为什么我在视口内收到坐标的 MoveTargetOutOfBoundsException 异常？ 怎么修？

Question

Using the following code:

elem = driver.find_element_by_xpath('/html/body/canvas')
from selenium.webdriver.common.action_chains import ActionChains
actions = ActionChains(driver)
actions.move_to_element_with_offset(elem, 185, -35).click().perform()

I am unable to navagate to the desired section of a canvas element and receive this error:

MoveTargetOutOfBoundsException: move target out of bounds
(Session info: chrome=85.0.4183.102)

My move target is most definitely within the viewport, no scrolling is necessary to make it clickable. I am using chromedriver and am using the top left corner of the canvas as the start point for my pixel coordinates for move_to_element_with_offset() . Any ideas to fix this? I'm interested in any solutions to click a specified point on a canvas in python, doesn't need to use this same method.

Answer 1

move_to_element_with_offset()

move_to_element_with_offset() moves the mouse by an offset of the specified element where offsets are relative to the top-left corner of the element.

So from the top-left corner of the <canvas> element if you intent to move by offset (185, -35) where:

• 185 units to the right
• 35 units upwards

will be always result into MoveTargetOutOfBoundsException .

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Solution

Instead of a negative offset to move upwards you can use a possitive offset to move downwards as follows:

actions.move_to_element_with_offset(elem, 35, 35).click().perform()

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References

You can find a relevant detailed discussion in:

• MoveTargetOutOfBoundsException problem with chromedriver version >74