Simple Search using Visualforce and Apex in Salesforce?

Simple Search using Visualforce and Apex in Salesforce?

Sample Code:

Visualforce page:

<apex:page controller="Sample" tabStyle="Account">
    <apex:actionstatus id="actStatus">
        <apex:facet name="start">
            <div class="waitingSearchDiv" id="el_loading" style="background-color: #fbfbfb; height:100%;opacity:0.65;width:100%;">
                <div class="waitingHolder" style="top: 100px; width: 91px;">
                <img class="waitingImage" src="/img/loading.gif" title="Please Wait..." />
                <span class="waitingDescription">Loading...</span>
                </div>
            </div>
        </apex:facet>
    </apex:actionstatus>
<apex:form >
<apex:pageMessages />
    <apex:pageBlock id="pg">
        <apex:pageBlockSection >
            <apex:panelGrid columns="3" cellpadding="3" cellspacing="3">
                <apex:outputLabel value="Account Name: "/>
                <apex:inputText value="{!acctName}"/>
                <apex:commandButton value="Go" action="{!searchAcct}" status="actStatus" reRender="pg"/>
            </apex:panelGrid> 
        </apex:pageBlockSection>
        <apex:pageBlockSection rendered="{!listAcctOptions.Size > 0}" title="Account Selection">
            <apex:panelGrid columns="2">
                <apex:outputLabel value="Select Account: "/>
                <apex:selectList value="{!selectedAcctId}" size="1">
                    <apex:selectOptions value="{!listAcctOptions}"/>
                    <apex:actionSupport action="{!fetchRecords}" event="onchange" status="actStatus" reRender="pg"/>
                </apex:selectList>
            </apex:panelGrid>
        </apex:pageBlockSection>        
        <apex:pageBlockSection rendered="{!listContacts.Size > 0}" title="Contacts">
            <apex:pageBlockTable value="{!listContacts}" var="con">
                <apex:column >
                    <apex:outputLink target="_blank" value="/{!con.Id}">{!con.Name}</apex:outputLink>
                </apex:column>
            </apex:pageBlockTable>
        </apex:pageBlockSection>
        <apex:pageBlockSection rendered="{!listOpptys.Size > 0}" title="Opportunities">
            <apex:pageBlockTable value="{!listOpptys}" var="oppty">
                <apex:column >
                    <apex:outputLink target="_blank" value="/{!oppty.Id}">{!oppty.Name}</apex:outputLink>
                </apex:column>
            </apex:pageBlockTable>
        </apex:pageBlockSection>
        <apex:pageBlockSection rendered="{!listCases.Size > 0}" title="Cases">
            <apex:pageBlockTable value="{!listCases}" var="cas">
                <apex:column >
                    <apex:outputLink target="_blank" value="/{!cas.Id}">{!cas.CaseNumber}</apex:outputLink>
                </apex:column>
            </apex:pageBlockTable>
        </apex:pageBlockSection>
    </apex:pageBlock>
</apex:form>

</apex:page>

Apex Controller:

public class Sample {
    public String acctName {get;set;}
    public List<SelectOption> listAcctOptions {get;set;}
    public List<Contact> listContacts {get;set;}
    public List<Case> listCases {get;set;}
    public List<Opportunity> listOpptys {get;set;}
    public String acctId {get;set;}
    public String selectedAcctId {get;set;}
    
    public Sample() {
        listAcctOptions = new List<SelectOption>();
        listContacts = new List<Contact>();
        listCases = new List<Case>();
        listOpptys = new List<Opportunity>();
    }
    
    public void searchAcct() {
        String soql = 'SELECT Id, Name FROM Account WHERE Name LIKE \'' + acctName + '%\' LIMIT 999';
        List<Account> listAcct = Database.query(soql);
        system.debug('Test ' + listAcct);
        if(listAcct.size() > 0) {
            listAcctOptions = new List<SelectOption>();
            listAcctOptions.add(new SelectOption('none', '-----------None-----------'));
            for(Account a : listAcct) {
                listAcctOptions.add(new SelectOption(a.Id, a.Name));
            }
        }
    }
    
    public void fetchRecords() {
        if(selectedAcctId != 'none') {
            listOpptys = [SELECT Id, Name FROM Opportunity WHERE AccountId =: selectedAcctId];
            listContacts = [SELECT Id, Name FROM Contact WHERE AccountId =: selectedAcctId];
            listCases = [SELECT Id, CaseNumber FROM Case WHERE AccountId =: selectedAcctId];
        } else {
            ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR,'Select an Account to fetch their records'));
        }
    }
}

Output: