How can I show a React alert only once on page load without triggering it during modal actions?

Below is one common solution for ensuring an alert runs only once—namely, moving the alert code out of render and into a lifecycle method that runs only on the first mount of the component. In React 16 class components, you can use componentDidMount to trigger the alert when the component loads, then update your state so the alert won’t run again.

Here’s an updated example:

JAVASCRIPTCopied
export default class List extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      showTotals: true,
    };
  }

  componentDidMount() {
    const { total_values, contract_total } = this.props; // or however you get these values
    if (total_values > contract_total && this.state.showTotals) {
      swal('', 'Total is greater than ...', 'error');
      this.setState({ showTotals: false });
    }
  }

  // For other actions like delete, add, and edit, you can handle them separately.
  handleDelActClick = (row, id) => {
    // Whatever removal or other process you need.
    this.delItem(row.id, id);
  };

  render() {
    return (
      <div>
        {/* Your other UI code */}
        <Button onClick={() => this.handleDelActClick(row, rowId)}>
          <i>delete</i>
        </Button>
      </div>
    );
  }
}

Key Points

• Use componentDidMount: The alert is now triggered only after the component has mounted (i.e. page load) since componentDidMount runs once per mount.
• Update State Once: After displaying the alert, updating the state (showTotals: false) ensures that if the component re-renders for any reason—even if conditions remain the same—the alert won’t fire again.
• Separate Concerns: By keeping the alert logic away from the render method, you avoid inadvertently running it during other actions (such as deleting or editing).

This approach cleanly separates the initial load behavior from later user actions.