state

问题 I want to load a different image(fake avatar) while the final avatar image is loading. The idea is to detect when the prop image is loaded and change a state. Is it possible? Some ideas? Thank you! class ImageUser extends React.Component { constructor(props) { super(props); this.state = {userImageLoaded: false}; let imageSrc = ""; if (!this.props.userImage) { imageSrc = this.props.noUserImage; } else { imageSrc = this.props.userImage; } this.loadingImage = <img className={styles.imageUser}

问题 I'm trying to implement state restoration in an app that uses iOS 6+ and storyboards, but I am having problems finding a way to prevent duplicate calls to heavy methods. If I simply start the app, then I need to setup the UI in viewDidLoad : - (void)viewDidLoad { [super viewDidLoad]; [self setupUI]; } This works fine in a normal, non-state-restoration world. Now I've added state restoration and after restoring some properties I need to update the UI with those properties: - (void

问题 I have a form consisting of checkboxes which is filtering records on an index page, how can I make the checkboxes in the form keep their checked state once the form is submitted and the page is reloaded? I'm already using jQuery-UI to make the checkboxes look better. Im super new to any kind of programming and having less luck with javascript. index.html.erb <script> $(function() { $(".areas").buttonset(); }); $(function() { $( "button, input:submit, a", ".filter_form_button" ).button(); $(

问题 I'm using opencart 1.5.5.1 with a theme (sancart) and I'm getting a very annoying bug. In the modules checkout/cart and account/register the dropdown menu for Region/State field won't load the relative values (i guess are called zone or zone_id) and remains empty, blank. The same function instead works well in the module checkout/checkout proceeding both as Guest or user registration. Googleing around I've notice that is a pretty common bug with many themes, above all for those using SSH

问题 This question already has answers here : Change component state on button click (4 answers) Closed last year . This is my Root Component, it passes an array of url details in initial state to tab_list which renders individual tab_item for each url. I am also passing a function to delete the url , but when I do that and make changes to state , the state is not affected by it. : import React, { Component, PropTypes } from 'react'; import { Provider } from 'react-redux'; import TabList from '.

问题 I have a list of items that have checkboxes associated with them, and the items are beneath a list header, which also has a checkbox(for db purposes only) which is actually hidden from view. I need to make it so that if any of the checkboxes beneath the header is checked, then the header checkbox is checked as well. BUT I also need to make it so that if all of the checkboxes are unchecked, then the header one is unchecked...how hard is this going to be? This is how I have it setup now: if($('

问题 In the context of the design pattern state . What are the pros and cons of embedding the StateContext as additional method argument in State ? To make it clearer: public void handle(Object obj); vs. public void handle(StateContext context, Object obj); Refactoring the context into the parameter list, instead of keeping it as class member, would increase low coupling and enhance the reuse capabilities of the object. At the same time, having the context as member would reduce the size of the

问题 I am working on an App for collecting Customer Details like personal, business, assets etc. The app shows a ListView with options and based on options Activities are started. After entering details in personal user presses back button and returns to MainActivity ( Activity with a ListView ) and selects another option like business details and assets detail. User enters the details and come back to MainActivity by Back button and selects another option. I tried to save my Activity s using

问题 I'm having issues with setting this.setState from within my API call. If I console.log the stocks array inside the axios call the data is available in the array. It is not available outside if it. Is the problem because this.setState is merging objects? I'm having a hard time conceptualizing what is happening here. How do I fix this problem so I can pass the contents to props? import React, { Component } from 'react'; import axios from 'axios'; import SearchBar from './components/search_bar';

问题 A few months ago I've be created the topic: Try to render two templates in same View (Ui-Router), where I asked about how to render multiple views in the same page. My objective with this was created a web app as an desktop one, with views to minimize, maximize, close and stuff like that. Well, my app is ready but I'm getting a problem, when I up my app to the production some computers are taking a long time to render all the Views. In the image bellow we can se a lot of requisitions that