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Why My Family Ditched Windows for Ubuntu (And How You Can Too)

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Add multiple parent and their child in salesforce using visualforce page and apex class

Here is sample code to add multiple parent and child record using visualforce and apex in salesforce. Here we are using salesforce SLDS for styling. The result of this sample code is in below image.
Add multiple parent and child records
Visualforce Page:

 <apex:page controller="addmulptiplerecords" showHeader="false" lightningStylesheets="true">
    <html xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" lang="en">

        <head>
            <apex:slds />
        </head>
        <apex:form id="formid">
            <div class="slds-scope">
                <apex:actionRegion >
                    <apex:outputPanel id="ouputpanelID">
                        <apex:variable value="{!0}" var="AccountCounter" />                   
                        <apex:repeat value="{!list_AccountandContact}" id="repeatsection" var="ObjAcc">
                            <article class="slds-card">
                                <div class="slds-card__header slds-grid">
                                    <fieldset class="slds-form-element">
                                        <legend class="slds-form-element__label">
                                            <abbr class="slds-required" title="required"><span class="astric">*</span></abbr><b>Account</b>
                                        </legend>
                                        
                                        <div class="slds-form-element__group">                                             
                                            <apex:outputPanel id="Externalprincipalout">
                                                <table aria-multiselectable="false" class="slds-table slds-table_bordered slds-table_fixed-layout" role="grid">
                                                    <thead>                                            
                                                        <th class="slds-text-align_right" scope="col"  style = "width:40px;">
                                                            <div class="slds-checkbox">
                                                                <span id="column-group-header" class="slds-assistive-text">
                                                                    Choose a row
                                                                </span>
                                                            </div>
                                                        </th>
                                                        <th aria-label="Name" aria-sort="none" scope="col">
                                                            <div class="slds-grid slds-grid_vertical-align-center slds-has-flexi-truncate">
                                                                <span class="slds-truncate" title="Name">Name</span>
                                                            </div>
                                                        </th>                                                         
                                                        
                                                    </thead>                                                    
                                                    <tbody>
                                                        <tr class="slds-hint-parent">
                                                            <td class="slds-text-align_right" role="gridcell">
                                                                <div class="slds-form-element slds-align--absolute-center">
                                                                    <label class="slds-checkbox">
                                                                        <apex:inputCheckbox value="{!ObjAcc.selected}" />
                                                                        <span class="slds-checkbox--faux"></span>
                                                                    </label>
                                                                </div>
                                                            </td>
                                                            <td scope="row" tabindex="0">
                                                                <div class="slds-truncate">
                                                                    <apex:inputField value="{!ObjAcc.account.Name}" styleclass="slds-input" html-placeholder=" Enter Name " />                                                            
                                                                </div>
                                                            </td>                 
                                                        </tr>                                                        
                                                    </tbody>
                                                </table> 
                                                <table aria-multiselectable="false" class="slds-table slds-table_bordered slds-table_fixed-layout" role="grid">
                                                    <legend class="slds-form-element__label">
                                                        <abbr class="slds-required" title="required"><span class="astric">*</span></abbr><b>Contact</b>
                                                    </legend>
                                                    <thead>
                                                        <th aria-label="Name" aria-sort="none" scope="col">
                                                            <div class="slds-grid slds-grid_vertical-align-center slds-has-flexi-truncate">
                                                                <span class="slds-truncate" title="Name">First Name</span>
                                                            </div>
                                                        </th>
                                                        <th aria-label="Name" aria-sort="none" scope="col">
                                                            <div class="slds-grid slds-grid_vertical-align-center slds-has-flexi-truncate">
                                                                <span class="slds-truncate" title="Name">Last Name</span>
                                                            </div>
                                                        </th>
                                                        <th class="slds-text-align_right" scope="col"  style = "width:40px;">
                                                            
                                                            <div class="slds-checkbox">
                                                                <span id="column-group-header" class="slds-assistive-text">
                                                                    Choose a row
                                                                </span>
                                                            </div>
                                                        </th>                                                               
                                                        
