空手道 UI 中的 ShadowRoot dom 元素访问问题

Question

我正在尝试访问 ShadowRoot dom 树元素，但我面临的问题是我无法使用特定的 html 元素来调用 .ShadowRoot，因为该元素是动态的（见下文 html sn-p id="vaadin-text -field-error-0)。所以我唯一能做的就是访问上一层的.vaadin-text-field-container类。基本上，下面是html代码sn-p，它返回一个“错误消息= 最多 255 个字符”，在我的 KarateUI 测试中，我试图断言该错误消息。到目前为止，我根据之前阅读的论坛查询尝试了以下选项，但运气不好，我永远无法访问返回文本“255”的正确元素characters max" 来做断言：

尝试1：

  * def test = script('.vaadin-text-field-container', '_.innerHTML')
  * print "Error Message is" + test

输出：

evaluation (js) failed: script('.vaadin-text-field-container', '_.innerHTML'), js eval failed twice:(function(){ var fun = function(_){ return _.innerHTML }; var e = document.querySelector(".vaadin-text-field-container"); return fun(e) })(), error: {"type":"object","subtype":"error","className":"TypeError","description":"TypeError: Cannot read property 'innerHTML' of null\n    at fun (<anonymous>:1:46)\n    at <anonymous>:1:130\n    at <anonymous>:1:139","objectId":"{\"injectedScriptId\":3,\"id\":3}"}

尝试2：

  * def test = script('//*[@id="vaadin-text-field-error-0"]', '_.innerHTML')
  * print 'Error Message is :' + test

输出：

evaluation (js) failed: script('//*[@id="vaadin-text-field-error-0"]', '_.innerHTML'), js eval failed twice:(function(){ var fun = function(_){ return _.innerHTML }; var e = document.evaluate("//*[@id="vaadin-text-field-error-0"]", document, null, 9, null).singleNodeValue; return fun(e) })(), error: {"type":"object","subtype":"error","className":"SyntaxError","description":"SyntaxError: missing ) after argument list","objectId":"{\"injectedScriptId\":3,\"id\":3}"}

尝试 3：

* match text('#vaadin-text-field-error-0') == '255 characters max'

输出：

evaluation (js) failed: text('#vaadin-text-field-error-0'), js eval failed twice:document.querySelector("#vaadin-text-field-error-0")['textContent'], error: {"type":"object","subtype":"error","className":"TypeError","description":"TypeError: Cannot read property 'textContent' of null\n    at <anonymous>:1:53","objectId":"{\"injectedScriptId\":3,\"id\":3}"}

HTML 代码 sn-p 在这里：

<vaadin-text-field class="standardformfield" id="runsetup" tabindex="0" required has-label has-helper has-value invalid has-error-message>
#shadow-root (open)
<div class="vaadin-text-field-container">

      <label part="label" id="vaadin-text-field-label-0">Run Name</label>

      <div part="input-field" id="vaadin-text-field-input-0">

        <slot name="prefix"></slot>

        <slot name="input">
          <input part="value" tabindex="0" aria-labelledby="vaadin-text-field-label-0 vaadin-text-field-input-0" placeholder="Type here..." required="" aria-describedby="vaadin-text-field-helper-0 vaadin-text-field-error-0" invalid="" aria-invalid="true">
        </slot>

        <div part="clear-button" id="clearButton" role="button" aria-label="Clear" hidden="true"></div>
        <slot name="suffix"></slot>

      </div>

      <div part="helper-text" id="vaadin-text-field-helper-0">
        <slot name="helper">No special characters, 255 characters max</slot>
      </div>

      <div part="error-message" aria-live="assertive" aria-hidden="false" id="vaadin-text-field-error-0">255 characters max</div>

    </div>

</vaadin-text-field>

有人可以调查一下并指出我在这里做错了什么吗？ 谢谢， 桑迪

Answer 1

如果此答案不能回答您的问题：https://stackoverflow.com/a/61742555/143475

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