pavan kumar k pavan kumar k - 1 month ago 6x
jQuery Question

Jquery resize() api confusion

Following jquery code displaying two alert() boxes. why?



My question is why Jquery calling custom events(i.e event name starts with "resize") after resize() triggers?

jQuery version : 1.12.4


Your example code binds two event listeners for resize. The first one uses the resize() function and the second uses bind(), what is both basically the same. A third option would be to use on().

The only difference is that you gave the second listener a namespace called test, separated by a dot (.) between event name and namespace. But this is still a resize event listener, and not a custom event!

Namespaces helps you to seperate or group event listeners. For example, you can remove specific listeners:

$(window).on("resize", function() {
    console.log("- resize");

$(window).on("resize.test", function() {
    console.log("- resize.test");

// trigger resize
console.log("first trigger:");

// remove all listeners with '.test' namespace
$(window).off(".test"); // or more specific: $(window).off("resize.test");

// trigger resize again
console.log("second trigger:");
<script src=""></script>

Official event.namespace doc.