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The jQuery event for user pressing enter is keyup and keyCode. You can try to run the following code to trigger an event on pressing enter key in textbox,ExampleLive Demo $(document).ready(function(){ $('input').bind("enterKey",function(e){ alert("Enter key pressed"); }); $('input').keyup(function(e){ if(e.keyCode == 13) { $(this).trigger("enterKey"); } }); }); Press Enter key in the above input text.
jQuery also provides a set of event helper method which can be used either to trigger an event to bind any event types mentioned above.Trigger MethodsThe following is an example which would triggers the blur event on all paragraphs −$("p").blur();Binding MethodsThe following is an example which would bind a click event on all the −$("div").click( function () { // do something here });Here are some of the jQuery Event Helper methods:S. NoMethod & Description1.blur()Triggers the blur event of each matched element.2.blur( fn )Bind a function to the blur event of each matched element.3.click( )Triggers the click event of ... Read More
The jQuery event handlers always execute in the order they were bound. With jQuery, you can also change the sequence. Let’s see how, for example, fromdemo(1); demo(2);We can change the sequence to −demo(2); demo(1);ExampleYou can try to run the following to learn and change the sequence of jQuery events −Live Demo $(document).ready(function(){ $.fn.bindFirst = function(name, fn) { this.on(name, fn); this.each(function() { var handlers = $._data(this, 'events')[name.split('.')[0]]; var handler = handlers.pop(); ... Read More
Use the jQuery on() method to bind jQuery events on elements generated through other events. You can try to run the following code to learn how to use on() method to bind jQuery events:ExampleLive Demo $(document).ready(function(){ $(document).on({ mouseenter: function (e) { alert('mouse enter'); }, mouseleave: function (e) { alert('mouse leave'); } }, '.demo'); }); Heading 1 Demo One Demo Two Mouse enter and leave will generate alert boxes.
To suppress jQuery event handling temporarily, add a class to your element so that you can prevent further code from execution.ExampleYou can try to run the following code to learn how to suppress jQuery event handling −Live Demo $(document).ready(function(){ $(element).click(function(e) { e.preventDefault(); // Check for fired class if ($(this).hasClass('fired') == false) { // Add fired class $(element).addClass('fired'); // Remove fired class $(element).removeClass('fired'); } }); }); .fired { font-size: 25px; color: green; } This is a heading This is a paragraph. This is second paragraph.
Use the off() method to override jQuery event handlers. This method is used to remove an event handler. The on() method is used to attach one or more event handler.ExampleYou can try to run the following code to learn how to override jQuery event handlers −Live Demo jQuery off() method $(document).ready(function() { function aClick() { $("div").show().fadeOut("slow"); } $("#bind").click(function () { $("#theone").on("click", aClick).text("Can Click!"); }); $("#unbind").click(function () { $("#theone").off("click", aClick).text("Does nothing..."); }); }); button { margin:5px; } button#theone { color:red; background:yellow; } Does nothing... Bind Click Unbind Click Click!
Custom event means you can create your own events in jQuery. For example, create a custom event to fire an alert box on pressing any key on the keyboard.ExampleYou can try to run the following code to learn how to create a custom event,Live Demo $(document).ready(function(){ $('textarea').bind("enterKey",function(e){ alert("You have pressed Enter key!"); }); $('textarea').keyup(function(e){ if(e.keyCode == 13) { $(this).trigger("enterKey"); } }); });
Ti check whether jQuery events are blocking, use the .triggerHandler() method, since it returns anything the last event handler for that event on that selector returns.ExampleLive Demo $(document).ready(function(){ var myValue = "John"; $("body").bind("eventName", function(e, value) { return value + " Jacob"; }); var result = $("body").triggerHandler("eventName", myValue); alert(result); }); This shows an alert box.
To bind events on dynamically created elements, you need to load dynamically. You can try to run the following code to learn how to bind events on dynamically created elements. Here, we will generate a new list item on button click.ExampleLive Demo $(document).ready(function(){ $("button").click(function(){ $("ul").append("new item ×"); }); $(document).on("click", "a.del" , function() { $(this).parent().remove(); }); }); Add Click the above button to dynamically add new list items. You can remove it later. item
Let’s say an event handler is attached to your element. For example,$('#foo').click(function() { console.log('clicked!') });Then you can debug it like this:For jQuery 1.3.xvar cEvent = $('#foo').data("events").click; jQuery.each(cEvent, function(key, value) { console.log(value) }) For jQuery 1.4.xvar cEvent = $('#foo').data("events").click; jQuery.each(cEvent, function(key, handlerObj) { console.log(handlerObj.handler) }) For jQuery 1.8.x+var cEvents = $._data($('#foo')[0], "events").click; jQuery.each(cEvents, function(key, handlerObj) { console.log(handlerObj.handler) })