frontend

问题 Chrome 65 removed support for the download attribute on anchor elements with cross-origin href s : Block cross-origin <a download> To avoid what is essentially a user-mediated cross-origin information leakage, Blink will now ignore the presence of the download attribute on anchor elements with cross origin attributes. Note that this applies to HTMLAnchorElement.download as well as to the element itself. Intent to Remove | Chromestatus Tracker | Chromium Bug This breaks serverless downloads

问题 I\'m working on a GUI front end in Python 2.6 and usually it\'s fairly simple: you use subprocess.call() or subprocess.Popen() to issue the command and wait for it to finish or react to an error. What do you do if you have a program that stops and waits for user interaction? For example, the program might stop and ask the user for an ID and password or how to handle an error? c:\\> parrot Military Macaw - OK Sun Conure - OK African Grey - OK Norwegian Blue - Customer complaint! (r) he\'s

问题 I have a simple form in my render function, like so: render : function() { return ( <form> <input type=\"text\" name=\"email\" placeholder=\"Email\" /> <input type=\"password\" name=\"password\" placeholder=\"Password\" /> <button type=\"button\" onClick={this.handleLogin}>Login</button> </form> ); }, handleLogin: function() { //How to access email and password here ? } What should I write in my handleLogin: function() { ... } to access Email and Password fields? 回答1: Use the change events on

问题 Is there any way to implement a callback function in case of css3 animation? In case of Javascript animation its possible but not finding any way to do it in css3. One way I could see is to execute callback after the animation duration but that doesn\'t make sure that it will always be called right after the animation ends. It will depend on the browser UI queue. I want a more robust method. Any clue? 回答1: Yes, there is. The callback is an event, so you must add an event listener to catch it.

问题 I am building something with React where I need to insert HTML with React Variables in JSX. Is there a way to have a variable like so: var thisIsMyCopy = \'<p>copy copy copy <strong>strong copy</strong></p>\'; and to insert it into react like so, and have it work? render: function() { return ( <div className=\"content\">{thisIsMyCopy}</div> ); } and have it insert the HTML as expected? I haven\'t seen or heard anything about a react function that could do this inline, or a method of parsing

问题 I\'m making a very basic React app from teamtreehouse.com, and I\'m constantly encountering \"TypeError: Cannot read property \'onPlayerScoreChange\' of undefined\" even though I\'m binding my functions correctly (I think) \'onPlayerScoreChange\' Is a method in the Grandparent component which executes when a user hits a \'+\' or \'-\' button to change a player\'s score. It would be really helpful if someone could explain what is wrong, because I think I am setting this.onPlayerScoreChange =

问题 I would like to know when I should include external scripts or write them inline with the html code, in terms of performance and ease of maintenance. What is the general practice for this? Real-world-scenario - I have several html pages that need client-side form validation. For this I use a jQuery plugin that I include on all these pages. But the question is, do I: write the bits of code that configure this script inline? include all bits in one file that\'s share among all these html pages?