remove leading spaces in JavaScript after retrieving data from database

Hey there, I need help with trimming the leading spaces using JavaScript when the value is fetched from a database. I am using JSP tags to retrieve the value and load it into an input field. The issue I'm facing is that if there are any spaces at the beginning of the value, nothing gets displayed in the input fields.

 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<script>
    function getValue() {
        <jsp:useBean id="ProjectBO"
    class="com.nousinfo.tutorial.employee.service.model.bo.EmployeeProjectBO"
    scope="request" />

        document.getElementById("empNumber").value = '<jsp:getProperty property="employeeNumber" name="ProjectBO"/>';



document.getElementById("projectCode").value = '<jsp:getProperty property="projectCode" name="ProjectBO"/>';
        document.getElementById("startDate").value = '<jsp:getProperty property="startDate" name="ProjectBO"/>';
        document.getElementById("endDate").value = '<jsp:getProperty property="endDate" name="ProjectBO"/>';
        document.getElementById("role").value = '<jsp:getProperty property="role" name="ProjectBO"/>';
    }
</script>
</head>
<body onload="getValue()">

    <form id="employee" action="ProjectUpdateServlet" method="post">

        <table width="1254" height="74" border="0" align="center">
            <tr>
                <td width="970" height="68" align="center" bgcolor="#99CCFF"><h2>
                        <span class="style1">Project Detail</span>
                    </h2></td>
                <td width="274" height="68" align="center" bgcolor="#FFFFFF"><img
                    src="/image/Emp.jpg" width="190" height="92" /></td>
            </tr>
        </table>
        <p>
            <br />
        </p>
        <hr size="1" width="786">
        <table width="786" border="0" align="center">
            <tr>
            <td><input type="hidden" name="updateStatusProject" value="M" /></td>

            </tr>
            <tr>

                <td width="298">Employee Number:</td>
                <td><input type="text" id="empNumber" name="employeeNumber" readonly="readonly" />
                </td>
            <tr>
                <td>Project_Code:</td>
                <td><input type="text" name="projectCode" id="projectCode"  readonly="readonly"/>
                </td>
            </tr>
            <tr>
                <td>Start_date</td>
                <td><input type="text" name="startDate" id="startDate" /></td>
            </tr>
            <tr>
                <td>End_date</td>
                <td><input type="text" name="endDate" id="endDate" /></td>
            </tr>
            <tr>
                <td>Role</td>
                <td><input type="text" name="role" id="role" /></td>
            </tr>
        </table>

        <p>&nbsp;</p>
        <br />
        <table width="200" border="0" align="center">
            <tr>

                <td><center>
                        <input type="submit" name="submit" value="Save" onclick="self.close()"/>

                    </center></td>

                <td><center>
                        <input type="button" name="cancle" value="Cancel"
                            onclick="self.close()">
                    </center></td>
            </tr>
        </table>
        <hr size="1" width="786">
        <p>&nbsp;</p>
    </form>
</body>
</html>

Answer ā„–1

String.prototype.trim = function() {
    return this.replace(/^\s+|\s+$/g,"");
}
String.prototype.ltrim = function() {
    return this.replace(/^\s+/,"");
}
String.prototype.rtrim = function() {
    return this.replace(/\s+$/,"");
}

// demonstrating the usage of trim, ltrim, and rtrim
var exampleString = " hey there, how are you ";
alert("*"+exampleString.trim()+"*");
alert("*"+exampleString.ltrim()+"*");
alert("*"+exampleString.rtrim()+"*");

Answer ā„–2

In JavaScript, the replace method allows you to use a regular expression as the search term. For example, if you need to delete leading spaces from a string:

str = str.replace(/^\s+/, '');

Here, the ^ denotes the "start of input", \s represents any whitespace character, and + indicates one or more occurrences of the previous pattern. Therefore, this regex matches "Whitespace characters at the beginning of the input," which are then replaced by an empty string.

If your goal is to eliminate trailing spaces instead of leading ones, you would modify the regex with $ at the end (where $ signifies "end of input"):

str = str.replace(/\s+$/, '');

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