英文:
any waitForJs function to wait for some javascript code returns true
问题
这是关于golang selenium webdriver的问题。
是否有一个函数，在某个js代码返回true之后才返回。
var session *webdriver.Session
...
session.waitForJs(`$('#redButton').css('color')=='red'`)
// 只有在`#redButton`变成红色之后才执行下一段代码
问题是session.waitForJs方法不存在。
英文:
This is question about golang selenium webdriver.
Is there any function that returns only after some js code return true.
var session *webdriver.Session
...
session.waitForJs(`$('#redButton').css('color')=='red'`)
// next code should be executed only after `#redButton` becomes red
The problem is that method session.waitForJs do not exist.
答案1
得分: 2
我在golang的Selenium绑定中没有看到任何等待函数，所以你很可能需要自己定义一个。这是我在golang中的第一次尝试，所以请谅解：
type elementCondition func(e WebElement) bool
// 在超时时间到期或元素条件为真时返回
func (e WebElement) WaitForCondition(fn elementCondition, timeOut int) {
// 如果元素条件不为真，则循环
for i := 0; !fn(e) && i < timeOut; i++ {
time.Sleep(1000)
}
}
有两种方法可以定义elementCondition。你使用JavaScript的方法看起来可以通过webdriver.go中记录的ExecuteScript函数来实现。
// 将一段JavaScript代码注入到当前选定的框架中执行。执行的脚本被假定为同步的，并且评估脚本的结果将返回给客户端。
另一种方法是通过Selenium访问元素属性：
func ButtonIsRed(e WebElement) bool {
return (e.GetCssProperty("color") == "red")
}
所以你的代码将变成：
var session *webdriver.Session
....
// 使用CSS选择器定位按钮
var webElement := session.FindElement(CSS_Selector, "#redButton")
// 等待按钮变为红色
webElement.WaitForCondition(ButtonIsRed, 10)
英文:
I don't see any wait functions in the golang bindings to Selenium, so you'll most likely need to define your own. This is my first attempt at golang, so bear with me:
type elementCondition func(e WebElement) bool
// Function returns once timeout has expired or the element condition is true
func (e WebElement) WaitForCondition(fn elementCondition, int timeOut) {
// Loop if the element condition is not true
for i:= 0; !elementCondition(e) && i < timeOut; i++ {
time.sleep(1000)
}
}
There are two options to define the elementCondition. Your method of using Javascript looks like it could work with the ExecuteScript function documented in webdriver.go
> // Inject a snippet of JavaScript into the page for execution in the
> context of the currently selected frame. The executed script is
> assumed to be synchronous and the result of evaluating the script is
> returned to the client.
An alternative is to access the element properties through Selenium
func ButtonIsRed(WebElement e) (bool) {
return (e.GetCssProperty('color') == 'red')
}
So your code would become
var session *webdriver.Session
....
// Locate the button with a css selector
var webElement := session.FindElement(CSS_Selector, '#redButton')
// Wait for the button to be red
webElement.WaitForCondition(ButtonIsRed, 10)
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