If the state doesn’t need to be shared with other components, or the state doesn’t need to be keep when the component is unmounted, then you can just put it in the component’s state. You can think that the Redux store is the database of front-end, if you have something like product data fetched from … Read more
The point is, do not redirect if not needed === if already redirected to intended state. There is a working plunker with similar solution .run(function($rootScope, $location, $state, authenticationSvc) { $rootScope.$on( ‘$stateChangeStart’, function(e, toState , toParams , fromState, fromParams) { var isLogin = toState.name === “login”; if(isLogin){ return; // no need to redirect } // now, … Read more
From this reference: If extraction fails (e.g. if a letter was entered where a digit is expected), value is left unmodified and failbit is set (until C++11) If extraction fails, zero is written to value and failbit is set. If extraction results in the value too large or too small to fit in value, std::numeric_limits::max() … Read more
Move all of your state and your handleClick function from Header to your MainWrapper component. Then pass values as props to all components that need to share this functionality. class MainWrapper extends React.Component { constructor() { super(); this.state = { sidbarPushCollapsed: false, profileCollapsed: false }; this.handleClick = this.handleClick.bind(this); } handleClick() { this.setState({ sidbarPushCollapsed: !this.state.sidbarPushCollapsed, profileCollapsed: … Read more
State and its relative ST both produce `monolithic’ stateful computations which may be run as units. They basically treat the mutable state as intermediate data, which is needed to produce a result, but should not, in and of itself, be of interest to the rest of the programme. On the other hand, what one puts … Read more
You need to use the negative value of the needed state. E.g.: states.addState(new int[] {-android.R.attr.state_enabled},R.drawable.btn_disabled); Notice the “-” sign before android.R.attr.state_enabled.
The answer is functional reactive programming (FRP). It it a hybrid of two coding styles: component state management and time-dependent values. Since FRP is actually a whole family of design patterns, I want to be more specific: I recommend Netwire. The underlying idea is very simple: You write many small, self-contained components each with their … Read more
To set your mind at ease, the onClick event does work with divs in react, so double-check your code syntax. These are right: <div onClick={doThis}> <div onClick={() => doThis()}> These are wrong: <div onClick={doThis()}> <div onClick={() => doThis}> (and don’t forget to close your tags… Watch for this: <div onClick={doThis} missing closing tag on the … Read more
Using ES6, the initial state must be created in your constructor for the React component class, like this: constructor(props) { super(props) this.state ={ // Set your state here } } See this documentation.
There are several ways to do this, but the simplest is to display the final image hidden, and then flip it to visible once it loads. JSBin Demo class Foo extends React.Component { constructor(){ super(); this.state = {loaded: false}; } render(){ return ( <div> {this.state.loaded ? null : <div style={{ background: ‘red’, height: ‘400px’, width: … Read more