Why Does My React onClick Function Fire on Render?

React onClick Function Firing on Render

When creating React components that render lists of objects, it's common to pass both the objects and a function for deleting them as props. While using .map() to iterate over the objects is standard, it can lead to the onClick function firing prematurely during rendering.

In the provided code, the issue stem from the fact that the removeTaskFunction is being called directly in the onClick event handler. This means that the function is executed as soon as the component is rendered, not when the button is clicked.

Solution

To resolve this, the function should be passed as an arrow function to onClick, ensuring that it's not invoked prematurely. The corrected line should look like:

<button type="submit" onClick={() => this.props.removeTaskFunction(todo)}>Submit</button>

Arrow functions, introduced in ES6, delay execution until the function is called. In React 0.13.3 or later, arrow functions are fully supported. By using an arrow function, the onClick handler will only trigger when the button is actually clicked, as intended.

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