CODEWITHSUNDEEP
jqueryclickthis
wayfare
wayfare

Reputation: 709

How to pass $(this) properly in click jQuery function

I am trying to make a tictactoe project in jQuery and I am having a major problem...

The tiles are in <td> tags and I am trying to make it so that when the user clicks the the tile, it calls the "marked" function.

If we now look into the "marked" function, $(this) is intended to be the <td> node that the function was called from.

However, it wasn't doing anything so I checked the console and apparently $(this) was containing the DOM Window object.

Is there anyway I can send the right kind of $(this) to the "marked" function?

Thank you!

<script type="text/javascript">

    var TURN_X = false;
    var TURN_O = true;

    var turn = false;  // this is to see whos turn it is.

    $(document).ready(function(){

        var listCells = $.makeArray($("td"));
        $("td").click(function(){marked(listCells)});   //THIS IS WHERE I HAVE PROBLEMS
        return false;
    });

    function marked(arr)
    {
        console.log($(this));  // THIS CONSOLE LOG RETURNS "DOM Window"
        $(this).addClass("marked");

        if(turn == TURN_X)
        {
        this.innerHTML = "X";
        turn = false;
        }
        else
        this.innerHTML = "O";

        var tileNum = $(this).attr("id");
    }

Upvotes: 30

Views: 116587

Answers (8)

Daphoque
Daphoque

Reputation: 4678

More simply, use bind :

$(".detailsbox").click(function(evt){
   test.bind($(this))();
});
function test()
{
   var $this = $(this);
}

Upvotes: 4

Hadas
Hadas

Reputation: 10384

Send the element which fire the event to the function like that:

$("td").click(function(){
        marked($(this));
        return false;
    });

and in the function:

function marked(td)
{
     console.log($(td));  
     $(td).addClass("marked");
     //....
}

Upvotes: 16

Tomalak
Tomalak

Reputation: 338416

You code does not follow the right principles.

$(function(){
    var TURN_X = "X",
        TURN_O = "O", 
        turn   = TURN_O,
        $listCells = $("td");

    function marked() {        // define event handler
        var $this   = $(this),
            tileNum = $this.attr("id");

        if ( !($this.hasClass("marked") ) {
            $this.addClass("marked").text(turn);
            turn = (turn == TURN_X) ? TURN_O : TURN_X;
        }
    }

    $listCells.click(marked);  // attach event handler
});
  1. Wrap everything in the document.ready function. Avoid global variables wherever possible.
  2. Make use of the fact that jQuery manages this for you. this will always be what you expect if you pass callback functions directly instead of calling them yourself.

Upvotes: 32

adeneo
adeneo

Reputation: 318362

$(document).ready(function(){
    var TURN_X = false,
        TURN_O = true,
        turn = false,
        listCells = $.makeArray($("td"));

    $("td").click(function() {
        marked(listCells, this)
    });

    function marked(arr, self) {
        $(self).addClass("marked");

        if(turn == TURN_X) {
            self.innerHTML = "X";
            turn = false;
        }else{
            self.innerHTML = "O";
            var tileNum = self.id;
        }
    }
});

Upvotes: 0

francisco.preller
francisco.preller

Reputation: 6639

Try:

$("td").click(function(event){
    marked(listCells, $(this));
});

Then:

function marked(arr, sel) {
    console.log($(this));
    sel.addClass("marked");

    if(turn == TURN_X) {
        this.innerHTML = "X";
        turn = false;
    } else {
        this.innerHTML = "O";
    }
    var tileNum = $(this).attr("id");
}

Upvotes: 1

Sarfraz
Sarfraz

Reputation: 382909

You need to pass $(this) to your function:

$("td").click(function(){ marked(listCells, $(this))} );

And modify your function like this:

function marked(arr, that)
{
  that.addClass("marked");

  if(turn == TURN_X)
  {
    that.innerHTML = "X";
    turn = false;
  }
  else
    that.innerHTML = "O";

  var tileNum = that.attr("id");
}

Upvotes: 0

Guffa
Guffa

Reputation: 700910

You can use the call method to specify the scope for the function:

$("td").click(function(){ marked.call(this, listCells); });

Now the marked function can access the clicked element using the this keyword.

Upvotes: 0

quzary
quzary

Reputation: 285

try this:

$(function(){
    var listCells = $.makeArray($("td"));
    $("td").click(function(){marked($(this),listCells)});  
});



function marked(o,arr)
{
...

Upvotes: 0

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