react setstate callback not working

You cannot always trust this.state to hold the correct state immediately after calling setState(), as it is always equal to the state rendered on the screen. You can use .bind to bind the this value of... You can use a component like react-document-title to solve the problem. ... You should use defaultValue and not value. I think you just need to enable BrowserHistory on your router by intializing it like that : . But still, it is not immediate. This tree is used to figure out how the Search component’s UI should change in response to the state change by comparing it with the elements of the previous tree. However, if your setState depends on the previous state values, you may be in trouble. To demonstrate this idea further, let’s create a simple counter that increments and decrements on click. It works pretty much in the same way as for setState: The setter function (in our case setCount) can take a function as a parameter. And what about the call back of the setState function? You could actually hold all of the state in the parent, using it as a single point of truth, and pass the "selected" value down to each child as... Yeah, you don't want to use refs like this really. Modifying state directly, like the snippet below will not cause the component to re-render. Keep calm. React guarantees that the functional setState calls will be executed in the order they were called. Also, where is your actual render method? Each time the button to decrement is clicked, the count will decrement by 1 instead of 3. Removing overflow: hidden; solved the problem. Spread operator copies all values from your state into the new object so that you don’t lose any of your state values. When using a useState hook, we start with getting an initial value of the state and a setter function as a resut of useState call: Where 0 passed to useState is the initial value of count state. Or it may be 1 if the first setState was scheduled for the later execution. It does not return a value. prevState is a reference to the previous state. Here’s a simpler version of how Object.assign() works; So instead of the call happening three times, it happens just once. JSFiddle Demo The reason I'm including it is because the forceUpdate() can be useful in cases like yours where the data that is... After scrolling on IPad, some content of my website is hidden behind a white area. Also createClass takes objects so each method should be separated by a comma. Since your SVG content is stored as a string and not as a React element, you'll need to use Dangerously Set innerHTML. setState takes a callback as its second argument.. We’ve looked at handling asynchronous state with lifecycle methods.But, to be honest, it’s a lot of ceremony for some simple needs. If you are adding elements to the list and handling the new immutable collections that are returned, then you need the immutable list. If I understand your situation correctly, the easiest thing to do is create a "base" component that you inherit from. This function looks like this: What we want is the ability to decrement by 3. But what if we wanted to increment or decrement by 3 instead? That sounds like a lot, but to sum up the flow: The reconciliation process does not necessarily change the entire tree, except in a situation where the root of the tree is changed like this: All