Hi Punith,

Greetings to you!

You can use event.getSource() in the client-side controller to get the button/checkbox component that was clicked. 

In the client-side controller, you can use one of the following methods to find out which button was clicked.

• event.getSource().getLocalId() returns the aura:id of the clicked button.
• event.getSource().get("v.value") returns the name of the clicked button.

Below is the sample code which will give you a clear idea about it.

Component:

<aura:component controller="ButtonToControllerC"
                implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global" >
    
    <aura:attribute name="mydata" type="List"/>
    
    <aura:handler name="init" value="{!this}" action="{!c.doinit}" />
    
    <div class="slds-section slds-is-open">
        <h3 class="slds-section__title slds-theme_shade">
            <span class="slds-truncate slds-p-horizontal_small" title="Section Title">Account Details Table - 1</span>
        </h3>
        <br/>
        <table class="slds-table slds-table--bordered slds-table--striped slds-table--cell-buffer slds-table--fixed-layout">
            <thead>
                <tr class="slds-text-heading--label">
                    <th scope="col"><div class="slds-truncate" title="Account Name">Account Name</div></th>
                    <th scope="col"><div class="slds-truncate" title="Phone">Phone</div></th>
                    <th scope="col"><div class="slds-truncate" title="Show" aura:id="selectAll"></div></th>
                </tr>
            </thead>
            <tbody>
                <aura:iteration items="{!v.mydata}" var="row">
                    <tr>
                        <th scope="row"><div class="slds-truncate" title="{!row.Name}">{!row.Name}</div></th>
                        <td><div class="slds-truncate" title="{!row.Phone}">{!row.Phone}</div></td>
                        <td>
                            <div>                           
                                <lightning:button label="SHOW"
                                                  value="{!row}"
                                                  iconName="utility:new"
                                                  iconPosition="left"
                                                  variant="brand"
                                                  onclick="{!c.show}"
                                                  />
                            </div>
                        </td>
                    </tr>
                </aura:iteration>
            </tbody>
        </table>
    </div>
</aura:component>

Controller:

({
    doinit : function(component, event, helper) {
		var action = component.get('c.fetchRecords');
        action.setCallback(this, function(response){
            var state = response.getState();
            if(state === "SUCCESS"){
                var allValues = response.getReturnValue();
                console.log("allValues--->>> " + allValues);
                component.set('v.mydata', allValues);
            }
            else if(state === "ERROR") {
                var errors = response.getError();
                if(errors){
                    if(errors[0] && errors[0].message){
                        console.log("Error Message: " + errors[0].message);
                    }
                }
                else{
                    console.log("Unknown Error");
                }
            }
        });
        $A.enqueueAction(action);
	},
    
    show : function(component, event, helper) {
        var rowRecord = event.getSource().get('v.value');
        alert('Buttom Pressed -> ' + JSON.stringify(rowRecord));
        console.log('rowRecord--->>> ' + JSON.stringify(rowRecord));
        
    }
})

Apex:

public class ButtonToControllerC {

    @AuraEnabled
    public static List<Account> fetchRecords() {
        return [SELECT Id, Name, Phone FROM Account];
    }
}

Please refer to below links which might help you further.

https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/js_cb_which_button_pressed.htm

https://developer.salesforce.com/forums/?id=906F0000000kAn0IAE

I hope it helps you.

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future. It will help to keep this community clean.

Thanks and Regards,
Khan Anas