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How to Prevent Server-Side Form Submission in a React Component?

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There are several ways to prevent form submission in a React component.

If we have a button inside the form, we can make set the button’s type to be button.

For instance, we can write:

<button type="button" onClick={this.onTestClick}>click me</Button>

If we have a form submit handler function passed into the onSubmit prop;

<form onSubmit={this.onSubmit}>

then in th onSubmit method, we call preventDefault to stop the default submit behavior.

For example, we can write:

onSubmit (event) {
  event.preventDefault();
  //...
}

TypeScript Type for the Match Object

We can use the RouteComponentProps interface, which is a generic interface that provides some base members.

We can pass in our own interface to match more members if we choose.

For example, we can write:

import { BrowserRouter as Router, Route, RouteComponentProps } from 'react-router-dom';

interface MatchParams {
  name: string;
}

interface MatchProps extends RouteComponentProps<MatchParams> {}

const App = () => {
  return (
    <Switch>
      <Route
         path="/products/:name"
         render={({ match }: MatchProps) => (
            <Product name={match.params.name}
         /> )}
      />
    </Switch>
  );
}

We use the MatchProps interface that we created as the type for the props parameter in the render prop.

Then we can reference match.params as we wish.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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