selector

Javascript get element index position in DOM array by class or id

由 折月煮酒 提交于 2019-12-13 02:23:40
问题 My situation var domElements = document.body.getElementsByTagName('*'); Now I want to return the array item key - position of the element in the array - ( for example domElements[34] ) searching in the array for the element with id="asd" . How can I achieve this? What if instead of ID I want to search trough class="asd hey" ? Any help appreciated, thank you! NB: Not in jquery, I need it in pure javascript in this case 回答1: Try like this var matches = document.querySelectorAll("#asd"); If you

Question about Objective-C selectors; Can I use parameters and how?

由 丶灬走出姿态 提交于 2019-12-13 01:54:17
问题 I'm attempting to use a selector with arguments and failing while doing so. I'm coming from C/++ and selectors are a tad bit confusing. I have this code: playItem = [CCMenuItemLabel itemWithLabel:playLabel target:self selector:@selector(goToScene:)argumentHere]; How would I go about passing an argument to a method in this way? Thanks in advance:D 回答1: You can't. Selectors specify only method to be invoked, not parameters to be passed. What you can do, is to check sender parameter in your

Accessing a div inside of a Polymer element template

由 送分小仙女□ 提交于 2019-12-12 23:07:35
问题 I'm trying to use core-animation on a div, to animate its position. To do that, i have to select it with document.getElementById(). The problem is, i have a rather complex structure in my index.html file and i can't find a way to select that div. Here's index.html structure (i need to select #el): http://i.imgur.com/phWyArO.jpg My index.html file: <template is="auto-binding" id="t"> <!-- Route controller. --> <flatiron-director route="{{route}}" autoHash></flatiron-director> <!-- Keyboard nav

Jsoup代码解读之七-实现一个CSS Selector

由 情到浓时终转凉″ 提交于 2019-12-12 21:02:31
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 当当当！终于来到了Jsoup的特色：CSS Selector部分。selector也是我写的爬虫框架 webmagic 开发的一个重点。附上一张street fighter的图，希望以后webmagic也能挑战Jsoup! select机制 Jsoup的select包里，类结构如下： 在最开始介绍Jsoup的时候，就已经说过 NodeVisitor 和 Selector 了。 Selector 是select部分的对外facade，而 NodeVisitor 则是遍历树的底层API，CSS Selector也是根据 NodeVisitor 实现的遍历。 Jsoup的select核心是 Evaluator 。Selector所传递的表达式，会经过 QueryParser ，最终编译成一个 Evaluator 。 Evaluator 是一个抽象类，它只有一个方法： <!-- lang: java --> public abstract boolean matches(Element root, Element element); 注意这里传入了root，是为了某些情况下对树进行遍历时用的。 Evaluator的设计简洁明了，所有的Selector表达式单词都会编译到对应的Evaluator。例如 #xx 对应 Id

XCode: Unrecognized selector sent to instance

由 天涯浪子 提交于 2019-12-12 20:45:47
问题 I am getting the following error: "-[Order items]: unrecognized selector sent to instance 0x6b5f240" I do have a class called Order, which looks like this: Order.h #import <Foundation/Foundation.h> #import <CoreData/CoreData.h> @class OrderItem; @interface Order : NSManagedObject { @private } @property (nonatomic, retain) NSNumber * orderID; @property (nonatomic, retain) NSDate * date; @property (nonatomic, retain) NSNumber * orderCode; @property (nonatomic, retain) NSSet* items; @end Order.m

Cocoa Selector Question

由 别来无恙 提交于 2019-12-12 16:20:07
问题 I have a question on how to use a selector with multiple parameters. I need to toggle this: -(void)openBackupNamed:(NSString *)name using this: [backupList addItemWithTitle:file action:@selector(openBackupNamed:) keyEquivalent:@""]; I know that there is the withObject: parameter for these cases, but I can't do this in the addItemWithTitle:action:keyEquivalent: method or am I missing something? Thanks 回答1: In your case you will have to create a new NSInvocation object and set it's index 2

How can I speed up jquery :selected selector?

由 匆匆过客 提交于 2019-12-12 16:02:39
问题 I have a dropdown in a web page with 3830 elements in it. I know, excessive but whatever. In jquery I get the selected option value using the statement: $( "#institutionCombo :selected" ).val(); There is a noticeable pause before the selection is found. Once I get that value I insert it into a textbox on the page, so I know how fast. Plus I've checked it using breakpoints in Firebug. If I go old school and use this javascript: var div = document.getElementById( "maindiv" ); var select = div

Get tapped cell in UITapGestureRecognizer handler

由 微笑、不失礼 提交于 2019-12-12 15:58:26
问题 I have set up a gesture recognizer for my table cell in my IOS5 app: UITapGestureRecognizer* oneFingerDoubleTap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(cellOneFingerDoubleTap:)]; oneFingerDoubleTap.numberOfTapsRequired = 2; [cell addGestureRecognizer:oneFingerDoubleTap]; And implemented handler method: - (void)cellOneFingerDoubleTap:(id) sender { NSLog(@"taptap"); } It works fine. My problem is that I can not pass the cell was tapped or some other data with the

Selector with argument

由 邮差的信 提交于 2019-12-12 14:52:38
问题 I have a method like this: - (void)methodWithParameter:(id)parameter { } and I want to call it using an UIBarButtonItem barButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(methodWithParameter:)]; I want to specify the parameter but I can't use withObject: after action: because I get a warning: No -initWithBarButtonSystemItem:target:action:withObject: method found can anybody help me with this? 回答1: It doesn't work that

jQuery selector to find the first child in each of a set of elements

由 为君一笑 提交于 2019-12-12 13:33:30
问题 I have this HTML: <div id="tags"> <ul> <li><input type="text" /><a href="#">First Link</a> <a href="#">Second Link</a></li> <li><input type="text" /><a href="#">First Link</a> <a href="#">Second Link</a></li> <li><input type="text" /><a href="#">First Link</a> <a href="#">Second Link</a></li> <li><input type="text" /><a href="#">First Link</a> <a href="#">Second Link</a></li> <li><input type="text" /><a href="#">First Link</a> <a href="#">Second Link</a></li> </ul> </div> What selector would
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