Java selenium chrome 驱动程序的 getText() 方法有时会返回一个空字符串
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getText() method of selenium chrome driver sometimes returns an empty string
提问by HymanhammersForWeeks
I have a curious case where the selenium chrome driver getText()method (java) returns an empty string for some elements, even though it returns a non-empty string for other elements with the same xpath. Here is a bit of the page.
我有一个奇怪的案例，即 selenium chrome 驱动程序getText()方法 (java) 为某些元素返回一个空字符串，即使它为具有相同xpath. 这是页面的一部分。
<div __gwt_cell="cell-gwt-uid-223" style="outline-style:none;">
<div>Text_1</div>
<div>Text_2</div>
<div>Text_3</div>
<div>Text_4</div>
<div>Text_5</div>
<div>Text_6</div>
</div>
for each of the inner tags, I can get valid return values for getTagName(), getLocation(), isEnabled(), and isDisplayed(). However, getText() returns an empty string for some of the divs.
每个内标签的，我可以得到有效的返回值getTagName()，getLocation()，isEnabled()，和isDisplayed()。但是，getText() 会为某些 div 返回一个空字符串。
Further, I notice that if I use the mac chrome driver, it is consistently the ‘Text_5' for which getText()returns an empty string. If I use the windows chrome driver, it is , it is consistently the ‘Text_2' for which getText()returns an empty string. If I use the firefox driver, getText()returns the expected text from all the divs.
此外，我注意到如果我使用 mac chrome 驱动程序，它始终是getText()返回空字符串的 'Text_5' 。如果我使用 windows chrome 驱动程序，它始终是getText()返回空字符串的“Text_2” 。如果我使用 firefox 驱动程序，则getText()返回所有 div 的预期文本。
Has anyone else had this difficulty?
有没有其他人遇到过这种困难？
In my code, I use something like this…
在我的代码中，我使用了这样的东西......
ArrayList<WebElement> list = (ArrayList<WebElement>) driver.findElements(By.xpath(“my xPath here”));
for (WebElement e: list) System.out.println(e.getText());
As suggested below, here is the actual xPathI am using. The page snippet above deals with the last two divs.
如下所示，这是xPath我正在使用的实际情况。上面的页面片段处理最后两个 div。
//*[@class='gwt-DialogBox']//tr[contains(@class,'data-grid-table-row')]//td[contains(@class,'lms-assignment-selection-wizard-cell')]/div/div
采纳答案by Faiz
Update:The textContentattribute is a better option and supported across the majority of browsers. The differences are explained in detail at this blog post: innerText vs. textContent
更新：该textContent属性是一个更好的选择，并且被大多数浏览器支持。这篇博文详细解释了这些差异：innerText vs. textContent
As an alternative, the innerTextattribute will return the text content of an element which exists in the DOM.
作为替代方案，该innerText属性将返回存在于 DOM 中的元素的文本内容。
element.getAttribute("innerText")
The isDisplayed()method can sometimes trip over when the element is not really hidden but outside the viewport; getText()returns an empty string for such an element.
isDisplayed()当元素不是真正隐藏而是在视口之外时，该方法有时会绊倒；getText()为这样的元素返回一个空字符串。
You can also bring the element into the viewport by scrolling to it using javascript, as follows:
您还可以通过使用 javascript 滚动到该元素将元素带入视口，如下所示：
((JavaScriptExecutor)driver).executeScript("arguments[0].scrollIntoView(true);", element);
and then getText()should return the correct value.
然后getText()应该返回正确的值。
Details on the isDisplayed()method can be found in this SO question:
该isDisplayed()方法的详细信息可以在这个 SO 问题中找到：
回答by bsg
This is not a solution, so I don't know if it belongs in an answer, but it's too long for a comment and includes links, so I'm putting it an answer.
这不是解决方案，所以我不知道它是否属于答案，但是评论太长并且包含链接，所以我把它作为答案。
I have had this issue as well. After doing some digging, it seems that the problem arises when trying to get the text of an element that is not visible on the screen.(As @Faiz comments above.)This can happen if the element is not scrolled to, or if you scroll down and the element is near the top of the document and no longer visible after the scroll. I see you have a FindElements() call that gets a list of elements. At least some are probably not visible; you can check this by trying boolean b = webElement.isDisplayed();on each element in the list and checking the result. (See herefor a very long discussion of this issue that's a year old and still no resolution.)
我也有这个问题。在做了一些挖掘之后，似乎在尝试获取屏幕上不可见的元素的文本时出现了问题。（正如上面@Faiz 评论的那样。）如果元素没有滚动到，或者如果你向下滚动，元素位于文档顶部附近，滚动后不再可见。我看到您有一个 FindElements() 调用来获取元素列表。至少有些可能是不可见的；您可以通过尝试boolean b = webElement.isDisplayed();列表中的每个元素并检查结果来检查这一点。（请参阅此处对这个问题进行了很长时间的讨论，该问题已有一年之久，但仍然没有解决方案。）
Apparently, this is a deliberate design decision (see here); gettext on invisible elements is supposed to return empty. Why they are so firm about this, I don't know. Various workarounds have been suggested, including clicking on the element before getting its text or scrolling to it. (See above link for example code for the latter.) I can't vouch for these because I haven't tried them, but they're just trying to bring the element into visiblity so the text will be available. Not sure how practical that is for your application; it wasn't for mine. For some reason, FirefoxDriver does not have this issue, so that's what I use.
