HTML5 history API popstate event returns wrong data

The HTML5 History API's popstate event should return the correct data related to the state that caused the event. However, there might be some reasons why you are observing incorrect data. Let's go through some potential causes and solutions:

1. Multiple State Changes: The popstate event can be triggered by multiple state changes in the browser's history. If there have been multiple pushes to the history stack, the event might not return the data you expect. Make sure you're handling the popstate event appropriately to handle any possible state change.

2. Incorrect Data Structure: Double-check the data structure you are using to store state information with the History API. If you're using the pushState() method, ensure that the state object is properly formatted. The state parameter of pushState() can be any JSON-serializable object, and it will be returned as-is when the popstate event is triggered.

3. Event Listener Registration: Ensure that you have registered the event listener for popstate correctly. It's essential to bind the event handler before any state changes occur. For example, if you're using JavaScript, make sure the event listener is set up before calling pushState().

4. Page Load and Initial State: When the page initially loads, the popstate event may not be triggered. However, the initial state can still be accessed using the history.state property. If you need to handle the initial state, you can check for the existence of the history.state property on page load.

Here's an example of how to set up a basic popstate event listener:

javascriptCopy code
window.addEventListener('popstate', function(event) {
  // The event.state contains the state data associated with the popped state.
  var state = event.state;
  // Handle the state data appropriately.
});

// Example of adding a state to the history stack.
var stateData = { key: 'value' };
history.pushState(stateData, 'Title', '/new-url');

If you're still facing issues with incorrect data, please provide more specific details about your implementation and how you are handling the popstate event. This additional information can help identify the problem more accurately.