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What are the Ajax functions why we use them in salesforce?

Chris Normand

AJAX Components are used to dynamically replace the content of a panel tag within a page without replacing the page in the browser window. These tags allow a more seamless, flicker-free user interface.

What is AJAX request in Salesforce?

A component that adds AJAX support to another component, allowing the component to be refreshed asynchronously by the server when a particular event occurs, such as a button click or mouseover. apex:actionStatus.

What is action function Salesforce?

Action Function is used in the Visualforce page to call the Service Side method using JavaScript and does not add the Ajax Request before calling the Controller method.

How can we implement pagination in visualforce?

There are two options for pagination in Visualforce pages. OFFSET pagination, and StandardSetController pagination. With OFFSET pagination you are limited to 2,000 records; however, with a StandardSetController you can paginate up to 10,000 records.

How do I use action function in Visualforce page?

In this blog we will learn about <apex:actionFunction> tag. This tag is used to invoke Apex action by using JavaScript asynchronously via AJAX requests. JavaScript is Dynamic scripting language which perform action on client side.

What is AJAX in salesforce?

What is AJAX? As many of you already know that the AJAX stands for the “Asynchronous javascript and XML“. AJAX is the art of exchanging data between server and client without reloading the complete web page. Visualforce has inbuilt support for the AJAX.

How do I create a checkbox in Visualforce page?

Create a new visualforce page.
  1. Click on Create page apexcheckbox link as shown below.
  2. Now check the code below.
  3. In this salesforce developer training tutorial we are creating pageblock table for standard object opportunity. …
  4. we can mark checkboxes for the required opportunities and Save them.
Create a new visualforce page.
  1. Click on Create page apexcheckbox link as shown below.
  2. Now check the code below.
  3. In this salesforce developer training tutorial we are creating pageblock table for standard object opportunity. …
  4. we can mark checkboxes for the required opportunities and Save them.

What is the difference between a standard controller and a custom controller?

Custom controllers are written by you and do what your code tells them to do. StandardController: for that we can implement Standard functionalities (save, quickSave, edit, delete,cancel), and passing recordID through Addressbar we can display the Record On VF-Page.

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What is offset in SOQL?

When expecting many records in a query’s results, you can display the results in multiple pages by using the OFFSET clause on a SOQL query. For example, you can use OFFSET to display records 51–75 and then jump to displaying records 301–350. Using OFFSET is an efficient way to handle large results sets.

What are the AJAX functions why we use them in Salesforce?

AJAX Components are used to dynamically replace the content of a panel tag within a page without replacing the page in the browser window.

How do you call a controller method from JavaScript in Salesforce?

1 Answer
  1. OrderPadController.openPage(function(result, event){ console.log(result);
  2. window.open(result,”_self”); });
  3. }); </script>
  4. // @remoteAction.
1 Answer
  1. OrderPadController.openPage(function(result, event){ console.log(result);
  2. window.open(result,”_self”); });
  3. }); </script>
  4. // @remoteAction.

How do you call an Apex class from a custom button in Salesforce?

To call an Apex class from custom button or link on the object detail page, create a VisualForce page and call the Apex class method via the action attribute to make it work. Following is some sample code showing how to do that. The action method invoked when this page is requested by the server.

How do I make a checkbox in HTML?

The <input type=”checkbox”> defines a checkbox. The checkbox is shown as a square box that is ticked (checked) when activated. Checkboxes are used to let a user select one or more options of a limited number of choices. Tip: Always add the <label> tag for best accessibility practices!

What is the difference between system mode and user mode?

What is System Mode? System mode means running apex code by ignoring user’s permissions. User mode means running apex code by respecting user’s permissions and sharing of records. System mode is trusted, admin-vetted logic run with extra rights.

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How do I make my own controller?

Create a Custom Controller Apex Class

Open the Developer Console and click File | New | Apex Class to create a new Apex class. Enter ContactsListWithController for the class name. In the editor, replace any code with the following. As with Visualforce pages, you need to save your changes to Apex when you change it.

How do I set limits in SOQL query?

The syntax for LIMIT is:
  1. SELECT fieldList FROM objectType [WHERE conditionExpression] [LIMIT numberOfRows]
  2. SELECT Name FROM Account WHERE Industry = ‘Media’ LIMIT 125.
  3. SELECT MAX(CreatedDate) FROM Account LIMIT 1.
The syntax for LIMIT is:
  1. SELECT fieldList FROM objectType [WHERE conditionExpression] [LIMIT numberOfRows]
  2. SELECT Name FROM Account WHERE Industry = ‘Media’ LIMIT 125.
  3. SELECT MAX(CreatedDate) FROM Account LIMIT 1.

How do I create a dynamic SOQL query in Salesforce?

Dynamic SOQL refers to the creation of a SOQL string at run time with Apex code. Dynamic SOQL enables you to create more flexible applications. For example, you can create a search based on input from an end user or update records with varying field names. To create a dynamic SOQL query at run time, use the Database.

How do you call an Apex class from a lightning component?

Using Wire method:

To call the apex method in the lightning web component, First, we have to create the apex class and add the @AuraEnabled method at the first line, i.e., before starting the method. To call it from Wire Service, the method should be cacheable. Hence, add cacheable=true in @AuraEnabled.

How do you use Apex inside aura?

Aura: How to call an Apex method from Lightning javascript…
  1. Create the Apex class. Note the following pointers. The method to be executed from your lightning component has to be annotated with @AuraEnabled. …
  2. Declare your apex class in your lightning component.
  3. Call your apex method from your Javascript.
Aura: How to call an Apex method from Lightning javascript…
  1. Create the Apex class. Note the following pointers. The method to be executed from your lightning component has to be annotated with @AuraEnabled. …
  2. Declare your apex class in your lightning component.
  3. Call your apex method from your Javascript.

How do you call a controller method from JavaScript in VisualForce page?

1 Answer
  1. OrderPadController.openPage(function(result, event){ console.log(result);
  2. window.open(result,”_self”); });
  3. }); </script>
  4. // @remoteAction.
1 Answer
  1. OrderPadController.openPage(function(result, event){ console.log(result);
  2. window.open(result,”_self”); });
  3. }); </script>
  4. // @remoteAction.

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