Question

I’m writing a jQuery plugin and I’m trying to set up a callback that takes a few parameters. How does jQuery determine which parameters are to be sent to a callback function?

In the plugin:

if (callback) {
    callback.call(var1, var2, var3);
}

The written callback:

$("#div").myplugin({callback: myfunction});
myfunction(biz,bar,bim) {
    alert("I love " + biz + " and " + bar + " and " + bim);
}

biz is set to var2, bar is set to var3, and bim is undefined.

Answer 1

The first argument of the call function is special:

fun.call(thisArg[, arg1[, arg2[, ...]]])

where thisArg is

The value of this provided for the call to fun.

https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/call

So, it would work if you passed a value for thisArg:

callback.call(this, var1, var2, var3);

Or, more simply, don’t use call at all if you don’t need this in the callback:

callback(var1, var2, var3);