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原生js實(shí)現(xiàn)表單的正則驗(yàn)證（驗(yàn)證通過后才可提交）

更新時(shí)間：2021年05月07日 12:05:48 作者：Kou_Hi

這篇文章主要給大家介紹了關(guān)于如何利用原生js實(shí)現(xiàn)表單的正則驗(yàn)證，所有驗(yàn)證都通過后提交按鈕才可用的相關(guān)資料，文中通過示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

實(shí)現(xiàn)了如下功能：

1.用戶名：onfouc顯示msg規(guī)則；onkeyup計(jì)算字符，其中中文為兩個(gè)字符；onblur，驗(yàn)證是否通過

2.郵箱：onblur 正則匹配，正則是根據(jù)自己的需求寫的，可以根據(jù)個(gè)人需求更改

3..密碼：onkeyup時(shí)顯示密碼的強(qiáng)弱度，onblur時(shí)驗(yàn)證密碼，是否為相同字符，是否全字符，或全數(shù)字，長度是否符合要求

4.確認(rèn)密碼：驗(yàn)證是否和上一次一致

5.提交按鈕只有在全部input驗(yàn)證通過后才有效，否則無效

主要知識(shí)點(diǎn)：

1.中文為兩個(gè)字符：

function getLength(str) {
    return str.replace(/[^\x00-xff]/g, "xx").length;
    //x00-xff表示在ascii碼中所有的雙字節(jié)字符，這句話意思是將所有非單字節(jié)的字符替換成xx，即兩個(gè)單字節(jié)字符，然后再計(jì)算長度
}

2.郵箱驗(yàn)證的正則：

var re_e = /^[\w_\.\-]+@[\w]+.([\w]{2,4})$/g

3.是否全為相同字符：

function findStr(str, n){
    var temp = 0;
    for(var i = 0;i<str.length;i++){
        if(str.charAt(i)==n){
            temp++:
        };
    }
}

4.是否全為數(shù)字，是否全為字符

 var　re_n =/[^\d]/g ;
 if(!re_n.test(str)){//全為數(shù)字}

 var　re_n =/[^\a-zA-Z]/g ;
 if(!re_n.test(str)){//全為字符}

5.表單驗(yàn)證全部通過按鈕才有效，可提交：

//我的處理是，在每一個(gè)input中都加入一個(gè)驗(yàn)證標(biāo)識(shí)符，例如email_state；另寫一個(gè)驗(yàn)證的函數(shù)，驗(yàn)證這四個(gè)input的驗(yàn)證標(biāo)識(shí)符則將按鈕設(shè)為可點(diǎn)，反之則禁用；再每一次onblur的時(shí)候都調(diào)用一次這個(gè)驗(yàn)證函數(shù)。

完整代碼如下

function register() {
    var oName = document.getElementById("name");
    var count = document.getElementById("count");
    var psw = document.getElementById("psw");
    var psw2 = document.getElementById("psw2");
    var email = document.getElementById("email");
    var name_msg = document.getElementsByClassName("name_msg")[0];
    var psw_msg = document.getElementsByClassName("psw_msg")[0];
    var psw2_msg = document.getElementsByClassName("psw2_msg")[0];
    var email_msg = document.getElementsByClassName("email_msg")[0];
    var psw = document.getElementById("psw");
    var psw2 = document.getElementById("psw2");
    var intensity = getByClass("intensity")[0].getElementsByTagName("span");
    var registerbtn = document.getElementById("submit");
    var oName_state = false;
    var email_state = false;
    var psw_state = false;
    var psw2_state = false;
    var name_length = 0;

    oName.onfocus = function() {
        name_msg.style.display = "inline-block";
    }
    oName.onkeyup = function() {
        count.style.visibility = "visible";
        name_length = getLength(this.value);
        count.innerHTML = name_length + "個(gè)字符";
        if (name_length == 0) {
            count.style.visibility = "hidden";
        }
    }
    oName.onblur = function() {
        //含有非法字符 不能為空 長度超25 長度少于6個(gè)字符
        var re = /[^\w\u4e00-\u9fa5]/g;
        if (re.test(this.value)) {
            name_msg.innerHTML = "<i class='fa fa-close'>含有非法字符</i>";
            oName_state = false;
        } else if (this.value == "") {
            name_msg.innerHTML = "<i class='fa fa-close'>不能為空</i>";
            oName_state = false;
        } else if (name_length > 25) {
            name_msg.innerHTML = "<i class='fa fa-close'>不能超出25個(gè)字符</i>";
            oName_state = false;
        } else if (name_length < 6) {
            name_msg.innerHTML = "<i class='fa fa-close'>不能少于6個(gè)字符</i>";
            oName_state = false;
        } else {
            name_msg.innerHTML = "<i class='fa fa-check-square'>OK!</i>";
            oName_state = true;
        }
        checkform();
    }

