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问题 I have created an DOM element for an MDC slider (https://material.io/develop/web/components/sliders). It looks nice (except for the colors). And it works, but I really have no idea how to initialize it. I import MDC from the CDN. I can't understand from the documentation how to do the initialization. This is one version that works: setTimeout(() => { slider = new mdc.slider.MDCSlider(eltSlider) }); Without setTimeout it does not work. I have tried using a Promise instead and wait a second.

问题 My Goal is to rescale the image automatically to 12 x 12 whenever someone select the file from desktop. Eg: - If user select 1000 x 500 image i want it to automatically rescale to 12 x 12 HTML: <input type="file" name="files[]" class="myimage" /> (Using Javascript) 回答1: If you want the image to have a certain dimensions such as 12x12 as soon as it loads, you will need to add a class to the image by listening to the 'load' event of the image. Like this: The class will be applied as soon as the

问题 I'm having big trouble trying to create a while loop within a while loop. The first while loop is supposed to output categories. The second while loop is supposed to output the links associated with the category. The link information is in a links table and the categories information in the category table. I'm trying to do a JOIN on links.catID on category.ID. Links table: id links url catID type Category table: id cat type links.catID is supposed to equal category.id in ints. category.cat

问题 I'm having big trouble trying to create a while loop within a while loop. The first while loop is supposed to output categories. The second while loop is supposed to output the links associated with the category. The link information is in a links table and the categories information in the category table. I'm trying to do a JOIN on links.catID on category.ID. Links table: id links url catID type Category table: id cat type links.catID is supposed to equal category.id in ints. category.cat

问题 I'm having big trouble trying to create a while loop within a while loop. The first while loop is supposed to output categories. The second while loop is supposed to output the links associated with the category. The link information is in a links table and the categories information in the category table. I'm trying to do a JOIN on links.catID on category.ID. Links table: id links url catID type Category table: id cat type links.catID is supposed to equal category.id in ints. category.cat

问题 When implementing csp-header, I have specified my policy as: default-src 'self'; script-src www.gstatic.com; Since I have not declared script-src-elem directive in my csp policy, as stated in this mdn documentation, I was expecting policy defined for script-src to be used for script-src-elem directive as well. However, I see violation being reported as "viloated-directive":"script-src-elem" "blocked-uri":"https://www.gstatic.com/blah/blah" . Any idea why this behavior is happening? 回答1: After

问题 my socket.io version 1.3.5 I want to get number of clients in particular room. This is my code. socket.on('create or join', function (numClients, room) { socket.join(room); }); I use this code for get clients in room : console.log('Number of clients',io.sockets.clients(room)); 回答1: To get the number of clients in a room you can do the following: function NumClientsInRoom(namespace, room) { var clients = io.nsps[namespace].adapter.rooms[room]; return Object.keys(clients).length; } This

问题 my socket.io version 1.3.5 I want to get number of clients in particular room. This is my code. socket.on('create or join', function (numClients, room) { socket.join(room); }); I use this code for get clients in room : console.log('Number of clients',io.sockets.clients(room)); 回答1: To get the number of clients in a room you can do the following: function NumClientsInRoom(namespace, room) { var clients = io.nsps[namespace].adapter.rooms[room]; return Object.keys(clients).length; } This

问题 my socket.io version 1.3.5 I want to get number of clients in particular room. This is my code. socket.on('create or join', function (numClients, room) { socket.join(room); }); I use this code for get clients in room : console.log('Number of clients',io.sockets.clients(room)); 回答1: To get the number of clients in a room you can do the following: function NumClientsInRoom(namespace, room) { var clients = io.nsps[namespace].adapter.rooms[room]; return Object.keys(clients).length; } This

问题 Hi I was trying phone links inside iframe in iOS9. Phone application doesn't open up in safari in iOS9. When i tried same link inside then it is working there. I was trying below anchor tag. This code opens up phone application when put inside div. But same code doesn't work inside iframe. Please suggest how does it make to work inside iframes as well? Please use below code to see phone link outside iframe <a href = "tel://1-408-555-5555">1-408-555-5555</a> Please use below code to verify