const form = document.getelementbyid('form');
const corporate = document.getelementbyid('title');
const username = document.getelementbyid('name');
const contact_type = document.getelementbyid('contact_type');
const phone = document.getelementbyid('contact');
const message = document.getelementbyid('content');
const yzm = document.getelementbyid('captcha');

form.addeventlistener('submit', e => {
    e.preventdefault();
    if (checkinputs()){
        form.submit();
    }
});

function checkinputs() {
    const corporatevalue = corporate.value.trim();
    const usernamevalue = username.value.trim();
    const contact_typevalue = contact_type.value.trim();
    const phonevalue = phone.value.trim();
    const messagevalue = message.value.trim();
    const yzmvalue = yzm.value.trim();
    
    if(corporatevalue === '') {
        seterrorfor(corporate, '公司名称/标题不能为空');
        return false;
    } else {
        setsuccessfor(corporate);
    }

    if(usernamevalue === '') {
        seterrorfor(username, '联系人不能为空');
        return false;
    } else {
        setsuccessfor(username);
    }

    if(contact_typevalue === '') {
        seterrorfor(contact_type, '请选择回复方式');
        return false;
    } else {
        setsuccessfor(contact_type);
    }

    if(phonevalue === '') {
        seterrorfor(phone, '联系方式不能为空');
        return false;
    } else {
        setsuccessfor(phone);
    }

    if(messagevalue === '') {
        seterrorfor(message, '留言内容不能为空');
        return false;
    } else {
        setsuccessfor(message);
    }
    
    if(yzmvalue === '') {
        seterrorfor(yzm, '验证码不能为空');
        return false;
    } else {
        setsuccessfor(yzm);
    }
    return true;
}

function seterrorfor(input, message) {
    const formcontrol = input.parentelement;
    const small = formcontrol.queryselector('small');
    formcontrol.classname = 'form-control error';
    small.innertext = message;
}

function setsuccessfor(input) {
    const formcontrol = input.parentelement;
    formcontrol.classname = 'form-control success';
}
    
function isemail(email) {
    return /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-za-z\-0-9]+\.)+[a-za-z]{2,}))$/.test(email);
}

/**
 +----------------------------------------------------------
 * 刷新验证码
 +----------------------------------------------------------
 */
function refreshimage() {
    var cap = document.getelementbyid("vcode");
    cap.src = cap.src + '?';
}