Form Validation

Dear,

I have used a submit button to post variable from one to another page. But the form accepting null values and spaces. Kindly, help me with this problem.

Please find the code below.

<!--

<form class=" bd-form-9 bd-background-width "
action="https://www.secureserver.net/domains/search.aspx?checkAvail=1&amp;prog_id=522973&quot;
name="form-name" method="post">

<div class="bd-container-inner">
    <div class="container-fluid">
        <div class=" bd-input-31 form-group">
<label class="bd-form-label"

for="domainToCheck">Find Your Perfect Domain

<input type="text"

id="domainToCheck" class="bd-form-input"
placeholder="Search for a new domain"
name="domainToCheck" >

    <a 

name="Search"
onclick="jQuery(this).closest('form').submit();" href="#" class="bd-linkbutton-18 bd-button-35 bd-content-element" >

SEARCH DOMAIN

--!>