I want to hide elements on canvas element by executing a javascript in python.

I have tried below:

    def hide_elements():
        driver = LiveLibrary.get_webdriver_instance()

        js_script = '''\
        element1 = document.getElementsByClassName('someclass');
        element1[0].style.display = 'none';
        element2 = document.getElementsByClassName('another');
        element2[0].style.display = 'none';
        element3 = document.getElementsByClassName('highlight');
        element3[0].style.display = 'none';
        element4 = document.getElementsByClassName('overlay');
        element4[0].style.display = 'none';
        '''
        driver.execute_script(js_script)

The above works but as you can see there is a repetition of code. Is there a way I can simplify this rather than finding each element and hiding them?

I want to hide elements on canvas element by executing a javascript in python.

I have tried below:

    def hide_elements():
        driver = LiveLibrary.get_webdriver_instance()

        js_script = '''\
        element1 = document.getElementsByClassName('someclass');
        element1[0].style.display = 'none';
        element2 = document.getElementsByClassName('another');
        element2[0].style.display = 'none';
        element3 = document.getElementsByClassName('highlight');
        element3[0].style.display = 'none';
        element4 = document.getElementsByClassName('overlay');
        element4[0].style.display = 'none';
        '''
        driver.execute_script(js_script)

The above works but as you can see there is a repetition of code. Is there a way I can simplify this rather than finding each element and hiding them?

• javascript
• python
• selenium-webdriver

• This would work in a browser: [...document.querySelectorAll("[class^=class]")].forEach(ele => ele.style.display = "none"); – mplungjan Commented Sep 27, 2019 at 7:51

2 Answers 2

If only one of each class - I use ES<5 to not break your webdriver:

var cls = ["someclass","another","highlight","overlay"];
for (var i=0;i<cls.length;i++) {
  document.querySelector("."+cls[i]).style.display = "none";
}

This would work in a browser:

[...document.querySelectorAll("[class^=class]")].forEach(ele => ele.style.display = "none");

For different classes:

["someclass","another","highlight","overlay"]
  .forEach(cls => [...document.querySelectorAll("."+cls)]
  .forEach(ele => ele.style.display = "none"));

For older JS versions:

["someclass","another","highlight","overlay"]
  .forEach(function(cls) { [...document.querySelectorAll("."+cls)]
  .forEach(function(ele) { ele.style.display = "none"})});

Even older:

var cls= ["someclass","another","highlight","overlay"];
for (var i=0;i<cls.length;i++) {
  var elements = document.querySelectorAll("."+cls[i]);
  for (var j=0;j<elements.length;j++) {
    elements[j].style.display = "none";
  }
}

use following code :

js_script = '''\
document.getElementsByClassName('someclass')[0].setAttribute("hidden","");
document.getElementsByClassName('another')[0].setAttribute("hidden","");
document.getElementsByClassName('highlight')[0].setAttribute("hidden","");
document.getElementsByClassName('overlay')[0].setAttribute("hidden","");
 '''
driver.execute_script(js_script)