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Will Jones 18Will Jones 18 

How to add lookup field on Visualforce page?

I have a visualforce page that is used to pull through attachments on the opportunity page. It is based off of the work Jeff Douglas did:


The visualforce page and controller works fine but now I am having trouble adding a lookup field.

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The lookup field is based on a related list on the opportunity page. How do I add this field to the controller and page to make sure that a user can do a lookup and choose a "Vendor Event Details" that is associated with the current opportunity?

public class UploadAttachmentController {
    public String contractType {get;set;}
    public String description {get;set;}
    String AttachmentId;
    public Attachment__c VED {get;set;}
    private Opportunity Opportunity {get;set;} 
    public String fileName {get;set;}
    public Blob fileBody {get;set;}
    public UploadAttachmentController(ApexPages.StandardController controller) { 
        this.Opportunity = (Opportunity)controller.getRecord();
        VED = new Attachment__c();
        VED.Opportunity__c = this.Opportunity.Id;
    // creates a new Attachment__c record
    private Database.SaveResult saveCustomAttachment() {
        Attachment__c obj = new Attachment__c();
        obj.Opportunity__c = Opportunity.Id;
        obj.description__c = description;
        obj.Contract_Type__c = contractType;
        obj.Vendor_Event_Detail__c = VED.Id;
        return Database.insert(obj);
    // create an actual Attachment record with the Attachment__c as parent
    private Database.SaveResult saveStandardAttachment(Id parentId) {
        Database.SaveResult result;
        Attachment attachment = new Attachment();
        attachment.body = this.fileBody;
        attachment.name = this.fileName;
        attachment.parentId = parentId;
        // insert the attachment
        result = Database.insert(attachment);
        // reset the file for the view state
        fileBody = Blob.valueOf(' ');
        return result;
    * Upload process is:
    *  1. Insert new Attachment__c record
    *  2. Insert new Attachment with the new Attachment__c record as parent
    *  3. Update the Attachment__c record with the ID of the new Attachment
    public PageReference processUpload() {
        try {
            Database.SaveResult customAttachmentResult = saveCustomAttachment();
            if (customAttachmentResult == null || !customAttachmentResult.isSuccess()) {
                ApexPages.AddMessage(new ApexPages.Message(ApexPages.Severity.ERROR, 
                  'Could not save attachment.'));
                return null;
            Database.SaveResult attachmentResult = saveStandardAttachment(customAttachmentResult.getId());
            if (attachmentResult == null || !attachmentResult.isSuccess()) {
                ApexPages.AddMessage(new ApexPages.Message(ApexPages.Severity.ERROR, 
                  'Could not save attachment.'));            
                return null;
            } else {
                // update the custom attachment record with some attachment info
                Attachment__c customAttachment = [select id, Vendor_Event_Detail__c from Attachment__c where id = :customAttachmentResult.getId()];
                customAttachment.name = this.fileName;
                customAttachment.Attachment__c = attachmentResult.getId();
                AttachmentId = customAttachmentResult.getId();           
                update customAttachment;
        } catch (Exception e) {
            return null;
        return new PageReference('/'+AttachmentId);
    public PageReference back() {
        return new PageReference('/'+Opportunity.Id);

<apex:page standardController="Opportunity" tabStyle="Opportunity" extensions="UploadAttachmentController">
 <apex:sectionHeader title="{!Opportunity.Name}" subtitle="Attach File"/>
 <apex:form id="form_Upload">
 <apex:pageBlock >
 <apex:pageBlockButtons >
   <apex:commandButton action="{!back}" value="Back to {!Opportunity.Name}"/>
   <apex:commandButton action="{!back}" value="Cancel"/>
 <apex:pageMessages />
  <apex:pageBlockSection columns="1">
    <apex:pageBlockSectionItem >
      <apex:outputLabel value="File" for="file_File"/>
      <apex:inputFile id="file_File" value="{!fileBody}" filename="{!fileName}"/>
    <apex:pageBlockSectionItem >
      <apex:outputLabel value="Vendor Event Detail" for="VED"/>
      <apex:inputField id="VED" value="{!VED.Id}"/>

    <apex:pageBlockSectionItem >
      <apex:outputLabel value="Contract Type" for="contractType"/>
      <apex:selectList value="{!contractType}" size="1" id="type">
        <apex:selectOption itemvalue=""  itemLabel="--None--"/> 
        <apex:selectOption itemValue="Executed" itemLabel="Executed"/>
        <apex:selectOption itemValue="Final" itemLabel="Final"/>
    <apex:pageBlockSectionItem >
      <apex:outputLabel value="Description" for="description"/> 
      <apex:inputTextarea id="description" value="{!description}" rows="4" cols="50"/>
    <apex:pageBlockSectionItem >
      <apex:outputLabel value="" for="uploadBtn"/> 
      <apex:commandButton id="uploadBtn" value="Attach File" action="{!processUpload}" />

Tejpal KumawatTejpal Kumawat
Hello Will Jones,

Can you replace line 23 with this line :
<apex:inputField id="VED" value="{!VED.Vendor_Event_Detail__c}"/>
If this answers your question then hit Like and mark it as solution!

Will Jones 18Will Jones 18
Hi Tejpal,

That solved one problem. I now see the lookup field:

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However when I do the lookup it does not return any of the related Vendor Event Details. It is always empty. Any suggestions on how to ensure that I am able to search on all of the Vendor Event Details related to the Opportunity?

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Tejpal KumawatTejpal Kumawat
Hello Will Jones,

Have you Vendor Event Detail records or have you any lookup filters?
Will Jones 18Will Jones 18
Yes, on the opportunity there are Vendor Event Detail records. And yes there is a filter on the lookup field. It works when I go to the Attachment record (which is also a related list on the opportunity). It just doesn't work when I try to access it from the Visualforce Page (which is the front end of what you see below). I think my controller is incorrect but I'm not sure where to start with adjusting it.

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Will Jones 18Will Jones 18
Here is the lookup field details:

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Will Jones 18Will Jones 18
Any suggestions on how I can make sure that the Vendor Event Detail Lookup search returns records related to the Opportunity?
Will Jones 18Will Jones 18
I still haven't gotten the lookup field search working, but I was able to get the record to save successfully if I entered the exact name.

I changed this line of code from:
obj.Vendor_Event_Detail__c = VED.Id;

obj.Vendor_Event_Detail__c = VED.Vendor_Event_Detail__c;

Why is my lookup search not working at all?