onkeypress

问题 How can I make the onKeyPress event work in ReactJS? It should alert when enter (keyCode=13) is pressed. var Test = React.createClass({ add: function(event){ if(event.keyCode == 13){ alert('Adding....'); } }, render: function(){ return( <div> <input type="text" id="one" onKeyPress={this.add} /> </div> ); } }); React.render(<Test />, document.body); 回答1: I am working with React 0.14.7, use onKeyPress and event.key works well. handleKeyPress = (event) => { if(event.key === 'Enter'){ console.log

问题 I'm trying to create a functioning search box that highlights words in a text. However, I cannot make it do the search by pressing Enter. Do you have any suggestions where is the flaw in the code? Thanks! HTML: <form> <input type="text" id="search" onkeypress="if (e.keycode==13) doSearch(document.getElementById('search').value)" placeholder="What are you looking for?"> </form> JavaScript: function doSearch(text) { if (window.find && window.getSelection) { document.designMode = "on"; var sel =

问题 I'm new around here and i have a little problems with a C# application. I want to capture the key down event. This wasn't a problem at first but after i added some buttons to the form, the key down event of the form ignores the arrow keys and moves the focus from one button to the next.(The key up event works) Is there a way to stop this and make them do something else when i hold the arrow keys? 回答1: Set the KeyPreview property on the Form to true. That will allow the form to see the keydown

问题 I'm a noob at Javascript, but I'm trying to implement something on my website where users can type a quantity, and the subtotal updates dynamically as they type. For example: if items are 10 dollars each, and a user types 5 in the text field I would like it to show $50 next to the text box. Pretty simple multiplication, but I don't know how to do it with Javascript. I think onKeyPress somehow? Thanks! 回答1: Assuming the following HTML: <input type="text" id="numberField"/> <span id="result"><

问题 I'm trying to have a KeyEvent handler on a TableRow of TableView, but the handler doesn't get called. I'm aware that a handler can be registered on the TableView and use the selectionmodel/ focus model to get the slected or focussed item but i want to register a key event on row for a specific use case. The documentation of onKeyPressed event says, Defines a function to be called when this Node or its child Node has input focus and a key has been pressed. The function is called only if the

问题 With <input type="text" onKeyPress="alert(this.value)"> the alert box displays the value in the box, not included the current key depressed. However, this does not exhibit the same behavior, and I don't know why. <input type="text" onKeyPress="handleInput(this.value)"> function handleInput(value){ alert(value); } Added This http://jsfiddle.net/abalter/adbbb599/6/ 回答1: First thing is avoid using js code inside html tags it is a bad practice , you can use the keyup event to get the content of

问题 I have this preloadimages function: <script type="text/javascript"> function preloadimages(arr){ var newimages=[], loadedimages=0 var postaction=function(){} var arr=(typeof arr!="object")? [arr] : arr function imageloadpost(){ loadedimages++ if (loadedimages==arr.length){ postaction(newimages) } } for (var i=0; i<arr.length; i++){ newimages[i]=new Image() newimages[i].src=arr[i] newimages[i].onload=function(){ imageloadpost() } newimages[i].onerror=function(){ imageloadpost() } } return { /

问题 I created a search field (id:searchField) and a search button (id:searchButton) using Xpages Custom Controls. I added an onkeypress event on the search field such that it will trigger a click to the searchButton. The searchButton will then reload the page but with url parameters coming from the search field. The problem is that the page reloads but the search parameters are not added to the URL when I press ENTER in the search field , but works properly when I press searchButton. Here are the

问题 function h(x) { alert(x); } <input onkeypress=h(this.value) type=text> when i press 'a' alert empty when i press 'b' after 'a' =>ab alert only 'a' and i want 'ab' when i type 'abcd' it alert 'abc' only and i want 'abcd' 回答1: your event fires before letter is registered. you should use onkeyup event . It kicks-in after you release key 回答2: Javascript: function h(x) { alert(x); } HTML Code: <input onkeyup=h(this.value) type=text> 回答3: var unicode=e.keyCode? e.keyCode : e.charCode; typing =

问题 I use this script to search in a static page But i want this to search when i type in the text input and not when i click the button, i searchd and i found that any of this would work: onkeypress="this.submit();" onkeyup="this.submit();" onkeypress="document.forms["f1"].submit();" onkeyup="document.forms["f1"].submit();" but none of them works i used the same html with the script's <form id="f1" name="f1" action="javascript:void()" onsubmit="if(this.t1.value!=null && this.t1.value!='')parent