Thomas Machinton Thomas Machinton - 1 year ago 339
Python Question

How to change element class attribute value using selenium

I lost my credentials.. so I'm creating this new thread. The old question it here if it helps: How to click a button to vote with python

I'd like to change this line:

<a data-original-title="I&nbsp;like&nbsp;this&nbsp;faucet" href="#" class="vote-link up" data-faucet="39274" data-vote="up" data-toggle="tooltip" data-placement="top" title=""><span class="glyphicon glyphicon-thumbs-up"></span></a>

to this:

<a data-original-title="I&nbsp;like&nbsp;this&nbsp;faucet" href="#" class="vote-link up voted" data-faucet="39274" data-vote="up" data-toggle="tooltip" data-placement="top" title=""><span class="glyphicon glyphicon-thumbs-up"></span></a>

So that the vote is set changing
vote-link up
vote-link up voted

But the problem is that in that site, there are severals items to vote, and the element "data-faucet" changes. If I use this script:

from selenium import webdriver

driver = webdriver.Firefox()
element = driver.find_element_by_css_selector(".vote-link.up")
element_attribute_value = element.get_attribute("data-faucet")
if element_attribute_value == "39274":
print ("Value: {0}".format(element_attribute_value))

But it obsiusly doesn't print anything, cause the first attribute value has another number. How can I select my line with the input of the number of
element, so I can replace it with
vote-link up voted

I only can do this selenium? Is there another way without using a real browser?

Anyway, this is the structure of the webpage:

<body role="document">
<div id="static page" class="container-fluid">
<div id="page" class="row"></div>
<div id="faucets-list">
<tr class=""></tr>
<tr class=""></tr>
<tr class=""></tr>
<tr class=""></tr>
# an infinite number of nodes, until there's mine
<tr class="">
<td class="vote-col">
<div class="vote-box">
<div class="vote-links">
<a class="vote-link up" data-original-title="I like this faucet" href="#" data-faucet"39274" data-vote"up" data-toggle"tooltip" data-placement="top" title=""></a>

The site is this:

Answer Source

From comments:-

Do you want to interact with element which has data-faucet attribute value 39274??

exatly! just what I want to do!

You should try using css_selector as below :-

element = driver.find_element_by_css_selector(".vote-link.up[data-faucet = '39274']")

ok.. now it selects something in fact if I print(element) terminal shows: <selenium.webdriver.remote.webelement.WebElement (session="d54ae232-6d42-455f-a130-097be89adf1e", element="{96385594-1725-4843-bfed-d5a4e7b9af41}")>. so now that I've selected it, how can I replace "vote-link up" with "vote-link up voted"?

You can replace class attribute value using execute_script() as below :-

driver.execute_script("arguments[0].setAttribute('class','vote-link up voted')", element)
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