How to Delete Multiple Records Using Checkbox In Lightning Component.

public class LeadHandler {
@AuraEnabled
    public static List<Lead> featchLead() {
    //Returning list of leads.
        return [SELECT Id, Name,Company,Status,Phone,Email FROM Lead];
    }
     
     @AuraEnabled
    public static void DeleteRecord(List<Lead> DeleteIds) {
        List<Lead> delacccon = new List<Lead>();
        for(Lead con : [SELECT Id, Name,Company,Status,Phone,Email FROM Lead WHERE Id IN : DeleteIds]){
            delacccon.add(con);
        }
        
        if(delacccon.size() > 0){
            Delete  delacccon;
        }
        
    }
}

<aura:component implements="flexipage:availableForAllPageTypes" access="global" controller="LeadHandler">
	<!--Used to load the data-->
    <aura:handler name="init" value="{! this }" action="{! c.init }"/>
	<!--Force:refreshView is an event that can be used to refresh the view.-->
    <aura:handler event="force:refreshView" action="{!c.init}" />
    <aura:attribute name="columns" type="List"/>
    <aura:attribute name="data" type="Object"/>
    <aura:attribute name="selectedLeads" type="List"/>
    <aura:attribute name="selectedRowsCount" type="Integer" default="0"/>
    <aura:attribute name="showDeleteBox" type="boolean" default="false"/>
    <aura:attribute name="ButtonShow" type="boolean" default="false"/>
	
    <lightning:card title="Lead Details">
        <div class="slds-clearfix">
            <div class="slds-m-left_medium"> Selected Leads: {! v.selectedRowsCount }</div>
            <div class="slds-float_right">
                <aura:if isTrue="{!v.ButtonShow}">
                <lightning:button variant="brand" label="Delete Lead" title="Brand action" onclick="{!c.handleConfirmDialog }" class="slds-m-bottom_large"/>
            </aura:if>
            </div>
        </div>
        <div style="height: 300px">
            <lightning:datatable
                                 columns="{! v.columns }"
                                 data="{! v.data }"
                                 keyField="id"
                                 onrowselection="{! c.updateSelectedText}"
                                 />
        </div>
    </lightning:card>
	
	<!--Added if to render the modal for confirmation.-->
    <aura:if isTrue="{!v.showDeleteBox}">
        <div role="dialog" class="slds-modal slds-fade-in-open ">
            <div class="slds-modal__container">
                <header class="slds-modal__header">
                    <h1 class="slds-text-heading--medium">Confirmation to Delete Selected Records.</h1>
                </header>
                <div class="slds-modal__content slds-p-around--medium">
                    <center><b>If you click Delete records will be deleted or Cancel to stay on this page.</b></center>
                </div>
                <footer class="slds-modal__footer">
                    <lightning:button name='Cancel' label='Cancel' onclick='{!c.handleConfirmDialogCancel}'/>
                    <lightning:button variant="brand" name='Delete' label='Delete' onclick='{!c.handleClick}'/>
                </footer>
            </div>
        </div>
        <div class="slds-backdrop slds-backdrop--open"></div> 
    </aura:if>
</aura:component>

({
	//function to show the leads records.
    init : function(component, event, helper) {
		//Data-table columns.
        component.set('v.columns', [
            {label: 'Lead name', fieldName: 'Name', type: 'text'},
            {label: 'Company', fieldName: 'Company', type: 'text'},
            {label: 'Phone', fieldName: 'Phone', type: 'Phone'},
            {label: 'Email', fieldName: 'Email', type: 'Email'},
            {label: 'Status', fieldName: 'Status', type: 'Picklist'}
            
        ]);
        //Calling apex method to featch the lead details.
        var action = component.get('c.featchLead');
        action.setCallback(this, function(response) {
            //store state of response
            var state = response.getState();
            if (state === "SUCCESS") {
				//Storing the reponse from server side to an attribute.
                component.set('v.data', response.getReturnValue());               
            }
        });
        $A.enqueueAction(action);
    },
	//Function to fetch recordIds of each row and to show the count.
    updateSelectedText: function (component, event) {
		//Get sleceted Checkbox rows.
        var selectedRows = event.getParam('selectedRows');
		//Store a count in an attribute.
        component.set('v.selectedRowsCount', selectedRows.length);
		//Stored in var to display count in console.
		//You can skip next two lines.
        var slectCount =selectedRows.length;
        console.log('slectCount'+slectCount);
		//Created var to store record id's for selected checkboxes. 
        var setRows = [];
        for ( var i = 0; i < selectedRows.length; i++ ) {
            
            setRows.push(selectedRows[i]);
            
        }
		//Adding slelected recordIds to an attribute.
        component.set("v.selectedLeads", setRows);
        console.log('selected data:'+setRows);

		//Added this condition to show the button "Delete Leads".
		//If checkbox is selected then only it will show else no.
        if(slectCount>0){
            component.set('v.ButtonShow', true);
        }else{
            component.set('v.ButtonShow', false);
        }
    },

	//This fucntion to handle a delete functionality.
    handleClick : function(component, event, helper){
		//Created var that store the recordIds of selected rows.
        var records = component.get("v.selectedLeads");
		//Console log.
        console.log(records);
		//Calling helper to perform delete action.
        helper.deltingCheckboxAccounts(component, event, records);
    },

	// function to handle the Modal Popup window.
    handleConfirmDialog : function(component, event, helper) {
        component.set('v.showDeleteBox', true);
    },

	//Function to handle Cancel Popup.
    handleConfirmDialogCancel : function(component, event, helper) {
        console.log('Cancel');
        component.set('v.showDeleteBox', false);
    },
})

({
//To perform delete action.
	deltingCheckboxAccounts : function(component, event, deltIds) {
	//Calling apex method.
        var action = component.get('c.DeleteRecord');
		//passing the all selected record's Id's to apex method.
        action.setParams({
            "DeleteIds": deltIds
        });
       //Getting response.
        action.setCallback(this, function(response) {
            var state = response.getState();
			//If state is sucess then refreshing the View.
            if (state === "SUCCESS") {
                console.log('Inside delete'+state);
				//Refresh the View.
                $A.get('e.force:refreshView').fire();
            }
        });
        
        $A.enqueueAction(action);
    }
})