Apex Archives - Page 4 of 4

URL Parameters within Apex and Visualforce

28 Sep

Get a URL parameter from a Visualforce page


String MyParameter = ApexPages.currentPage().getParameters().get('urlparm');

String MyParameter = ApexPages.currentPage().getParameters().get('urlparm');

Get a map of URL parameters from a Visualforce page


Map<String, String> UrlParameterMap = ApexPages.currentPage().getParameters();
// check for a specific parameter
if (UrlParameterMap.containsKey('urlparm')){
  //do something with the parameter... UrlParameterMap.get('urlparm')
}

Map<String, String> UrlParameterMap = ApexPages.currentPage().getParameters();

// check for a specific parameter

if (UrlParameterMap.containsKey('urlparm')){

//do something with the parameter... UrlParameterMap.get('urlparm')

}

Get URL Parameters in a Visualforce page

This assumes the URL is looks like this, “http://www.salesforce.com/apex/MyPage?urlparm=something”.


<apex:outputText value="{!$CurrentPage.parameters.urlparm}" />

<apex:outputText value="{!$CurrentPage.parameters.urlparm}" />

Put values into Visualforce page’s URL and load a new page

Method 1: write out the URL


public PageReference MyPageMethod() {
  String MyParameter = 'something';

  // redirect to a Visualforce page containing a url parm
  PageReference MyNewPage = new PageReference('/apex/newvfpage?urlparm=' + MyParameter);    
  // -or- redirect to a records page
  PageReference MyNewPage = new PageReference('/' + MyObj.Id);

  MyNewPage.setRedirect(true);
  return MyNewPage;
}

public PageReference MyPageMethod() {

String MyParameter = 'something';

// redirect to a Visualforce page containing a url parm

PageReference MyNewPage = new PageReference('/apex/newvfpage?urlparm=' + MyParameter);

// -or- redirect to a records page

PageReference MyNewPage = new PageReference('/' + MyObj.Id);

MyNewPage.setRedirect(true);

return MyNewPage;

}

Method 2: Put parameters into a PageReference


public PageReference MyPageMethod() {
  String MyParameter = 'something';

  PageReference MyNewPage = Page.PageTwo;
  MyNewPage.getParameters().put('urlparm',MyParameter);

  MyNewPage.setRedirect(true);
  return MyNewPage;
}

public PageReference MyPageMethod() {

String MyParameter = 'something';

PageReference MyNewPage = Page.PageTwo;

MyNewPage.getParameters().put('urlparm',MyParameter);

MyNewPage.setRedirect(true);

return MyNewPage;

}

Put values into the current test page’s URL in a Test Class


@isTest
private class MyControllerTest {
  static testMethod void myUnitTest() {
    // create a new page reference, set it as the current page, 
    // and use the ApexPages.currentPage() method to put the values
    PageReference PageRef = Page.MyPage;
    Test.setCurrentPage(PageRef);
    ApexPages.currentPage().getParameters().put('urlparm', 'theValue');      

    // load the controller and proceed with testing
    MyController controller = new MyController();
  }
}

@isTest

private class MyControllerTest {

static testMethod void myUnitTest() {

// create a new page reference, set it as the current page,

// and use the ApexPages.currentPage() method to put the values

PageReference PageRef = Page.MyPage;

Test.setCurrentPage(PageRef);

ApexPages.currentPage().getParameters().put('urlparm', 'theValue');

// load the controller and proceed with testing

MyController controller = new MyController();

}

Salesforce Help

$CurrentPage Documentation
Controller Navigation Methods
Visualforce Parameters

Apex Loops, The Simple Things

18 Sep

For loop over a map’s keys (KeySet)


map<String, CustomObject__c> MyAwesomeMap;
//... other code
for (String KeyStr: MyAwesomeMap.keySet()){
  system.debug(KeyStr);
}

map<String, CustomObject__c> MyAwesomeMap;

//... other code

for (String KeyStr: MyAwesomeMap.keySet()){

system.debug(KeyStr);

}

For loop over a map’s values


map<String, CustomObject__c> MyAwesomeMap;
//... other code
for (CustomObject__c AnObject: MyAwesomeMap.values()){
  system.debug(AnObject);
}

map<String, CustomObject__c> MyAwesomeMap;

//... other code

for (CustomObject__c AnObject: MyAwesomeMap.values()){

system.debug(AnObject);

}

For loop over a list


list<CustomObject__c> MyAwesomeList;
//... other code
for (CustomObject__c AnObject: MyAwesomeList){
  system.debug(AnObject);
}

list<CustomObject__c> MyAwesomeList;

//... other code

for (CustomObject__c AnObject: MyAwesomeList){

system.debug(AnObject);

}

For loop over a set


set<CustomObject__c> MyAwesomeSet;
//... other code
for (CustomObject__c AnObject: MyAwesomeSet){
  system.debug(AnObject);
}

set<CustomObject__c> MyAwesomeSet;

//... other code

for (CustomObject__c AnObject: MyAwesomeSet){

system.debug(AnObject);

}

Code Snipits for Converting Salesforce Collections

8 Sep

Convert a Map to a List of keys


Map<Id, CustomObject__c> MyMap = new Map<Id, CustomObject__c>();
List<Id> IdList = new List<Id>();
// ... logic to load map ...
IdList.addAll(MyMap.keySet());

Map<Id, CustomObject__c> MyMap = new Map<Id, CustomObject__c>();

List<Id> IdList = new List<Id>();

// ... logic to load map ...

IdList.addAll(MyMap.keySet());

Convert a Map Values to a List of values


Map<Id, CustomObject__c> MyMap = new Map<Id, CustomObject__c>();
List<CustomObject__c> CustomObjectList = new List<CustomObject__c>();
// ... logic to load map ...
CustomObjectList.addAll(MyMap.values());

Map<Id, CustomObject__c> MyMap = new Map<Id, CustomObject__c>();

List<CustomObject__c> CustomObjectList = new List<CustomObject__c>();

// ... logic to load map ...

CustomObjectList.addAll(MyMap.values());

Convert an sObject List to a Map – Example 1 – New map with the List passed into the map’s constructor

Use this method when the map’s key value is the object’s Id. Thanks to this post for explaining the concept: King Koo


List<CustomObject__c> MyList = new List<CustomObject__c>();
// ... logic to load list ...
Map<Id, CustomObject__c> MyMap = new Map<Id, CustomObject__c>(MyList);

List<CustomObject__c> MyList = new List<CustomObject__c>();

// ... logic to load list ...

Map<Id, CustomObject__c> MyMap = new Map<Id, CustomObject__c>(MyList);

Convert an sObject List to a Map – Example 2 – Loop and Add

Use this method when the map’s key must be a field that is not an object’s id. This is useful when you need to find an object with a name instead of an Id value.


List<CustomObject__c> MyList = new List<CustomObject__c>();
Map<String, CustomObject__c> MyMap = new Map<String, CustomObject__c>();
// ... logic to load list ...
for(CustomObject__c c : MyList) {
  MyMap.put(c.Name, c);
}

List<CustomObject__c> MyList = new List<CustomObject__c>();

Map<String, CustomObject__c> MyMap = new Map<String, CustomObject__c>();

// ... logic to load list ...

for(CustomObject__c c : MyList) {

MyMap.put(c.Name, c);

}