javascript - HTML checkbox validation breaks when there are multiple checkboxes in the form -


in form below, how ignore disabled checkbox. expected behavior in form if user not check model check box , click on submit button, form should submitted. if model checkbox checked, user must enter data. behavior works long there no other checkbox on page. if there checkbox, , submit button clicked without checking model checkbox, alert thrown. how can ignore other checkboxes in form achieve desired behavior? thanks!

$(document).ready(function () {      $('#checkmodelbtn').click(function() {        var ischeckboxchecked = $("input[type=checkbox]:checked").length;        var istextentered = $("input.childmodel").val().length;                if ( istextentered || !ischeckboxchecked ) {            //alert("validation passed!");        } else {            alert("please enter model number");        }        });    });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>    <table>  <tr>  <td>  <p><h2>model:</h2></p>  <input type="checkbox"> model #  <input type="text" size="12" class="childmodel"><br>  </td>    <td>  checkbox breaks functionality<p>  <input type="checkbox" checked disabled> text here</td>  </tr>  </table>    <hr>  <input type="submit" name="submit" value="submit" id="checkmodelbtn"/>

to ignore checkbox don't want validate need way ignore in validation, , can using input field. change selector checkbox $("input[type=checkbox]:checked") $(".childmodel").prev("input[type=checkbox]:checked")

example:

$(document).ready(function() {    $('#checkmodelbtn').click(function() {      var ischeckboxchecked = $(".childmodel").prev("input[type=checkbox]:checked").length;      var istextentered = $("input.childmodel").val().length;        if (istextentered || !ischeckboxchecked) {        //alert("validation passed!");      } else {        alert("please enter model number");      }      });  });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>    <table>    <tr>      <td>        <p>          <h2>model:</h2>        </p>        <input type="checkbox"> model #        <input type="text" size="12" class="childmodel">        <br>      </td>        <td>        checkbox breaks functionality        <p>          <input type="checkbox" checked disabled> text here</td>    </tr>  </table>    <hr>  <input type="submit" name="submit" value="submit" id="checkmodelbtn" />


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