I have a lightning component which the goal of it is to open a page if some fields on the record are not null, how to compare those fields to null? Here the component:

<aura:component controller="purchaseOrderComponentController"
    <aura:handler name="init" value="{!this}" action="{!c.doInit}" />
    <aura:attribute name="recordId" type="Id" default="a0e2000000X2I9AAAV"/>
    <aura:attribute name="purchaseOrder" type="PBSI__PBSI_Purchase_Order__c"/>   

Here the JS controller:

    doInit : function (component, event) {
        var purchaseOrderId  = component.get("v.recordId");
        var action = component.get("c.getPurchaseOrder");
       // window.open('https://something.visual.force.com/apex/ReceivePO?id='+purchaseOrderId);
            "purchaseOrderId": purchaseOrderId
        action.setCallback(this,function (response){

            if (state === "SUCCESS") {
                // should compare the fields to null, the fields from the apex controller
                // if they are not null then open a page, otherwise show a message.

Here the apex controller:

public class purchaseOrderComponentController{
  public static  PBSI__PBSI_Purchase_Order__c getPurchaseOrder(Id purchaseOrderId) {
    return [SELECT Id, PBSI__Delivery_Location__c, Order_Confirmation_Number__c, Has_Misc_Item__c FROM PBSI__PBSI_Purchase_Order__c where Id=:purchaseOrderId limit 1];

You forgot to declare the state variable and get it from the response object, which might be your main issue. Adjust your code as follows.

    action.setCallback(this,function (response){
        var state = response.getState(),
            purchaseOrder = response.getReturnValue();
        if (state === "SUCCESS") {
            if(purchaseOrder.Order_Confirmation_Number__c) { // Modify this here //
               // you would redirect here //
            } else {
              // show an error //

I'll leave you to adjust the appropriate parts from here.


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