点击元素后使用javascript延迟点击xpath

Question

我正在处理 xpath 脚本，我想这样工作，它会每隔 1 秒继续查找 xpath，当找到元素/xpath 时，它将单击该元素，然后等待 5 秒，然后再次开始 1 秒以继续查找,

<script>
/**
 * Specify the element XPath
 */
var xpath = "/html/body/div[1]/a[5]";

/**
 * The following lines do not need to be changed
 */
function getElementByXpath(path) {
  return document.evaluate(
    path,
    document,
    null,
    XPathResult.FIRST_ORDERED_NODE_TYPE,
    null
  ).singleNodeValue;
}

/**
 * Find an element with the XPath
 */
var element = getElementByXpath(xpath);

/**
 * Exit if the element does not exist
 */
if (!element) {
  throw new Error("Error: cannot find an element with XPath(" + xpath + ")");
}

/**
 * Click the element
 */
element.click();

</script>

我试过setinterval 1000；但它会每隔一秒点击一次元素，当点击完成时，它应该等待 5 秒，然后再点击。

Answer 1

您尝试使用 setInterval

1000

，这意味着 1 秒。添加另一个 setTimeout 等待 5 秒再检查

<script>
/**
 * Specify the element XPath
 */
var xpath = "/html/body/div[1]/a[5]";

/**
 * The following lines do not need to be changed
 */
function getElementByXpath(path) {
  return document.evaluate(
    path,
    document,
    null,
    XPathResult.FIRST_ORDERED_NODE_TYPE,
    null
  ).singleNodeValue;
}

function clickElement() {
  /**
   * Find an element with the XPath
   */
  var element = getElementByXpath(xpath);

  /**
   * Exit if the element does not exist
   */
  if (!element) {
    console.log("Element not found with XPath: " + xpath);
    return;
  }

  /**
   * Click the element
   */
  element.click();

  /**
   * Wait for 5 seconds before checking again
   */
  setTimeout(function() {
    setInterval(clickElement, 1000);
  }, 5000);
}

/**
 * Start the script by clicking the element
 */
clickElement();
</script>

Answer 2

最好使用

setTimeout

而不是

setInterval

，否则您将需要处理停止计时器的问题。

var RETRY_DELAY   = 1000;
var COOLOFF_DELAY = 5000;

function pollElement() {
  /**
   * Find an element with the XPath
   */
  var element = getElementByXpath(xpath);

  /**
   * If the element doesn't exist, wait RETRY_DELAY then retry 
   */
  if (!element) {
    console.log("Element not found with XPath: " + xpath);
    setTimeout(pollElement, RETRY_DELAY);
  }

  /**
   * Click the element
   */
  element.click();

  /**
   * Wait for COOLOFF_DELAY before checking again
   */
  setTimeout(pollElement, COOLOFF_DELAY);
}

// Start polling
pollElement();