JS中電話號碼的自定義驗證

Question

我正在嘗試在表單提交時添加電話驗證。 主要目標是：如果手機不是以“39”或“+39”開頭，請在號碼前添加此號碼並提交。 代碼是通過腳本管理器在 body 標簽之后添加的。 但它不適用於提交。 而且我在瀏覽器控制台中沒有任何錯誤。

<form action="some.php" method="POST">
  <div class="fields">
    <div class="lp-pom-form-field single-line-text" id="container_nome">
      <label class="main lp-form-label" for="nome" id="label_nome" style="height: auto;">
        <span class="label-style">Nome e Cognome&nbsp;*</span>
      </label>
      <input type="text" id="nome" name="nome" placeholder="" class="ub-input-item single text form_elem_nome">
    </div>
    <div class="lp-pom-form-field single-line-text" id="container_telefono">
      <label class="main lp-form-label" for="telefono" id="label_telefono" style="height: auto;">
        <span class="label-style">Telefono&nbsp;*</span>
      </label>
      <input type="text" id="telefono" name="telefono" placeholder="" class="ub-input-item single text form_elem_telefono">
    </div>
  </div>
</form>

 window.onload = function() {
      var mainForm = document.forms[0];
      mainForm.addEventListener("submit", function validPhone() {
        var re = /^\+?\d{1,3}?[- .]?\(?(?:\d{2,3})\)?[- .]?\d\d\d[- .]?\d\d\d\d$/;
        var myPhone = '';
        var element = document.getElementById('telefono');
        if (element != null) {
          myPhone = element.value;
        }
        else {
          myPhone = null;
        }
        var myPhoneTrim = myPhone.trim().replace(/\s|\-|\(|\)/g, "");
        var valid = re.test(myPhoneTrim);

        if (myPhoneTrim.startsWith("39")) {
          myPhoneTrim = "+" + myPhoneTrim;
        } else if (!myPhoneTrim.startsWith("39") && !myPhoneTrim.startsWith("+39")) {
          myPhoneTrim = "+39" + myPhoneTrim;
        }
        return valid;
      });
    }

Answer 1

嘗試使用string.match()

var matches = string.match(^39); 而不是if (myPhoneTrim.startsWith("39"))

和var matches = string.match(^[+]39);

但是，我認為您的初始代碼沒有問題。 你能把HTML貼出來嗎？

Answer 2

不確定您的 HTML 是什么樣子或您如何應用 JS 腳本，但在 JSFiddle 中運行它似乎沒問題： https ://jsfiddle.net/7u2h3nqn/17/

JS：

var mainForm = document.getElementById("lp-pom-button-205");

mainForm.addEventListener("click", function validPhone() {

        var re = /^\+?\d{1,3}?[- .]?\(?(?:\d{2,3})\)?[- .]?\d\d\d[- .]?\d\d\d\d$/;
        var myPhone = '';
        var element = document.getElementById('telefono');

        if (element != null) {
          myPhone = element.value;
        }
        else {
          myPhone = null;
        }
        var myPhoneTrim = myPhone.trim().replace(/\s|\-|\(|\)/g, "");
        var valid = re.test(myPhoneTrim);

        if (myPhoneTrim.startsWith("39")) {
          myPhoneTrim = "+" + myPhoneTrim;
        } else if (!myPhoneTrim.startsWith("39") && !myPhoneTrim.startsWith("+39")) {
          myPhoneTrim = "+39" + myPhoneTrim;
        }

        console.log(myPhoneTrim);

        return valid;
})