    psw.onfocus = function() {
        psw_msg.style.display = "inline-block";
        psw_msg.innerHTML = "<i class='fa fa-lightbulb-o'>6-16個(gè)字符，不能單獨(dú)使用字母、數(shù)字或符號(hào)</i>"
    }
    psw.onkeyup = function() {
        if (this.value.length > 5) {
            intensity[1].className = "active";
            psw2.removeAttribute("disabled");
            psw2_msg.style.display = "inline-block";
        } else {
            intensity[1].className = "";
            psw2.setAttribute("disabled", "");
            psw2_msg.style.display = "none";
        }
        if (this.value.length > 10) {
            intensity[2].className = "active";
            psw2.removeAttribute("disabled");
            psw2_msg.style.display = "inline-block";
        } else {
            intensity[2].className = "";
        }
    }
    psw.onblur = function() {
        //不能為空 不能相同字符 長度6-16 不能全數(shù)字 不能全字母 
        var m = findStr(psw.value, psw.value[0]);
        var re_n = /[^\d]/g;
        var re_t = /[^a-zA-Z]/g;
        if (this.value == "") {
            psw_msg.innerHTML = "<i class='fa fa-close'>不能為空</i>";
            psw_state = false;
        } else if (m == this.value.length) {
            psw_msg.innerHTML = "<i class='fa fa-close'>不能為相同字符</i>";
            psw_state = false;
        } else if (this.value.length < 6 || this.value.legth > 16) {
            psw_msg.innerHTML = "<i class='fa fa-close'>長度應(yīng)為6-16個(gè)字符</i>";
            psw_state = false;
        } else if (!re_n.test(this.value)) {
            psw_msg.innerHTML = "<i class='fa fa-close'>不能全部為數(shù)字</i>";
            psw_state = false;
        } else if (!re_t.test(this.value)) {
            psw_msg.innerHTML = "<i class='fa fa-close'>不能全部為字母</i>";
            psw_state = false;
        } else {
            psw_msg.innerHTML = "<i class='fa fa-check-square'>OK!</i>";
            psw_state = true;
        }
        checkform();
    }


    psw2.onblur = function() {
        if (psw2.value != psw.value) {
            psw2_msg.innerHTML = "<i class='fa fa-close'>兩次輸入不一致</i>";
            psw2_state = false;
        } else {
            psw2_msg.innerHTML = "<i class='fa fa-check-square'>OK!</i>";
            psw2_state = true;
        }
        checkform();
    }

    email.onblur = function() {
        var re_e = /^[\w_\-\.]+@[\w]+\.([\w]{2,4})$/g;
        if (!re_e.test(this.value)) {
            email_msg.innerHTML = "<i class='fa fa-close'>請(qǐng)輸入正確的郵箱格式</i>";;
            email_state = false;
        } else {
            email_msg.innerHTML = "<i class='fa fa-check-square'>OK!</i>";
            email_state = true;
        }
        checkform();
    }
    function checkform() {
        if (oName_state && oName_state && psw_state && psw2_state) {
            registerbtn.removeAttribute("disabled");
            // registerbtn.className+=" "+"readySubmit";
            $("#submit").addClass("readySubmit");
        } else {
            registerbtn.setAttribute("disabled", "");
            //registerbtn.className = registerbtn.className.replace( new RegExp( "(\\s|^)" + "readySubmit" + "(\\s|$)" ), " " );  
            // registerbtn.className = registerbtn.className.replace( /(\s|^)readySubmit(\s|$)/g, " " );       
            $("#submit").removeClass("readySubmit");
        }
    }
}

function getLength(str) {
    return str.replace(/[^\x00-xff]/g, "xx").length;
}

function findStr(str, n) {
    var temp = 0;
    for (var i = 0; i < str.length; i++) {
        if (str.charAt(i) == n) {
            temp++;
        }
    }
    return temp;
}

部分html代碼

<form id="form">
   <div class="name-field">
        <label>用戶名</label>
        <input type="text" id="name" autofocus requiered/><span class="msg name_msg"><i class="fa fa-lightbulb-o"> 5-25個(gè)字符，1個(gè)漢字為兩個(gè)字符，推薦使用中文會(huì)員名</i></span>
        <div id="count">0個(gè)字符</div>
   </div>
   <div class="email-field" requiered>
        <label>郵箱</label>
       <input type="text" id="email" /><span class="msg email_msg"></span>
       </div>
   <div class="pwd-field" requiered>
        <label>密碼</label>
        <input type="password" id="psw" /><span class="msg psw_msg"></span>
        <div class="intensity">
            <span class="active">弱</span><span>中</span><span>強(qiáng)</span>
       </div>
   </div>
   <div class="pwd2-field" requiered>
        <label>確認(rèn)密碼</label>
        <input type="password" id="psw2" disabled="" /><span class="msg psw2_msg">請(qǐng)?jiān)俅屋斎?lt;/span>
   </div>
   <button type="submit" id="submit" disabled="" class="submitBtn">注冊(cè)</button>
</form>

CSS部分

.name-field {
    margin-top: 10px
}

.email-field {
    margin-top: 3px
}

.pwd-field {
    margin-top: 10px
}

.pwd2-field {
    margin-top: 10px
}

.register label {
    float: left;
    width: 80px;
    margin-right: 10px;
    text-align: right
}

.register .name_msg,
.register .psw_msg,
.register .psw2_msg,
.register .email_msg {
    margin-left: 10px;
    display: none
}

.intensity,
#count {
    padding-left: 90px;
    margin-top: 3px
}

#count {
    visibility: hidden;
    color: #999;
    font-size: 12px
}

.intensity span {
    display: inline-block;
    background: #FBAA51;
    width: 55px;
    height: 20px;
    text-align: center
}

.intensity .active {
    background: rgba(0, 128, 0, 0.61)
}

.register .submitBtn {
    width: 163px;
    margin: 10px 0 0 90px
}

#submit {
    color: #555
}

總結(jié)

到此這篇關(guān)于原生js實(shí)現(xiàn)表單的正則驗(yàn)證（驗(yàn)證通過后才可提交）的文章就介紹到這了,更多相關(guān)js表單正則驗(yàn)證內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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