如何在Keycloak中通过新密码字段同步更新确认密码字段值？

要实现只展示新密码字段，同时让隐藏的确认密码字段自动同步新密码的值，按以下步骤修改login-update-password.ftl：

1. 隐藏确认密码的表单区域 #

找到包含password-confirm的整个表单组div，给它加上style="display:none;"，这样整个确认密码的输入区域就不会在页面上显示。

2. 添加同步密码的JavaScript #

在表单结束前（</form>标签之前）添加一段JS，监听新密码输入框的输入事件，实时把值同步到隐藏的确认密码输入框里。

修改后的完整代码 #

<#import "template.ftl" as layout>
<@layout.registrationLayout displayMessage=!messagesPerField.existsError('password','password-confirm'); section>
    <#if section = "header">
        ${msg("updatePasswordTitle")}
    <#elseif section = "form">
        <form id="kc-passwd-update-form" class="${properties.kcFormClass!}" action="${url.loginAction}" method="post">
            <input type="text" id="username" name="username" value="${username}" autocomplete="username"
                   readonly="readonly" style="display:none;"/>
            <input type="password" id="password" name="password" autocomplete="current-password" style="display:none;"/>

            <div class="${properties.kcFormGroupClass!}">
                <div class="${properties.kcLabelWrapperClass!}">
                    <label for="password-new" class="${properties.kcLabelClass!}">${msg("passwordNew")}</label>
                </div>
                <div class="${properties.kcInputWrapperClass!}">
                    <input type="password" id="password-new" name="password-new" class="${properties.kcInputClass!}"
                           autofocus autocomplete="new-password"
                           aria-invalid="<#if messagesPerField.existsError('password','password-confirm')>true</#if>"
                    />

                    <#if messagesPerField.existsError('password')>
                        <span id="input-error-password" class="${properties.kcInputErrorMessageClass!}" aria-live="polite">
                            ${kcSanitize(messagesPerField.get('password'))?no_esc}
                        </span>
                    </#if>
                </div>
            </div>

            <!-- 隐藏确认密码的表单组 -->
            <div class="${properties.kcFormGroupClass!}" style="display:none;">
                <div class="${properties.kcLabelWrapperClass!}">
                    <label for="password-confirm" class="${properties.kcLabelClass!}">${msg("passwordConfirm")}</label>
                </div>
                <div class="${properties.kcInputWrapperClass!}">
                    <input type="password" id="password-confirm" name="password-confirm"
                           class="${properties.kcInputClass!}"
                           autocomplete="new-password"
                           aria-invalid="<#if messagesPerField.existsError('password-confirm')>true</#if>"
                    />

                    <#if messagesPerField.existsError('password-confirm')>
                        <span id="input-error-password-confirm" class="${properties.kcInputErrorMessageClass!}" aria-live="polite">
                            ${kcSanitize(messagesPerField.get('password-confirm'))?no_esc}
                        </span>
                    </#if>

                </div>
            </div>

            <div class="${properties.kcFormGroupClass!}">
                <div id="kc-form-options" class="${properties.kcFormOptionsClass!}">
                    <div class="${properties.kcFormOptionsWrapperClass!}">
                        <#if isAppInitiatedAction??>
                            <div class="checkbox">
                                <label><input type="checkbox" id="logout-sessions" name="logout-sessions" value="on" checked> ${msg("logoutOtherSessions")}</label>
                            </div>
                        </#if>
                    </div>
                </div>

                <div id="kc-form-buttons" class="${properties.kcFormButtonsClass!}">
                    <#if isAppInitiatedAction??>
                        <input class="${properties.kcButtonClass!} ${properties.kcButtonPrimaryClass!} ${properties.kcButtonLargeClass!}" type="submit" value="${msg("doSubmit")}" />
                        <button class="${properties.kcButtonClass!} ${properties.kcButtonDefaultClass!} ${properties.kcButtonLargeClass!}" type="submit" name="cancel-aia" value="true" />${msg("doCancel")}</button>
                    <#else>
                        <input class="${properties.kcButtonClass!} ${properties.kcButtonPrimaryClass!} ${properties.kcButtonBlockClass!} ${properties.kcButtonLargeClass!}" type="submit" value="${msg("doSubmit")}" />
                    </#if>
                </div>
            </div>

            <!-- 添加同步密码的JS -->
            <script>
                const newPasswordInput = document.getElementById('password-new');
                const confirmPasswordInput = document.getElementById('password-confirm');
                
                // 实时同步输入值
                newPasswordInput.addEventListener('input', function() {
                    confirmPasswordInput.value = this.value;
                });
                
                // 页面加载时如果有默认值也同步（可选）
                if (newPasswordInput.value) {
                    confirmPasswordInput.value = newPasswordInput.value;
                }
            </script>
        </form>
    </#if>
</@layout.registrationLayout>

关键说明 #

• 隐藏确认密码区域：通过给外层div加display:none，既保留了表单需要的password-confirm参数，又不会在页面上显示该字段。
• 同步逻辑：通过监听新密码输入框的input事件，每次输入都把值同步到确认密码框，确保提交表单时两个字段值一致，满足后端API的参数要求。

内容的提问来源于stack exchange，提问作者jedda ler