javascript - Don't submit unless all data is entered -
i have function registration page if data required isn't entered user alerts user fill in. form still submits information though not sure i'm doing wrong. want not submit until data submitted , correct.
function checkdetails() { if (document.form1.txtname.value == "") {alert("please fiill in forename."); } if (document.form1.txtsurname.value == "") {alert("please fill in surname."); } if (document.form1.txtusername == "") {alert("please create username."); } if (document.form1.dobday.selectedindex == 0) {alert("please select day born."); } if (document.form1.dobmonth.selectedindex == 0) { alert("please select month born"); } if (document.form1.dobyear.selectedindex == 0) {alert("please fill in year born."); } if (document.form1.txtemail.value == "") {alert("please enter e-mail address."); } if (document.form1.terms.checked == false) {alert("please tick have read terms , conditions."); } } <form action="home.html" method="post" name="form1" onsubmit="display()"> <table bgcolor="white" width="700" border="0" align="center"> <col width="200"> <col width="200"> <tr> <th colspan = "2" align = "center" bgcolor="grey"> fill form sign up. </th> </tr> <tr> <td> </td> </tr> <tr> <td colspan="2" style="font-size:12px">fields marked * mandatory</td> </tr> <tr> <td> </td> </tr> <tr> <td>forename*</td> <td>surname*</td> </tr> <tr> <td><label> <input type="text" name="txtname" id="txtname" class="info" /> <td><label> <input type="text" name="txtsurname" id="txtsurname" class="info" /> </label></td> </tr> <tr> <td> create username*</td> <td> birthday</td> </tr> <tr> <td><label> <input type="text" name="txtusername" id="txtusername" class="info"/> </label></td> <td><select name="dobmonth"> <option> month </option> <option value="january">january</option> <option value="febuary">febuary</option> <option value="march">march</option> <option value="april">april</option> <option value="may">may</option> <option value="june">june</option> <option value="july">july</option> <option value="august">august</option> <option value="september">september</option> <option value="october">october</option> <option value="november">november</option> <option value="december">december</option> </select> <select name="dobday"> <option> day </option> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> <option value="6">6</option> <option value="7">7</option> <option value="8">8</option> <option value="9">9</option> <option value="10">10</option> <option value="11">11</option> <option value="12">12</option> <option value="13">13</option> <option value="14">14</option> <option value="15">15</option> <option value="16">16</option> <option value="17">17</option> <option value="18">18</option> <option value="19">19</option> <option value="20">20</option> <option value="21">21</option> <option value="22">22</option> <option value="23">23</option> <option value="24">24</option> <option value="25">25</option> <option value="26">26</option> <option value="27">27</option> <option value="28">28</option> <option value="29">29</option> <option value="30">30</option> <option value="31">31</option> </select> <select name="dobyear"> <option> year </option> <option value="2016">2016</option> <option value="2015">2015</option> <option value="2014">2014</option> <option value="2013">2013</option> <option value="2012">2012</option> <option value="2011">2011</option> <option value="2010">2010</option> <option value="2009">2009</option> <option value="2008">2008</option> <option value="2007">2007</option> <option value="2006">2006</option> <option value="2005">2005</option> <option value="2004">2004</option> <option value="2003">2003</option> <option value="2002">2002</option> <option value="2001">2001</option> <option value="2000">2000</option> <option value="1999">1998</option> <option value="1998">1998</option> <option value="1997">1997</option> <option value="1996">1996</option> <option value="1995">1995</option> <option value="1994">1994</option> <option value="1993">1993</option> <option value="1992">1992</option> <option value="1991">1991</option> <option value="1990">1990</option> <option value="1989">1989</option> <option value="1988">1988</option> <option value="1987">1987</option> <option value="1986">1986</option> <option value="1985">1985</option> <option value="1984">1984</option> <option value="1983">1983</option> <option value="1982">1982</option> <option value="1981">1981</option> <option value="1980">1980</option> <option value="1979">1979</option> <option value="1978">1978</option> <option value="1977">1977</option> <option value="1976">1976</option> <option value="1975">1975</option> <option value="1974">1974</option> <option value="1973">1973</option> <option value="1972">1972</option> <option value="1971">1971</option> <option value="1970">1970</option> <option value="1969">1969</option> <option value="1968">1968</option> <option value="1967">1967</option> <option value="1966">1966</option> <option value="1965">1965</option> <option value="1964">1964</option> <option value="1963">1963</option> <option value="1962">1962</option> <option value="1961">1961</option> <option value="1960">1960</option> <option value="1959">1959</option> <option value="1958">1958</option> <option value="1957">1957</option> <option value="1956">1956</option> <option value="1955">1955</option> <option value="1954">1954</option> <option value="1953">1953</option> <option value="1952">1952</option> <option value="1951">1951</option> <option value="1950">1950</option> <option value="1949">1949</option> <option value="1948">1948</option> <option value="1947">1947</option> </select> <tr> <td>email*</td> <td>confirm email*</td> </tr> <tr> <td><label> <input type="text" name="txtemail" id="txtemail" class="info" onchange="validateemail(txtemail)" /> <td><label> <input type="text" name="txtemail2" id="txtemail2" class="info" onchange="validateemail2(txtemail2)"/> </label></td> </tr> <tr> <td>password*</td> <td>confirm pasword*</td> </tr> <tr> <td><label> <input type="password" name="txtpassword" id="txtpassword" class="info"/> <td><label> <input type="password" name="txtpassword2" id="txtpassword2" class="info"/> </label></td> </tr> <td colspan="2" style="font-size:12px">**passwords must @ least 8 characters in lenght.</td> </tr> <tr> <td> </td> </tr> <tr> <td colspan="2"> <label> <input type="checkbox" name="terms" value="terms" id="terms" /> agree terms , conditions</label> </td></tr> <br><br><br> <tr> <td colspan="2"><label> <input type="checkbox" name="notify" value="notify" id="notify" /> want receive notifications text/email new products in stock.</label> </td> </tr> <tr> <td> </td> </tr> <tr> <td><label> <input type="submit" name="login" id="login" value="login" onclick="checkdetails()" /> </label></td> <td><label> <input type="reset" name="reset" id="reset" value="reset" /> </label></td> </tr> <tr> <td> </td> </tr> </table> </form>
it's better use html5 attribute required !
<input type="text" name="input" required > 
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