// aura cmp

<aura:component controller="AuraApex" implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global" >
    <aura:handler name="init" value="{!this}" action="{!c.doInit}"/>
    <aura:attribute name="AccountList" type="List" />
    <div>
        <lightning:select name="select1" label="List Of Account"  aura:id="AccountId"   required="false" >
            
            <aura:iteration items="{!v.AccountList}" var="ac" >
                <option value="{!ac.Id}" label="{!ac.Name}" />
            </aura:iteration>
        </lightning:select>
    </div>
    
    <aura:attribute name="LastName" type="String"  />
    <div>
        <lightning:input type="String" label="LastName" aura:id="lastn" value="{!v.LastName}" />
        <lightning:button variant="brand" label="Insert" title="Brand action" onclick="{! c.handleClick }" />    
    </div>
</aura:component>


/////// controller.js
({
	doInit : function(component, event, helper) {
		helper.helperMethod(component, event, helper);
	},
    
    handleClick: function(component, event, helper){
    helper.createContact(component, event, helper);
}
})

////////// helper.js

({
    helperMethod : function(component, event, helper) {
		var action=component.get("c.getAccount");
        action.setCallback(this,function(response){
            console.log(response.getReturnValue());
            if(response.getReturnValue()!=null){
                component.set("v.AccountList",response.getReturnValue());
            }
        });
        $A.enqueueAction(action);
    },
    createContact: function(component, event, helper) {
     var acid=component.find('AccountId').get('v.value');
     var lname=component.find('lastn').get('v.value');
        var action=component.get("c.AddContact");
      console.log(acid);
         console.log(action);
		 action.setParams({
            id1:acid,
            ln:lname          
        });
        action.setCallback(this,function(response){
           
            if(response.getReturnValue()!=null){
                console.log("inside callback");
                 console.log(JSON.stringify(response.getReturnValue()));
                alert("contact is inserted");
            }
        });
        $A.enqueueAction(action);
        
    }
})

//////////////   APEX

public with sharing class AuraApex {
   @AuraEnabled(cacheable = true)
    public static list<account> getAccount(){
        List<account> AccList = new list<account>();
        AccList = [select Id,Name from Account limit 100];
        system.debug('ac'+acclist);
        return AccList;
    }
    
    @auraenabled
    public static contact AddContact(id id1, string ln){
        system.debug('con apex'+id1+','+ln);
        contact c =new contact();
        c.AccountId = id1;
        c.LastName = ln;
        c.User_Name__c='ahsha';
		c.Password__c='qwqw';
        insert c;
        return c;
    }
}