javascript-events | 易学教程

Why jQuery trigger or triggerHandler doesn't work?

阅读更多关于 Why jQuery trigger or triggerHandler doesn't work?

问题 Here is my code : <html> <head> <script src="//code.jquery.com/jquery-1.10.2.js"></script> <script type='text/javascript'> window.onload=function(){ var e = jQuery.Event( "click" ); e.preventDefault(); $("#rrx").triggerHandler(e); $("#rrx").trigger("click"); } </script> </head> <body> <a href="http://google.com" id="rrx" > gooooooog </a> </body> </html> After page load I should be redirected to http://google.com but this is not happening! 回答1: You need to call native click method on anchor

show tooltips of piechart when hover outside of the chart on a button

阅读更多关于 show tooltips of piechart when hover outside of the chart on a button

问题 http://jsfiddle.net/39UXK/4/ in this example I want to see the tooltips of the piechart when i hover on the respected buttons. Can anyone please help me here ? Cheers 回答1: You need to find the point in question, select it, and refresh the tooltip: // find the point var point = chart.series[0].points[i]; // select the point point.select(); // refresh the tooltip chart.tooltip.refresh(point); 来源： https://stackoverflow.com/questions/11671227/show-tooltips-of-piechart-when-hover-outside-of-the

What happens when you blur a DOM Element

阅读更多关于 What happens when you blur a DOM Element

问题 I am having a hard time finding any documention on what is "suppose" to happen whenever a DOM element is blured. My naive assumption was that the browser whould traverse up the DOM to find the next focusable element - but given the following jsfiddle, that is obviously not what happens. jsfiddle-example  <body> <div id="root" tabindex="0">root <div id="p1" tabindex="0">p1 <div id="p2" tabindex="0">p2 </div> </div> </div> </body> /* Javascript */ var

How to get the old value of a textarea

阅读更多关于 How to get the old value of a textarea

问题 That's it. How can I get the old value of a textarea in order to compare it with a new value?. The current value becomes the old value after triggering an event (say, a keyup event). I have seen some solutions, for example, using cookies to record the old value and the new value, however, such solution doesn't work in my case because of the type of manipulation I want to perform later. Hopefully, there is a suggestion which works better than that. Thanks in advance. UPDATE : After following

Obtain cookies of the page being visited

阅读更多关于 Obtain cookies of the page being visited

问题 I want to know how can we obtain the cookies of the current page being accessed using a communication link between the content script and background page. This is for an extension. 回答1: You can use Content Scripts to access document.cookie for each website you visit. Then you can use Message Passing to pass the cookies from your Content Script to your Background Page. There are many examples on Stack Overflow for example: Chrome Extension: how to capture selected text and send to a web

How to show and hide an element, pass values from javascript to html element using JavaScript (not jQuery)?

阅读更多关于 How to show and hide an element, pass values from javascript to html element using JavaScript (not jQuery)?

问题 I am total newbie to programming so this question of mine might seems irrelevant. I wanna know how to hide and show a html element using the original JavaScript not jQuery. Since Im a total beginer I think I have to learn the primitive JavaScript before jumping into some libraries like jQuery. First of all I'll paste the codes... index.php <html> <head> <script type="text/javascript" src="myscripts.js"></script> <style type='text/css'> #show_description { min-height: 100px; min-width: 500px;

KineticJS - Performance Difference Between Kinetic.Group.listening() and Individual Kinetic.Node.listening()

阅读更多关于 KineticJS - Performance Difference Between Kinetic.Group.listening() and Individual Kinetic.Node.listening()

问题 Is there any performance difference between this: var rect1 = new Kinetic.Rect({ listening: false }), rect2 = new Kinetic.Rect({ listening: false }), group = new Kinetic.Group; group.add( rect1 ); group.add( rect2 ); ... and this: var rect1 = new Kinetic.Rect, rect2 = new Kinetic.Rect, group = new Kinetic.Group({ listening: false }); group.add( rect1 ); group.add( rect2 ); If so, why? 来源： https://stackoverflow.com/questions/24592127/kineticjs-performance-difference-between-kinetic-group

Show an alert when mouse is on a div for 2 seconds

阅读更多关于 Show an alert when mouse is on a div for 2 seconds

问题 I have certain div in the page and I need to do this: When the user mouse stands on the div for 2 seconds without moving out, then an alert will show I came here because I don't really know where to start, what to do, how to make it. I searched on the web but I got no results. Any tutorial, resources, guide or example would be great. 回答1: When hovering over the element, use setTimeout to request an alert box, with a delay of 2000 milliseconds (2 seconds). Reset the timer using clearTimeout

Show an alert when mouse is on a div for 2 seconds

阅读更多关于 Show an alert when mouse is on a div for 2 seconds

Couch DB Join operations like RDBMS

阅读更多关于 Couch DB Join operations like RDBMS

问题 I am using one DB for storing plain documents and another DB for storing only attachments. But i am storing attachment id in plain documents DB. Is there any way how to perform join operations two databases like RDBMS. Thanks in Advance 回答1: I know that it's possible to do joins within a database: Here's a great post on that: http://www.cmlenz.net/archives/2007/10/couchdb-joins The crux of it is that couchdb can order json values, including lists. So let's take it from the top...CouchDB, as