Instead of putting your jQuery code inside of $(document).ready(), put it inside function pageLoad(sender, args) { … } pageLoad is executed after every postback, synchronous or asynchronous. pageLoad is a reserved function name in ASP.NET AJAX that is for this purpose. $(document).ready() on the other hand, is executed only once, when the DOM is initially … Read more
The reason it won’t catch anything in your example is because once the geocode() callback is called, the try/catch block is over. Therefore the geocode() callback is executed outside the scope of the try block and thus not catchable by it. As far as I know, it is not possible to catch exceptions thrown in … Read more
A callback is a function provided by the consumer of an API that the API can then turn around and invoke (calling you back). If I setup a Dr.’s appointment, I can give them my phone number, so they can call me the day before to confirm the appointment. A callback is like that, except … Read more
Like this… function doSomething(url, elem) { $.ajax({ type: “GET”, url: url, dataType: “xml”, success: function(xml) { rssToTarget(xml, elem); } }); } Answer to your comment: Does use of anonymous functions affect performance?
Well, setTimeout, per its definition, will not hold up the thread. This is desirable, because if it did, it’d freeze the entire UI for the time it was waiting. if you really need to use setTimeout, then you should be using callback functions: function myfunction() { longfunctionfirst(shortfunctionsecond); } function longfunctionfirst(callback) { setTimeout(function() { alert(‘first function … Read more
Since the settings object is tied to that ajax call, you can simply add in the indexer as a custom property, which you can then access using this in the success callback: //preloader for images on gallery pages window.onload = function() { var urls = [“./img/party/”,”./img/wedding/”,”./img/wedding/tree/”]; setTimeout(function() { for ( var i = 0; i … Read more
A common, if ugly, way of dealing with this situation is to use another function that is immediately invoked to create a scope to hold the variable. for(var i = 0; i < length; i++) { var variable = variables[i]; otherVariable.doSomething(function(v) { return function(err) { /* something with v */ }; }(variable)); } Notice that … Read more
Define an interface, and implement it in the class that will receive the callback. Have attention to the multi-threading in your case. Code example from http://cleancodedevelopment-qualityseal.blogspot.com.br/2012/10/understanding-callbacks-with-java.html interface CallBack { //declare an interface with the callback methods, //so you can use on more than one class and just //refer to the interface void methodToCallBack(); } class … Read more
You used a function call instead of a function reference as the first parameter of the setInterval. Do it like this: function timer() { console.log(“timer!”); } window.setInterval(timer, 1000); Or shorter (but when the function gets bigger also less readable): window.setInterval( function() { console.log(“timer!”); }, 1000)
A callback is procedure you pass as an argument to another procedure. The procedure receiving the parameter can call it, or share it so some other procedures in the system can call it. An event handler is a procedure called when an event happens. It can be a callback.