How to make a Search Bar using Javascript in Salesforce?

Hi Manpreet,

you can try something like this

Page

<apex:page controller="SearchJavascriptController">
<html>
<head>
<style>

* {
box-sizing: border-box;
}

#myInput {
background-image: url('/css/searchicon.png');
background-position: 10px 10px;
background-repeat: no-repeat;
width: 100%;
font-size: 16px;
padding: 12px 20px 12px 40px;
border: 1px solid #ddd;
margin-bottom: 12px;
}

#myTable {
border-collapse: collapse;
width: 100%;
border: 1px solid #ddd;
font-size: 18px;
}

#myTable th, #myTable td {
text-align: left;
padding: 12px;
}

#myTable tr {
border-bottom: 1px solid #ddd;
}

#myTable tr.header, #myTable tr:hover {
background-color: #f1f1f1;
}
</style>
</head>
<body>

<apex:form id="theForm">
<apex:pageBlock >
<h2>My Account</h2>
<input type="text" id="myInput" onkeyup="myFunction()" placeholder="Search for names.." title="Type in a name">
</input>
</apex:pageBlock>
<table id="myTable">
<tr>
<th><h1> ACCOUNT NAME</h1></th>
<th><h1> ACCOUNT ID</h1></th>
<th><h1>ANNUAL REVENUE</h1></th>
</tr>
<apex:repeat value="{!accountList}" var="acc" id="theRepeat">
<tr>
<td>{!acc.name}</td>
<td>{!acc.id}</td>
<td>{!acc.AnnualRevenue}</td>
</tr>
</apex:repeat>
</table>
<script>
function myFunction() {
var input, filter, table, tr, td, i;
input = document.getElementById("myInput");
console.log(input);
filter = input.value.toUpperCase();

table = document.getElementById("myTable");
tr = table.getElementsByTagName("tr");
for (i = 0; i < tr.length; i++) {
td = tr[i].getElementsByTagName("td")[0];
if (td) {
if (td.innerHTML.toUpperCase().indexOf(filter) > -1) {

tr[i].style.display = "";
} else {
tr[i].style.display = "none";
}
}
}
}
</script>
</apex:form>
</body>
</html>

</apex:page>

Controller

public with sharing class SearchJavascriptController {

public list<Account>accountlist { get; set; }
public SearchJavascriptController()
{
accountList = new list<Account>();
accountList =[Select Name,Id,AnnualRevenue From Account];
}

}

thanks