This is what I am trying to do and it isn't working, Error it is showing is : this.run is not a function. on the line ( this.xId = window.setInterval( 'this.run()', 2500 ); )
function(){
this.run = function(){
DO SOMETHING;
}
this.xId = window.setInterval( 'this.run()', 2500 );
}
What could be the reason ?
You need to pass anonymously function for that:
this.xId = window.setInterval( function() { this.run() }, 2500 );
Or better is to bind this function with this context:
this.xId = window.setInterval( this.run.bind(this) , 2500 );
Note that bind are implemented in ECMA-262, 5th edition, so for crossbrowser compatibility you need to add this:
if (!Function.prototype.bind) {
Function.prototype.bind = function (oThis) {
if (typeof this !== "function") {
// closest thing possible to the ECMAScript 5 internal IsCallable function
throw new TypeError("Function.prototype.bind - what is trying to be bound is not callable");
}
var aArgs = Array.prototype.slice.call(arguments, 1),
fToBind = this,
fNOP = function () {},
fBound = function () {
return fToBind.apply(this instanceof fNOP
? this
: oThis || window,
aArgs.concat(Array.prototype.slice.call(arguments)));
};
fNOP.prototype = this.prototype;
fBound.prototype = new fNOP();
return fBound;
};
}
window.setInterval(this.run,2500 ) ?; If not pls explain the difference ?
js file that is included on top of all pages.First of all, use a function reference rather than a string for the timeout callback. the this when using a string is the global object, and not what might have provided it.
Secondly, cache the value of this. The this in the callback may not be the same as the one outside it (which is the one attached with run).
function(){
var that = this; //cache "this"
this.run = function(){
//DO SOMETHING;
}
this.xId = window.setInterval(function(){
that.run()
},2500);
}
this" you could use the bind function as described here: developer.mozilla.org/en/JavaScript/Reference/Global_Objects/…
"this.run()"is evaluated in global scope and there,thisrefers towindow. I assume you don't have a functionrunin global scope.