javascript-events

问题 This question already has answers here : JavaScript event registering without using jQuery (6 answers) Closed 6 years ago . I would like to create a boolean function that can detect whether a certain element is being clicked and then output true or false. I want to do this in pure JavaScript with no jQuery, and my idea looks something like this: function clicked(whatever-element-I-want) { if(whatever-element-I-want==clicked) { return true; } else { return false; } } I know this question

问题 This question already has answers here : JavaScript event registering without using jQuery (6 answers) Closed 6 years ago . I would like to create a boolean function that can detect whether a certain element is being clicked and then output true or false. I want to do this in pure JavaScript with no jQuery, and my idea looks something like this: function clicked(whatever-element-I-want) { if(whatever-element-I-want==clicked) { return true; } else { return false; } } I know this question

问题 I am trying to add an animationend event to an element, but the event doesn't get fired. What am I doing wrong, and how can I fix it? JSFiddle var btn = document.getElementById('btn'); var elem = document.getElementById('elem'); var timeOutFunc; btn.addEventListener('click', function() { elem.classList.add('show'); clearTimeout(timeOutFunc); timeOutFunc = setTimeout(function() { elem.classList.remove('show') }, 1000); }); elem.addEventListener('animationend', function(e) { console.log(

问题 I am trying to style a checkbox list. I've added my styles and they appear correctly when rendered. I want to add a class when the label for the checkbox is clicked. This is my markup and here is the same in a jsfiddle. You can see from my fiddle that two click events are registered with just one click. Why? html: <ul> <li> <label for="test_0" class=""> <input id="test_0" name="offering_cycle" type="checkbox" value="1"> Fall </label> </li> <li> <label for="test_1" class=""> <input id="test_1"

问题 I am trying to style a checkbox list. I've added my styles and they appear correctly when rendered. I want to add a class when the label for the checkbox is clicked. This is my markup and here is the same in a jsfiddle. You can see from my fiddle that two click events are registered with just one click. Why? html: <ul> <li> <label for="test_0" class=""> <input id="test_0" name="offering_cycle" type="checkbox" value="1"> Fall </label> </li> <li> <label for="test_1" class=""> <input id="test_1"

问题 How can I append style element to DOM without eliminating existing style on the item (eg color, text-align, etc)? The event calls the function, but the problem is 'Style' gets completely replaced with the single item instead. I have simple code triggered on the event: function changeback(onoff) { if(onoff) { document.getElementById("field1").style.background="#fff"; } else document.getElementById("field1").style.background="#000"; } 回答1: Which browser are you using? In Chrome, this works for

问题 How can I append style element to DOM without eliminating existing style on the item (eg color, text-align, etc)? The event calls the function, but the problem is 'Style' gets completely replaced with the single item instead. I have simple code triggered on the event: function changeback(onoff) { if(onoff) { document.getElementById("field1").style.background="#fff"; } else document.getElementById("field1").style.background="#000"; } 回答1: Which browser are you using? In Chrome, this works for

问题 How can I append style element to DOM without eliminating existing style on the item (eg color, text-align, etc)? The event calls the function, but the problem is 'Style' gets completely replaced with the single item instead. I have simple code triggered on the event: function changeback(onoff) { if(onoff) { document.getElementById("field1").style.background="#fff"; } else document.getElementById("field1").style.background="#000"; } 回答1: Which browser are you using? In Chrome, this works for

问题 As you know, events usually bubble up in javascript, so the event handler of the element that fires the event is executed first, then the event handler of the parent element is called and so on. This behaviour causes some problems on a project I'm currently working on, I would rather have the execution order reversed. I figuered out a solution that is using timeouts: $(element).mouseover(function(){ var that = this; setTimeout(function() { //actual event handler, but references to "this" are

问题 As you know, events usually bubble up in javascript, so the event handler of the element that fires the event is executed first, then the event handler of the parent element is called and so on. This behaviour causes some problems on a project I'm currently working on, I would rather have the execution order reversed. I figuered out a solution that is using timeouts: $(element).mouseover(function(){ var that = this; setTimeout(function() { //actual event handler, but references to "this" are