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Lightning datatable does not have a straight forward onclick event where you can identify which row has been clicked. But it can be achieved with a bit of fiddling.

<lightning-datatable ... onclick={handleClick}></lightning-datatable>

handleClick(event) {
    const rowNode = event.toElement.closest('tr');

    // Row index (-1 to account for header row)
    console.log(rowNode.rowIndex - 1);

    // Row Id
    console.log(rowNode.dataset.rowKeyValue);

    // Use either of these to get the row data from the table data
}

Other Approaches

There are other approaches to this that provides a decent user experience such as using a row button as Rahul Gawale mentions.

Setup your datatable to handle the rowaction event:

<lightning-datatable ... onrowaction={handleRowAction}></lightning-datatable>

Add a column to the datatable for a button:

{  
    type: 'button', 
    typeAttributes: {
        label: 'Click me'
    }
}

Define a handler for the row action:

handleRowAction(event) {
    // contains properties of the clicked row
    const row = event.detail.row;

}

Other approaches using datatable include:

• Show the checkboxes and handle onrowselection - 1 click
• Use an action column with a dropdown of actions - 2 clicks

Lightning datatable does not have an onclick event where you can identify which row has been clicked. But it can be achieved with a bit of fiddling.

The following worked in playground, but does not work in regular environments.

<lightning-datatable ... onclick={handleClick}></lightning-datatable>

handleClick(event) {
    const rowNode = event.toElement.closest('tr');

    // Row index (-1 to account for header row)
    console.log(rowNode.rowIndex - 1);

    // Row Id
    console.log(rowNode.dataset.rowKeyValue);

    // Use either of these to get the row data from the table data
}

Other Approaches

There are other approaches to this that provides a decent user experience such as using a row button as Rahul Gawale mentions.

Setup your datatable to handle the rowaction event:

<lightning-datatable ... onrowaction={handleRowAction}></lightning-datatable>

Add a column to the datatable for a button:

{  
    type: 'button', 
    typeAttributes: {
        label: 'Click me'
    }
}

Define a handler for the row action:

handleRowAction(event) {
    // contains properties of the clicked row
    const row = event.detail.row;

}

Other approaches using datatable include:

• Show the checkboxes and handle onrowselection - 1 click
• Use an action column with a dropdown of actions - 2 clicks

Lightning datatable does not have a straight forward onclick event where you can identify which row has been clicked. But it can be achieved with a bit of fiddling.

<lightning-datatable ... onclick={handleClick}></lightning-datatable>

handleClick(event) {
    const rowNode = event.toElement.closest('tr');

    // Row index
    console.log(rowNode.rowIndex);

    // Row Id
    console.log(rowNode.dataset.rowKeyValue);

    // Use either of these to get the row data from the table data
}

Other Approaches

There are other approaches to this that provides a decent user experience such as using a row button as Rahul Gawale mentions.

Setup your datatable to handle the rowaction event:

<lightning-datatable ... onrowaction={handleRowAction}></lightning-datatable>

Add a column to the datatable for a button:

{  
    type: 'button', 
    typeAttributes: {
        label: 'Click me'
    }
}

Define a handler for the row action:

handleRowAction(event) {
    // contains properties of the clicked row
    const row = event.detail.row;

}

Other approaches using datatable include:

• Show the checkboxes and handle onrowselection - 1 click
• Use an action column with a dropdown of actions - 2 clicks

Lightning datatable does not have a straight forward onclick event where you can identify which row has been clicked. But it can be achieved with a bit of fiddling.

<lightning-datatable ... onclick={handleClick}></lightning-datatable>

handleClick(event) {
    const rowNode = event.toElement.closest('tr');

    // Row index (-1 to account for header row)
    console.log(rowNode.rowIndex - 1);

    // Row Id
    console.log(rowNode.dataset.rowKeyValue);

    // Use either of these to get the row data from the table data
}

Other Approaches

There are other approaches to this that provides a decent user experience such as using a row button as Rahul Gawale mentions.

Setup your datatable to handle the rowaction event:

<lightning-datatable ... onrowaction={handleRowAction}></lightning-datatable>

Add a column to the datatable for a button:

{  
    type: 'button', 
    typeAttributes: {
        label: 'Click me'
    }
}

Define a handler for the row action:

handleRowAction(event) {
    // contains properties of the clicked row
    const row = event.detail.row;

}

Other approaches using datatable include:

• Show the checkboxes and handle onrowselection - 1 click
• Use an action column with a dropdown of actions - 2 clicks

Lightning datatable does not have a straight forward onclick event where you can identify which row has been clicked. However, there are other approaches to this that provides a decent user experience such as using a row button as Rahul Gawale mentions.

Setup your datatable to handle the rowaction event:

<lightning-datatable ... onrowaction={handleRowAction}></lightning-datatable>

Add a column to the datatable for a button:

{  
    type: 'button', 
    typeAttributes: {
        label: 'Click me'
    }
}

Define a handler for the row action:

handleRowAction(event) {
    // contains properties of the clicked row
    const row = event.detail.row;

}

Other approaches using datatable include:

• Show the checkboxes and handle onrowselection - 1 click
• Use an action column with a dropdown of actions - 2 clicks

Lightning datatable does not have a straight forward onclick event where you can identify which row has been clicked. But it can be achieved with a bit of fiddling.

<lightning-datatable ... onclick={handleClick}></lightning-datatable>

handleClick(event) {
    const rowNode = event.toElement.closest('tr');

    // Row index
    console.log(rowNode.rowIndex);

    // Row Id
    console.log(rowNode.dataset.rowKeyValue);

    // Use either of these to get the row data from the table data
}

Other Approaches

There are other approaches to this that provides a decent user experience such as using a row button as Rahul Gawale mentions.

Setup your datatable to handle the rowaction event:

<lightning-datatable ... onrowaction={handleRowAction}></lightning-datatable>

Add a column to the datatable for a button:

{  
    type: 'button', 
    typeAttributes: {
        label: 'Click me'
    }
}

Define a handler for the row action:

handleRowAction(event) {
    // contains properties of the clicked row
    const row = event.detail.row;

}

Other approaches using datatable include:

• Show the checkboxes and handle onrowselection - 1 click
• Use an action column with a dropdown of actions - 2 clicks