量角器 - 等待换班

Question

量角器如何等待元素改变属性？当我进入主页面时，连接按钮有 class=红色，想等到它改变类为绿色

Answer 1

这是您正在解决的任务的通用方法

/**
*  waitUntilElementHasAttribute
*  @param    {ElementFinder}    $element                    Locator of element
*  @param    {String}           attributeName               Attribute of an element to evaluate
*  @param    {string}           [attributeString=""]        A target attribute value
*  @param    {number}           [timeout=1000]              Time in ms
*  @return   {Promise}
*/
waitUntilElementHasAttribute($element, attributeName, attributeString = '', timeout = 1000) {
  return browser.wait(
    () =>
      $element.getAttribute(attributeName).then(attributeValue => {
        if (attributeValue !== null) {
          return attributeValue.includes(attributeString);
        } else {
          return false;
        }
      }),
      timeout,
      "Wait until element '" + $element.locator() + "' HAS " + attributeName + ': ' + attributeString
  );
},

注意这个等待，直到指定的属性部分匹配字符串

要使用就这样称呼它

await waitUntilElementHasAttribute(
  $element,
  'class',
  'green',
  3000
)