[SalesForce] Visualforce : Lookup field Event

I have a lookup field declared as below:

<apex:inputfield value="{!Product2.Opportunity__c}" id="prodoppr"/>

wish to know how to add or handle event for this lookup field? When there is a change in the value I want to trigger method to perform certain validation and upate other fields….how can i achieve this? please any inputs?

Best Answer

You can use apex:actionSupport to listen for changes and respond accordingly. For example:

<apex:inputfield value="{!Product2.Opportunity__c}" id="prodoppr">
    <apex:actionsupport event="onchange" action="{!validateandupdate}" reRender="form" />
</apex:inputfield>

If you want to do client-side validation, you can also use apex:inputField's onchange attribute to support listening for changes to the lookup field.

Edit: The action attribute is used to determine the function to call. So, in this example, the function is named validateAndUpdate, which would look like this:

public void validateAndUpdate() {
    if(...) { // Some validations
        ApexPages.addMessage(...);
    } else {
        update someRecords;
    }
}

Appropriate error handling should also be part of such a function to avoid partial transactions by way of Database.setSavePoint and Database.rollback.

Related Solutions

[SalesForce] ActionSupport with lookup field: is ActionRegion required

I want to avoid using ActionRegion because it forces the user to enter data in required fields in other parts of the page form.

One of the main uses of the apex:actionRegion tag is to do the opposite of this, by sending only the elements that are children of the actionRegion with the request to the server. The visualforce parser will only enforce required validations on fields that are included in the request, and thus you can strategically place an actionRegion to get around unwanted validation.

In this case of the code in your question, the apex:actionRegion tag is just wrapping the wrong elements. Change it so the actionRegion only wraps the inputField.

<apex:actionRegion>
     <apex:inputField value="{!contact.AccountId}">
        <apex:actionSupport event="onchange" action="{!AccountPopulated}" rerender="accinfo, msgs"/> 
     </apex:inputField>
</apex:actionRegion>

[SalesForce] Create VisualForce input that uses Lookup popup

Per Jeff Douglas's ROLL YOUR OWN SALESFORCE "LOOKUP" POPUP WINDOW blog post, one way to do this is to simply create a dummy instance of an object that has a relationship with the one you want to perform a lookup on, and then use the appropriate property of that instance as the value of an inputField.

From his post:

MyCustomLookupController

Here's the Apex controller for the record you are either creating or editing. This is an extremely simple controller that just creates a new contact so you can use the lookup for the related account field.
public with sharing class MyCustomLookupController {

  public Contact contact {get;set;}

  public MyCustomLookupController() {
    contact = new Contact();
  }

}
MyCustomLookup

[ ... lots of code omitted; see the original post for full content ... ]
<apex:inputField id="Account" value="{!contact.AccountId}"/>

This is an ugly, hacky solution, and I'd hoped to find something cleaner, but it works. It'd be even uglier if you didn't already have an object with a field of the right type; in that case, I guess you could create a custom object whose entire purpose was to be used for this hack.

Best Answer

Related Solutions

[SalesForce] ActionSupport with lookup field: is ActionRegion required

[SalesForce] Create VisualForce input that uses Lookup popup

MyCustomLookupController

MyCustomLookup

Related Topic