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What does a wrapper class do in Salesforce?
A wrapper or container class is a class, data structure, or an abstract data type whose instances are a collections of other objects.It is a custom object defined by Salesforce developer where he defines the properties of the wrapper class.
Which is an example of a wrapper class?
This is a practical example of when you would utilize a wrapper class in your code. The wrapper will literally allow us to combine the Account records and this arbitrary counter variable together so that we can utilize both objects in the page.
How to make the navigation bar responsive in CSS?
The w3-mobile class makes any bar elements responsive (horizontal on large screens and vertical on small). Use a w3-color class to add a color to the navigation bar: Use a w3-border or w3-card class to add borders around the navigation bar, or to display it as a card:
Basic Navigation. The w3-bar class is a container for displaying HTML elements horizontally. The w3-bar-item class defines the container elements. It is a perfect tool for creating navigation bars: Home Link 1 Link 2 Link 3. Example. . Home .
A wrapper class is a custom object defined by programmer wherein he defines the wrapper class properties. Consider a custom object in salesforce, what do you have in it? fields right? different fields of different data types.
We can wrap different objects types or any other types in a wrapper class. In the Visualforce most important use case is to display a table of records with a check box and then process only the records that are selected. In the example below, we are displaying list of accounts with checkbox.
Is there way to perform bulk DML operations?
Bulk DML You can perform DML operations either on a single sObject, or in bulk on a list of sObjects. Performing bulk DML operations is the recommended way because it helps avoid hitting governor limits, such as the DML limit of 150 statements per Apex transaction.
How to manipulate Contact Records with DML unit?
This example uses the Email field on Contact because it has idLookup property set. The example inserts the Jane Smith contact, and creates a second Contact sObject, populates it with the same email, then calls upsert to update the contact by using the email field for matching.