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I've been trying to make the game Battleship in JavaScript for a school assignment, and I'm stuck trying to create the opponent AI. I've created an event for when I click a cell in the grids:

function addListener(evt) {
    evt.addEventListener('click', function(){
        //bunch of code
    });
}

Now I run this function addListener every time I create a new cell in the grid in my nested for loop:

yourCell.setAttribute('id', evt + String(a) + String(b));
addListener(yourCell);

What I want now is for the opponent to run this click event when I've made my turn, so I wrote this just to test out the fireEvent function:

function enemyTurn() {
    document.getElementById('yourGrid00').fireEvent('onclick');
}

According to the second code example, I set the ID of the cell to 'yourGrid00', which I've confirmed by inspecting the html code after the JavaScript code has been run, and the function enemyTurn() will never run before each cell has been created and assigned an ID.

What I do not understand is that I get the following error on the fireEvent line:

Uncaught TypeError: undefined is not a function.

Does anyone know what I'm doing wrong?

I've been trying to make the game Battleship in JavaScript for a school assignment, and I'm stuck trying to create the opponent AI. I've created an event for when I click a cell in the grids:

function addListener(evt) {
    evt.addEventListener('click', function(){
        //bunch of code
    });
}

Now I run this function addListener every time I create a new cell in the grid in my nested for loop:

yourCell.setAttribute('id', evt + String(a) + String(b));
addListener(yourCell);

What I want now is for the opponent to run this click event when I've made my turn, so I wrote this just to test out the fireEvent function:

function enemyTurn() {
    document.getElementById('yourGrid00').fireEvent('onclick');
}

According to the second code example, I set the ID of the cell to 'yourGrid00', which I've confirmed by inspecting the html code after the JavaScript code has been run, and the function enemyTurn() will never run before each cell has been created and assigned an ID.

What I do not understand is that I get the following error on the fireEvent line:

Uncaught TypeError: undefined is not a function.

Does anyone know what I'm doing wrong?

• javascript
• html
• css

Share Improve this question Follow edited Oct 13, 2014 at 8:59 James Donnelly 129k3535 gold badges214214 silver badges223223 bronze badges asked Oct 13, 2014 at 8:43 Torstein RøsokTorstein Røsok 9311 gold badge11 silver badge66 bronze badges

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1 Answer 1

Sorted by: Reset to default 4

fireEvent is a really old method which is only supported on Internet Explorer versions 8 and lower. You should instead use dispatchEvent if you want to handle up-to-date browsers.

Dispatches an Event at the specified EventTarget, invoking the affected EventListeners in the appropriate order. The normal event processing rules (including the capturing and optional bubbling phase) apply to events dispatched manually with dispatchEvent().

You have to create the Event manually though - you can't just call dispatchEvent('onclick'). I've pulled the first bit of the following code from this answer.

var evt = document.createEvent("MouseEvents");
evt.initMouseEvent("click", true, true, window, 1, 0, 0, 0, 0,
    false, false, false, false, 0, null);

function enemyTurn() {
    document.getElementById('yourGrid00').dispatchEvent(evt);
}

JSFiddle demo.

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