                                                    </thead>
                                                    <apex:variable value="{!0}" var="ContactCounter" />
                                                    <tbody>
                                                        <apex:repeat value="{!ObjAcc.Contactwrapper}" id="ContactRepeat" var="ObjCon">
                                                            <tr class="slds-hint-parent">
                                                                <td scope="row" tabindex="0">
                                                                    <div class="slds-truncate">
                                                                        <apex:inputField value="{!ObjCon.contact.firstName}" styleclass="slds-input" html-placeholder=" Enter Name " />
                                                                    </div>
                                                                </td>
                                                                <td role="gridcell">
                                                                    <div class="slds-truncate slds-cell-wrap" > 
                                                                        <apex:inputField value="{!ObjCon.contact.LastName}" required="false" styleclass="slds-input"  html-placeholder=" " style="line-height: 20px;"/>
                                                                    </div>
                                                                </td>                                                                
                                                                <td class="slds-text-align_left" role="gridcell">
                                                                    <div class="slds-form-element slds-align--absolute-center">                                                                                   
                                                                        <apex:commandlink id="delContact" value=" X " action="{!DelContact}" styleClass="delBtn" reRender="ouputpanelID" rendered="{!if(ObjAcc.Contactwrapper.size>1,true,false)}">
                                                                            <apex:param name="AccountRow" value="{!AccountCounter}" assignTo="{!AccountRowNo}"/>
                                                                            <apex:param name="ContactRow" value="{!ContactCounter}" assignTo="{!ContactRowNo}"/>
                                                                        </apex:commandlink>
                                                                    </div>
                                                                </td>                                                                
                                                            </tr>
                                                            <apex:variable var="ContactRowNo" value="{!ContactRowNo+ 1}" />
                                                        </apex:repeat>
                                                    </tbody>
                                                </table>
                                                <div class="slds-form-element__row slds-float_right">
                                                    <apex:commandLink id="AddContact" value="Add Contact" action="{!addContact}" styleClass="addBtn" reRender="ouputpanelID">
                                                        <apex:param name="AccountRowNo" value="{!AccountCounter}" assignTo="{!AccountRowNo}"/>
                                                    </apex:commandLink>
                                                </div>
                                            </apex:outputPanel>
                                        </div>
                                    </fieldset>
                                </div>
                            </article>  
                            <apex:variable var="AccountCounter" value="{!AccountCounter+ 1}" />
                        </apex:repeat>
                        <div class="slds-form-element__row">
                            <div class="slds-form-element slds-size_1-of-1 slds-float_right">                                
                                <apex:commandButton id="del" value="Delete" action="{!DeleteSelectedAccount}" styleClass="addBtn" reRender="ouputpanelID" rendered="{!if(list_AccountandContact.size>1,true,false)}"/>
                                <apex:commandButton id="Adde" value="Add" action="{!addAccountandContact}" reRender="ouputpanelID" styleClass="addBtn" />
                            </div>
                        </div>
                    </apex:outputPanel>
                </apex:actionRegion>
            </div>
        </apex:form>
    </html>
</apex:page>

Apex Class:-
public class addmulptiplerecords {
    public list<accountwrapper> list_AccountandContact{get;set;}
    public integer AccountRowNo{get;set;}
    public integer ContactRowNo{get;set;}
    public addmulptiplerecords (){
        list_AccountandContact= new list<accountwrapper>{new accountwrapper(new account() ,
                                                                            new list<Contact_Wrapper>{new Contact_Wrapper(new contact())})};
                                                                                }
    
    public void addExternalParty(){
        list_AccountandContact.add(new accountwrapper(new account() ,new list<Contact_Wrapper>{new Contact_Wrapper(new contact())}));             
    }    
    
    public void DelContact(){
        list_AccountandContact.get(AccountRowNo).Contactwrapper .remove(ContactRowNo);
    }
    
    public void addContact(){
        list_AccountandContact.get(AccountRowNo).Contactwrapper.add(New Contact_Wrapper(new Contact()));       
    }
    
    public void DeleteSelectedAccount(){ 
        List<accountwrapper> TempUserData=new List<accountwrapper>();        
        List<accountwrapper> DelUserData=new List<accountwrapper>();
        for(accountwrapper WrapAcc : list_AccountandContact){
            if(WrapAcc.selected ==false){
                TempUserData.add(WrapAcc);
            }
            list_AccountandContact=TempUserData;
        }
        return;
    }
    
    public void addAccountandContact(){
        list_AccountandContact.add(new accountwrapper(new account() ,new list<Contact_Wrapper>{new Contact_Wrapper(new contact())}));
        
    }    
    public class accountwrapper{
        public account account{get; set;}
        public Boolean selected {get;set;}
        public integer index{get;set;}
        public list<Contact_Wrapper> Contactwrapper {get;set;}
        
        public accountwrapper(account Obj_Account, list<Contact_Wrapper> lst_Contact){
            this.account= Obj_Account;
            this.selected = false;
            this.Contactwrapper =lst_Contact;
        }
    }    
    public class Contact_Wrapper{
        public contact Contact {get; set;}
        public Boolean selectedContact {get;set;}
        public integer parentIndex{get;set;}
        
        public Contact_Wrapper(contact con){
            this.contact= con;
            this.selectedContact = false;
        }
    }
}
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