selector

问题 I was wondering if it were possible to, instead of selecting an element from the DOM via a jQuery selector, if I can create one instead. For example: $.create('#hello').insertAfter('#test'); would generate the following: <div id="test">This element already existed in the DOM.</div> <div id="hello"></div> Or, better yet, for more complex operations: $.create('#test.a.b'); for: <div id="test" class="a b"></div> Obviously, more complex operations like :selected or :nth-child or :not() and all of

问题 Here is what I used previously, var barButtonItem = UIBarButtonItem(image: backImgs, style: UIBarButtonItemStyle.plain, target: self, action: Selector("menuButtonTapped:")) But there is some syntax changes for Swift 3. 回答1: ex:- navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Add", style: .plain, target: self, action: #selector(addTapped)) 回答2: Summarize the mostly used method in Swift 3 for adding action to a barButton. Barbutton with text navigationItem.rightBarButtonItem =

问题 I have a problem of using selector that it does not work as what I expect. I wanna click on it then it gives me reaction and I select it(By long click but I probably do it through programmatic way) then it gives me another reaction. However, it reacts nothing in result.... reaction part: <TableRow android:layout_width="match_parent" android:layout_height="wrap_content" android:weightSum="10" android:padding="5dp" android:background="@drawable/border_bottom" > <LinearLayout android:layout

问题 This code snippet works to remove an existing class, before adding a new one, when I specify it directly (ie, 'ratingBlock', 'ratingBlock1', 'ratingBlock2', etc.). But when I use a wildcard selector in the removeClass ('[class^="ratingBlock"]'), it doesn't work. Am I doing something wrong? Thanks. <style type="text/css"> .ratingBlock {background:gold !important;} .ratingBlock1, .ratingBlock2, .ratingBlock3, .ratingBlock4, .ratingBlock5 {background:LightGreen;} </style> <div class="test block

问题 I wish to write a macro, to be used within any method, which references the method's selector. I do not wish to pass the literal name of the method. For example: #define RERUN [self performSelector:{something} withObject:nil afterDelay: 0.0] where the "{something}" in the above would resolve to the selector of whatever method the macro was used in. Is there some way to do this? 回答1: _cmd represents the selector of the current method -- it is a hidden argument (like self ). if you never need

问题 I'm adding a button to a UITableViewCell programmatically. The method to be run when the button is pressed is - (void) quantityDown:(id)sender rowNumber:(int)rowNum , where rowNum is the row that the button appears in. When adding the target to the button, Xcode autocompletes the following: [buttonDown addTarget:self action:@selector(quantityDown:rowNumber:) forControlEvents:UIControlEventTouchUpInside]; But no matter what I try, I cannot pass the row number into the method. I assumed the

问题 I'm adding a button to a UITableViewCell programmatically. The method to be run when the button is pressed is - (void) quantityDown:(id)sender rowNumber:(int)rowNum , where rowNum is the row that the button appears in. When adding the target to the button, Xcode autocompletes the following: [buttonDown addTarget:self action:@selector(quantityDown:rowNumber:) forControlEvents:UIControlEventTouchUpInside]; But no matter what I try, I cannot pass the row number into the method. I assumed the

问题 I have two labels, Label1 and Label2. I want to make a single function that prints out which label is tapped by creating UITTapRecognizer for both labels calling the same function with selector that passes an argument. Below is the long way of doing it which is messy but works. If I know how to pass an argument (Int) into the selector, it would be alot cleaner. let topCommentLbl1Tap = UITapGestureRecognizer(target: self, action: #selector(DiscoverCell().doubleTapTopComment1))

问题 I want to use a selector on an NSObject instance without the need for an implemented protocol. For example, there's a category method that should set an error property if the NSObject instance it's called on supports it. This is the code, and the code works as intended: if ([self respondsToSelector:@selector(setError:)]) { [self performSelector:@selector(setError:) withObject:[NSError errorWithDomain:@"SomeDomain" code:1 userInfo:nil]]; } However, the compiler doesn't see any method around

问题 hey guys, i wanna create the simplest bookmarklet for my browser. javascript:document.getElementsByClassName('source').style.visibility='visible'; I have multiple div.source in my body. By default they are set to .source { display:none; } with css. My console tells me: Uncaught TypeError: Cannot set property 'display' of undefined When I click the bookmarklet all .source divs should be visible. What am I doing wrong here? 回答1: You might need to loop through the results, like this: var divs =