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KenmaroAdvent Calendar 2022

Day 17

Selenium でループを書いたときの stale element reference: element is not attached to the page document エラー回避備忘録

Last updated at Posted at 2022-12-16

概要

久しぶりにSelenium を使ったら、
ループ処理のところで

stale element reference: element is not attached to the page document

といういうエラーに遭遇し、少しだけ詰まったので備忘録として残しておきます。

問題となったコード

汚いコードなのは許してください。。

test.py

divEl = driver.find_element_by_class_name("htBlock-adjastableTableF_inner")
tableElem = divEl.find_elements(By.TAG_NAME, "table")
tbodys = tableElem[0].find_elements(By.TAG_NAME, "tbody")
trs = tbodys[0].find_elements(By.TAG_NAME, "tr")

for i in range(len(trs)):
    tmp1 = trs[i].find_element_by_class_name("htBlock-adjastableTableF_actionRow")  # td

このループにおいて、0回目のループでは問題なく

tmp1 = trs[i].find_element_by_class_name("htBlock-adjastableTableF_actionRow")  # td

が行えていたのに対し、1回目のループでタイトルのエラーとなっていました。

解決策

test.py
divEl = driver.find_element_by_class_name("htBlock-adjastableTableF_inner")
tableElem = divEl.find_elements(By.TAG_NAME, "table")
tbodys = tableElem[0].find_elements(By.TAG_NAME, "tbody")
trs = tbodys[0].find_elements(By.TAG_NAME, "tr")

for i in range(len(trs)):
    divEl = driver.find_element_by_class_name("htBlock-adjastableTableF_inner")
    tableElem = divEl.find_elements(By.TAG_NAME, "table")
    tbodys = tableElem[0].find_elements(By.TAG_NAME, "tbody")
    trs = tbodys[0].find_elements(By.TAG_NAME, "tr")
    tmp1 = trs[i].find_element_by_class_name("htBlock-adjastableTableF_actionRow")  # td

ループの中でページ内のDOM情報を再度取得するように書くと、問題なくプログラムが実行されました。

以上。

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