point me to a better way that I can go about running MapCrowd() upon loading of a map?
Thank you in advance!
EDIT (08/06/2019 7:26 AM [GMT +8]):
The problem doesn't have to do with Scene_Map.prototype.onMapLoaded as I originally assumed, it seems to be a problem with dynamically creating events.
As a comparison, I removed the plug-in that I wrote and tried to use another, similar plug-in that I found (while scouring Google for a solution)- Alphaxaon's EventWrapper.js.
I typed the following commands in the console (as per the plug-in's instructions):
Code:
var event = new MapEvent();
event.copyActionsFromEventOnMap(1,1);
event.spawn(2,4);And it seemed to be all gravy, until I tried entering and exiting the game menu again and encountered the same "Cannot read property 'pages' of null" TypeError:
Does anybody know what I am doing wrong?
I have disabled all other plug-ins except for Community_Basic, so I know there aren't any external conflicts.
Any help would be much appreciated. Thanks!
EDIT 2 (08/06/2019 12:15 [GMT +8])
Since nobody seems to have a clue about this, I just re-wrote my plug-in to use Galv's Event Spawner as the method for creating the events.
It's kind of a pain because the Galv's plug-in requires the use of a "Spawn Map" to draw events from, but at least it isn't giving me the TypeError any more.
Below is the less exciting, MapCrowd() revision.
Code:
function MapCrowd() {
if ($dataMap.meta.clone != undefined) {
let crowd = ($dataMap.meta.clone.replace(/\s/g, ``)).split(`;`);
for (let clones = 0; clones < crowd.length; clones++) {
let temporary = crowd[clones].split(`|`);
let regionId = Number(temporary[0]);
let clone_event = Number(temporary[1]);
PlaceEvent(clone_event, regionId);
}
}
};PlaceEvent() calls Galv.SPAWN.event to create the events.
Subsequently I also had to rewrite a few other things to get everything working again- Galv's plug-in uses a custom global $dataSpawnMap, which I needed to reference (instead of $dataMap) to read the [Note] field of the newly spawned events.
That's all folks!
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