event-handling

问题 Surprised, I am encountering this weird issue while submitting form from JS. Issue: Consider a simple form submitted using two ways from a submit button and an anchor link <form method="POST" action="page.html" name="foobar" id="test"> <input type="text" /> <input type="submit" /> </form> <a href="#" onclick="document.getElementById('test').submit();">click me</a> Function catching the submit event document.getElementById('test').onsubmit = function() { // Same result with // * document

问题 Surprised, I am encountering this weird issue while submitting form from JS. Issue: Consider a simple form submitted using two ways from a submit button and an anchor link <form method="POST" action="page.html" name="foobar" id="test"> <input type="text" /> <input type="submit" /> </form> <a href="#" onclick="document.getElementById('test').submit();">click me</a> Function catching the submit event document.getElementById('test').onsubmit = function() { // Same result with // * document

问题 Context In Vue 2.0 the documentation and others clearly indicate that communication from parent to child happens via props. Question How does a parent tell its child an event has happened via props? Should I just watch a prop called event? That doesn't feel right, nor do alternatives ( $emit / $on is for child to parent, and a hub model is for distant elements). Example I have a parent container and it needs to tell its child container that it's okay to engage certain actions on an API. I

问题 I am attempting to understand Boost.Asio, with the intention of potentially implementing a signaling system using condition variables in conjunction with Boost.Asio. I have seen the other StackOverflow questions boost asio asynchronously waiting on a condition variable, boost::asio async condition, and boost condition variable issue, but none of these questions/answers have satisfactorily touched on an essential question that I have: Is it true that, and/or is there a fundamental reason why,

问题 Code: $('#Inputfield').keyup(function(e) { if(e.which == 13) { functionXyz(); } else { functionZyx(); } }); $(document).keyup(function(exit) { if (exit.keyCode == 27) { functionZzy(); } }); Question: How to remove the keyup event handler of keyCode == 27 and keep the other $(document).keyup event handlers intact? 回答1: You have to use a named function so you can reference that specific handler when calling .unbind(), like this: function keyUpFunc(e) { if (e.keyCode == 27) { functionZzy(); } }

问题 I have an EditText field with a Customer Text Watcher on it. In a piece of code I need to change the value in the EditText which I do using .setText("whatever") . The problem is as soon as I make that change the afterTextChanged method gets called which created an infinite loop. How can I change the text without it triggering afterTextChanged? I need the text in the afterTextChanged method so don't suggest removing the TextWatcher . 回答1: You could unregister the watcher, and then re-register

问题 I have an EditText field with a Customer Text Watcher on it. In a piece of code I need to change the value in the EditText which I do using .setText("whatever") . The problem is as soon as I make that change the afterTextChanged method gets called which created an infinite loop. How can I change the text without it triggering afterTextChanged? I need the text in the afterTextChanged method so don't suggest removing the TextWatcher . 回答1: You could unregister the watcher, and then re-register

问题 I have an element with an onclick method. I would like to activate that method (or: fake a click on this element) within another function. Is this possible? 回答1: If you're using JQuery you can do: $('#elementid').click(); 回答2: Once you have selected an element you can call click() document.getElementById('link').click(); see: https://developer.mozilla.org/En/DOM/Element.click I don't remember if this works on IE, but it should. I don't have a windows machine nearby. 回答3: I could be

问题 I am bit confused what exactly $event doing here and what is the difference between this two examples <button (click)="clicked($event)"></button> @Component(...) class MyComponent { clicked(event) { event.preventDefault(); } } and <button (click)="clicked()">Click</button> @Component(...) class MyComponent { clicked(event) { } } 回答1: $event is the event itself. The event binding (someevent) allows to bind to DOM events and to EventEmitter events. The syntax is exactly the same. For DOM events

问题 I've got code similar to the following... <p><label>Do you have buffet facilities?</label> <asp:RadioButtonList ID="blnBuffetMealFacilities:chk" runat="server"> <asp:ListItem Text="Yes" Value="1"></asp:ListItem> <asp:ListItem Text="No" Value="0"></asp:ListItem> </asp:RadioButtonList></p> <div id="HasBuffet"> <p><label>What is the capacity for the buffet?</label> <asp:RadioButtonList ID="radBuffetCapacity" runat="server"> <asp:ListItem Text="Suitable for upto 30 guests" value="0 to 30"></asp