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Sample calculator using Visualforce page and Apex in Salesforce

Sample code: Visualforce page: <apex:page controller="Sample"> <apex:form >     <apex:pageBlock > <apex:pageBlockSection > <apex:pageBlockSectionItem > <apex:outputLabel value="Value 1"/> </apex:pageBlockSectionItem> <apex:pageBlockSectionItem > <apex:inputText value="{!val1}"/> </apex:pageBlockSectionItem>                           <apex:pageBlockSectionItem > <apex:outputLabel value="Value 2"/> </apex:pageBlockSectionItem> ....

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How to use a list variable in SOQL?

Sample Code:     public List<String> ids = new List<String>{'003A0560014LLW9','a03A0000014LLWi','s03A000er14LLWq','a03A034d014LLWi','a03un000014LLWi','a03A0y00014LLW9','0019000000GuZEF'};         public List<Account> acc {get;set;}        public void find()    {                acc = Database.Query('Select Name, SLA__c From Account Where Id IN: ....

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Try and Catch in Apex

Sample Code: Visualforce page: <apex:page standardController="Account" extensions="sample">    <apex:form >                    <apex:pageMessages />        <apex:pageBlock >            <apex:pageBlockSection >                <apex:pageBlockSectionItem >                    Account Name:                   </apex:pageBlockSectionItem>                <apex:pageBlockSectionItem >                    <apex:inputField value="{!Account.Name}"/>                </apex:pageBlockSectionItem>            </apex:pageBlockSection>            <apex:pageblockButtons >                ....

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Rerender based on selectList option using Apex in Salesforce

Sample code:Visualforce page: <apex:page controller="sample" id="mypage">     <apex:form >                            <apex:selectList id="selected_list" value="{!temp}" required="false" size="1">             <apex:selectOption itemvalue="None" itemLabel="--None--"/>             <apex:selectOption itemvalue="a" itemLabel="a"/>             <apex:selectOption itemvalue="b" itemLabel="b"/>             <apex:actionSupport ....

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Date picker in Visualforce page

Sample Code1: Visualforce page: <apex:page docType="html-5.0" controller="Sample"> <apex:form > <apex:pageBlock > <apex:pageBlockSection> <apex:pageBlockSectionItem> Date: <apex:input type="date" value="{!dat}"/> </apex:pageBlockSectionItem> </apex:pageBlockSection> </apex:pageBlock> </apex:form> </apex:page> Apex Controller: public class Sample { public Date ....