Dependent picklist in Aura

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 ....Component....

<aura:component controller="MinorAssignment" implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global" >

    <aura:attribute name="fName" type="string"/>

    <aura:attribute name="lName" type="string"/>

    <aura:attribute name="email" type="string"/>

    <aura:attribute name="phn" type="string"/>

    <aura:attribute name="selectedBusinessVertical" type="String"/>

    <aura:attribute name="selectedDivisionVertical" type="String"/>

    <aura:attribute name="selectedAreaOfDivision" type="String"/>

    <aura:attribute name="availableDivisionOfVertical" type="List"/>

    <aura:attribute name="availableAreaOfDivision" type="List"/>

    

    <div class="slds-box slds-box_small slds-theme_shade slds-theme_alert-texture slds-align_absolute-center" Style ="font-size:20px">General Information</div>

    <div class="slds-form slds-p-horizontal_large slds-p-vertical_small slds-m-top_medium" role="list">

        <div class="slds-form__row">

            <div class="slds-form__item" role="listitem">

                <div class="slds-form-element slds-form-element_horizontal slds-hint-parent">

                    <span class="slds-form-element__label">First Name</span>

                    <div class="slds-form-element__control" style="padding-left:70px;">

                        <lightning:input label="First Name" value="{!v.fName}" variant="label-hidden" required="true"/>

                    </div>

                </div>

            </div>

            <div class="slds-form__item" role="listitem">

                <div class="slds-form-element slds-form-element_horizontal slds-hint-parent">

                    <span class="slds-form-element__label">Last Name</span>

                    <div class="slds-form-element__control" style="padding-left:70px;">

                        <lightning:input label="Last Name" value="{!v.lName}" variant="label-hidden" required="true"/>

                    </div>

                </div>

            </div>

        </div>

    </div>

     <div class="slds-form slds-p-horizontal_large slds-p-vertical_small " role="list">

        <div class="slds-form__row">

            <div class="slds-form__item" role="listitem">

                <div class="slds-form-element slds-form-element_horizontal slds-hint-parent">

                    <span class="slds-form-element__label">Eamil</span>

                    <div class="slds-form-element__control" style="padding-left:60px;">

                        <lightning:input label="Eamil" value="{!v.email}" variant="label-hidden" required="true"/>

                    </div>

                </div>

            </div>

            <div class="slds-form__item" role="listitem">

                <div class="slds-form-element slds-form-element_horizontal slds-hint-parent">

                    <span class="slds-form-element__label">Phone</span>

                    <div class="slds-form-element__control" style="padding-left:60px;">

                        <lightning:input label="Phone" value="{!v.phn}" variant="label-hidden" required="true"/>

                    </div>

                </div>

            </div>

        </div>

    </div>

    <br> </br>

    <div class="slds-box slds-box_small slds-theme_shade slds-theme_alert-texture slds-align_absolute-center" Style ="font-size:20px">Industry Information</div>

    <div class="slds-form-element slds-form-element_horizontal slds-hint-parent">

        <div class="slds-form-element__control slds-m-top_medium" style="padding-left:40px;">

            

            <lightning:select name="BusinessVertical" value="{!v.selectedBusinessVertical}" onchange="{!c.getDivisionOfVertical}" label="Business Vertical" required="true">

                <option value="">choose one...</option>

                <option value="Finance">Finance</option> 

                <option value="HealthCare">HealthCare</option>

                <option value="Automobile">Automobile</option>

                <option value="Education">Education</option>

                <option value="TeleCommunications">TeleCommunications</option>

            </lightning:select>

             </div>

    </div>

      <div class="slds-form-element slds-form-element_horizontal slds-hint-parent">

        <div class="slds-form-element__control slds-m-top_medium" style="padding-left:40px;">

            <lightning:select name="DivisionOfVertical" value="{!v.selectedDivisionVertical}" onchange="{!c.getAreaOfDivision}" label="Division Of Vertical" required="true">

                <option value="">choose one...</option>

                <aura:iteration items="{!v.availableDivisionOfVertical}" var="c">

                    <option value="{!c}">{!c}</option>

                </aura:iteration>

            </lightning:select>

        </div>

    </div>

    

    <div class="slds-form-element slds-form-element_horizontal slds-hint-parent">

        <div class="slds-form-element__control slds-m-top_medium" style="padding-left:40px;">

            <lightning:select name="AreaOfDivision" value="{!v.selectedAreaOfDivision}" label="Area of Division">

                <option value="">choose one...</option>

                <aura:iteration items="{!v.availableAreaOfDivision}" var="a">

                    <option value="{!a}">{!a}</option>

                </aura:iteration>

            </lightning:select>

        </div>

    </div>

    <div class="slds-m-left_small">

        <lightning:button aura:Id="SaveBtn" label="save" onclick="{!c.saveContact}" variant="Destructive" />

    </div>

</aura:component>


....Controller.js....


({

    getDivisionOfVertical: function(component, event, helper) {

        helper.getDivisionOfVerticalhelper(component, event, helper);

    },

    

    getAreaOfDivision: function(component, event, helper) {

        helper.getAreaOfDivisionhelper(component, event, helper);

    },

      saveContact : function(component, event, helper) {

        var fName = component.get("v.fName");

        var lName = component.get("v.lName");

        var email = component.get("v.email");

        var phn = component.get("v.phn");

        var BusinessVertical = component.get("v.selectedBusinessVertical");

        var DivisionOfVertical = component.get("v.selectedDivisionVertical");

        var AreaofDivision = component.get("v.selectedAreaOfDivision");

           console.log('fName : '+fName);

        console.log('lName : '+lName);

        console.log('email : '+email);

        console.log('phn : '+phn);

      var action = component.get("c.saveContacts");

        action.setParams({ fName : component.get("v.fName"),

                          lName : component.get("v.lName"),

                          email : component.get("v.email"),

                          phn : component.get("v.phn"),

                          BusinessVertical : component.get("v.selectedBusinessVertical"),

                          DivisionOfVertical : component.get("v.selectedDivisionVertical"),

                          AreaOfDivision : component.get("v.selectedAreaOfDivision")

                         });

        action.setCallback(this, function(response) {

            var state = response.getState();

            if (state === "SUCCESS") {

             alert("Saved Sucessfully");

          } else {

                console.log(response.getError());

            }

        });

         $A.enqueueAction(action);  

    }

})


....Helper.js....


({

    getDivisionOfVerticalhelper : function(component, event, helper) {

        var action = component.get("c.getDivisionVerticalByBusinessVertical");

        action.setParams({  BusinessVertical : component.get("v.selectedBusinessVertical") });

        action.setCallback(this, function(response) {

            var state = response.getState();

            if (state === "SUCCESS") {

                component.set('v.availableDivisionOfVertical',response.getReturnValue());

            }

   });

            $A.enqueueAction(action);

    },

      getAreaOfDivisionhelper : function(component, event, helper) {

        var action = component.get("c.getAreaOfDivisionByDivisionVertical");

          action.setParams({  DivisionVertical : component.get("v.selectedDivisionVertical") });

        action.setCallback(this, function(response) {

            var state = response.getState();

            if (state === "SUCCESS") {

                component.set('v.availableAreaOfDivision',response.getReturnValue());

            } else{

                console.log(response.getError());

            }

              });

          $A.enqueueAction(action);

    }

})




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