callback Archives - Page 3 of 3

What is a callback function?

What is a callback function? 22 s 22 Developers are often confused by what a callback is because of the name of the ...

April 22, 2022
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How do I convert an existing callback API to promises?

I want to work with promises but I have a callback API in a format like: 1. DOM load or other one time ...

April 20, 2022
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How can I pass a parameter to a setTimeout() callback?

I have some JavaScript code that looks like: function statechangedPostQuestion() { //alert("statechangedPostQuestion"); if (xmlhttp.readyState==4) { var topicId = xmlhttp.responseText; setTimeout("postinsql(topicId)",4000); } } function ...

April 17, 2022
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How to access the correct `this` inside a callback

I have a constructor function which registers an event handler: function MyConstructor(data, transport) { this.data = data; transport.on('data', function () { alert(this.data); }); ...

April 11, 2022
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