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Update or change field values in the onsubmit event of lightning:recordeditform

INTRODUCTION

Occasionally, there may be a need to include or alter field values during the onsubmit event of lightning:recordeditform. In the following example, I am creating a record for the ‘Lead’ object using lightning:recordeditform, and within the onsubmit event, I am appending the ‘Description’ field value for the ‘Lead’ object.

Aura Component:

<!--Sample.cmp-->
<aura:component implements="flexipage:availableForAllPageTypes,force:appHostable">
     
    <!--Component-->
    <div class="slds-m-around--xx-large">
        <lightning:card title="Lead" iconName="standard:lead" class="slds-p-around_medium">
            <lightning:recordEditForm aura:id="leadCreateForm" objectApiName="Lead" onsubmit="{!c.handleOnSubmit}">
                <lightning:messages />
                 
                <div class="slds-grid">
                    <div class="slds-col slds-size_1-of-2 slds-p-around_medium">
                        <lightning:inputField fieldName="FirstName"></lightning:inputField>
                    </div>
                    <div class="slds-col slds-size_1-of-2 slds-p-around_medium">
                        <lightning:inputField fieldName="LastName"></lightning:inputField>
                    </div>
                </div>
                 
                <div class="slds-grid">
                    <div class="slds-col slds-size_1-of-2 slds-p-around_medium">
                        <lightning:inputField fieldName="Email"></lightning:inputField>
                    </div>
                    <div class="slds-col slds-size_1-of-2 slds-p-around_medium">
                        <lightning:inputField fieldName="Phone"></lightning:inputField>
                    </div>
                </div>
                 
                <div class="slds-grid">
                    <div class="slds-col slds-size_1-of-2 slds-p-around_medium">
                        <lightning:inputField fieldName="Company"></lightning:inputField>
                    </div>
                </div>
                 
                <lightning:button type="submit" label="Save" variant="brand"/>
            </lightning:recordEditForm>
        </lightning:card>
    </div>
</aura:component>

JavaScript controller:

({
    handleOnSubmit : function(component, event, helper) {
        event.preventDefault(); //Prevent default submit
        var eventFields = event.getParam("fields"); //get the fields
        eventFields["Description"] = 'Lead was created from Lightning RecordEditForm'; //Add Description field Value
        component.find('leadCreateForm').submit(eventFields); //Submit Form
    }
})