MDC-Web：mdc-text-field - 用预填充值概述

Question

我预先填写了几个文字字段，边框不可见。

我正在使用以下JavaScript来预填充字段，但是直到我单击/取消选择字段才会呈现轮廓。我试过了

var doc = document;
doc.getElementById("other-number-tf-ex-input").parentElement.classList.add("mdc-text-field--upgraded");
doc.getElementById("other-number-tf-ex-input").nextElementSibling.classList.add("mdc-text-field__label--float-above");
doc.getElementById("other-number-tf-ex-input").value = values[1].otherPhoneExtensionCode;
window.mdc.autoInit();

HTML是：

<div class="account-telephone-outlined-wrapper">
    <div class="mdc-text-field mdc-text-field--outlined mdc-text-field--dense tel-medium" data-mdc-auto-init="MDCTextField">
        <input required pattern="^[0-9]*$" type="text" id="cellular-number-tf-cc-input" class="mdc-text-field__input" aria-controls="cellular-number-tf-cc-message">
        <label for="cellular-number-tf-cc-input" class="mdc-text-field__label">1</label>
        <div class="mdc-text-field__outline">
            <svg>
                <path class="mdc-text-field__outline-path" d=""/>
            </svg>
        </div>
        <div class="mdc-text-field__idle-outline"></div>
    </div>
    <p class="mdc-text-field-helper-text mdc-text-field-helper-text--validation-msg" id="cellular-number-tf-cc-message">
        00000
    </p>
</div>

Answer 1

您应该显式实例化MDCTextField对象，然后设置值：

var doc = document;

var field = new mdc.textField.MDCTextField(doc.getElementById("other-number-tf-ex-input-container"));
field.value = values[1].otherPhoneExtensionCode;

这对我有用并触发浮动标签。

注意 other-number-tf-ex-input-container id：它必须指向容器mdc-text-field div。

Answer 2

我仅设置常规的禁用文本字段配置（禁用的类和输入的disabled属性），但以编程方式设置该值，例如：

myMDCtextfield.value = "myvalue";

然后触发浮动标签：）