I have constrains to validate mobile phone number. 

It working fine with the form.   

If I need to show the same ValidateError message to website form.

How to do it? 

i appreciate your help.

            <section id="forms">
                <form action="/website_form/" method="post" class="s_website_form form-horizontal container-fluid mt32" enctype="multipart/form-data" data-model_name="hr.applicant" data-success_page="/job-thank-you" t-att-data-form_field_department_id="job and job.department_id.id or False" t-att-data-form_field_job_id="job and job.id or False">
                    <div class="form-group form-field o_website_form_required_custom">
                        <div class="col-md-3 col-sm-4 text-right">
                            <label class="control-label" for="partner_name">Name</label>
                        </div>
                        <div class="col-md-7 col-sm-8">
                            <input type="text" class="form-control o_website_form_input" name="partner_name" required=""/>
                        </div>
                    </div>
                    <div class="form-group form-field o_website_form_required_custom">
                        <div class="col-md-3 col-sm-4 text-right">
                            <label class="control-label" for="partner_mobile">Mobile Phone</label>
                        </div>
                        <div class="col-md-7 col-sm-8">
                            <input type="text" class="form-control o_website_form_input" name="partner_mobile" required=""/>
                        </div>
                    </div>
                    <div class="form-group form-field o_website_form_required_custom">
                        <div class="col-md-3 col-sm-4 text-right">
                            <label class="control-label" for="email_from">Email</label>
                        </div>
                        <div class="col-md-7 col-sm-8">
                            <input type="email" class="form-control o_website_form_input" name="email_from" required=""/>
                        </div>
                    </div>
                    <div class="form-group form-field">
                        <div class="col-md-3 col-sm-4 text-right">
                            <label class="control-label" for="description">Short Description</label>
                        </div>
                        <div class="col-md-7 col-sm-8">
                            <textarea class="form-control o_website_form_input" name="description"></textarea>
                        </div>
                    </div>
                    <div class="form-group form-field o_website_form_custom">
                      <div class="col-md-3 col-sm-4 text-right">
                        <label class="control-label" for="Resume">Resume</label>
                      </div>
                      <div class="col-md-7 col-sm-8">
                        <input type="file" class="form-control o_website_form_input" name="Resume"/>
                      </div>
                    </div>
                    <div class="form-group">
                        <div class="col-md-offset-3 col-sm-offset-4 col-sm-8 col-md-7">
                            <span class="btn btn-primary btn-lg o_website_form_send">Submit</span>
                            <span id="o_website_form_result"></span>
                        </div>
                    </div>
                </form>
</section>

@api.one
@api.constrains('partner_mobile')
def _check_partner_mobile(self):
    pattern = re.compile("^[0]{1}[0-9]{9}$")
    if not bool(pattern.match(self.partner_mobile)):
        raise ValidationError(_('Invalid mobile phone number!.'))