显然，这是一个深思熟虑的设计决定（请参阅此处）；不可见元素上的 gettext 应该返回空。为什么他们如此坚定，我不知道。已经提出了各种解决方法，包括在获取其文本或滚动到该元素之前单击该元素。（有关后者的示例代码，请参见上面的链接。）我无法保证这些，因为我还没有尝试过，但他们只是试图使元素可见，以便文本可用。不确定这对您的应用程序有多实用；这不是给我的。出于某种原因，FirefoxDriver 没有这个问题，所以这就是我使用的。
I'm sorry I can't give you a better answer - perhaps if you submit a bug report on the issues pagethey'll see that many people find it to be a bug rather than a feature and they'll change the functionality.
很抱歉，我不能给你一个更好的答案——也许如果你在问题页面上提交错误报告，他们会看到很多人发现它是一个错误而不是一个功能，他们会改变功能。
Good luck! bsg
祝你好运！bsg
EDIT
编辑
See this questionfor a possible workaround. You won't be able to use it exactly as given if isDisplayed returns true, but if you know which element is causing the issue, or if the text is not normally blank and you can set an 'if string is empty' condition to catch it when it happens, you can still try it. It doesn't work for everyone, unfortunately.
有关可能的解决方法，请参阅此问题。如果 isDisplayed 返回 true，您将无法完全按照给定的方式使用它，但是如果您知道是哪个元素导致了问题，或者如果文本通常不是空白并且您可以设置“如果字符串为空”条件来捕获当它发生时，你仍然可以尝试它。不幸的是，它并不适用于所有人。
NEW UPDATEI just tried the answer given below and it worked for me. So thanks, Faiz!
新更新我刚刚尝试了下面给出的答案，它对我有用。所以谢谢你，法兹！
回答by Kambiz
if you don't care about isDisplayed or scrolling position, you can also write
如果你不关心 isDisplayed 或滚动位置，你也可以写
String text = ((JavaScriptExecutor)driver).executeScript("return $(arguments[0]).text();", element);
or without jquery
或者没有 jquery
String text = ((JavaScriptExecutor)driver).executeScript("return arguments[0].innerText;", element);
回答by sathish p
WebElement.getAttribute("value") should help you !!
WebElement.getAttribute("value") 应该可以帮助你！！
回答by Nand
for (int count=0;count<=sizeofdd;count++)
{
String GetInnerHTML=getddvalue.get(count).getAttribute("innerHTML");
}
where, 1. getddvalue is the WebElement 2. sizeofdd is the size of getddvalue
其中， 1. getddvalue 是 WebElement 2. sizeofdd 是 getddvalue 的大小
回答by Nand
Related to getText()I have also an issue and I resolved so:
与getText()我也有一个问题相关，我解决了这个问题：
WebElement errMsg;
errMsg = driver.findElement(By.xpath("//div[@id='mbr-login-error']"));
WebElement parent = driver.findElement(By.xpath("//form[@id='mbr-login-form']"));
List<WebElement> children = parent.findElements(By.tagName("div"));
System.out.println("Size is: "+children.size());
//((JavascriptExecutor)driver).executeScript("arguments[0].scrollIntoView(true);", children);
for(int i = 0;i<children.size();i++)
{
System.out.println(i + " " + children.get(i).getText());
}
int indexErr = children.indexOf(errMsg);
System.out.println("index " + indexErr);
Assert.assertEquals(expected, children.get(indexErr).getText());
None of the above solutions worked for me.
以上解决方案都不适合我。
回答by ramya madhusudhan
element.getAttribute("innerText")worked for me, when getText()was returning empty.
element.getAttribute("innerText")为我工作，什么时候getText()返回空。
回答by SandstormNick
I encountered a similar issue recently.
我最近遇到了类似的问题。
I had to check that the menu tab "LIFE EVENTS" was present in the scroll box. The problem is that there are many menu tabs and you are required to scroll down to see the rest of the menu tabs. So my initial solution worked fine with the visible menu tabs but not the ones that were out of sight.
我必须检查滚动框中是否存在菜单选项卡“LIFE EVENTS”。问题是有很多菜单选项卡，您需要向下滚动才能看到其余的菜单选项卡。所以我最初的解决方案适用于可见的菜单选项卡，但不适用于那些看不见的选项卡。
I used the xpath below to point selenium to the parent element of the entire scroll box.
我使用下面的 xpath 将 selenium 指向整个滚动框的父元素。
@FindBy(xpath = "//div[contains(@class, 'menu-tree')]")
protected WebElement menuTree;
I then created a list of WebElements that I could increment through. The solution worked if the menu tab was visible, and returned a true. But if the menu tab was out of sight, it returned false
然后我创建了一个我可以递增的 WebElements 列表。如果菜单选项卡可见，该解决方案有效，并返回 true。但是如果菜单选项卡不在视线范围内，则返回 false
public boolean menuTabPresent(String theMenuTab) {
List<WebElement> menuTabs = new ArrayList<WebElement>();
menuTabs = menuTree.findElements(By.xpath("//i/following-sibling::span"));
for(WebElement e: menuTabs) {
System.out.println(e.getText());
if(e.getText().contains(theMenuTab)) {
return true;
}
}
return false;
}
I found 2solutions to the problem which both work equally well.
我找到了解决这个问题的2 个解决方案，它们都同样有效。
for(WebElement e: menuTabs) {
scrollElementIntoView(e); //Solution 1
System.out.println(e.getAttribute("textContent")); //Solution 2
if(e.getAttribute("textContent").contains(theMenuTab)) {
return true;
}
}
return false;
Solution 1 calls the method below. It results in the scroll box to physically move down while selenium is running.
解决方案 1 调用下面的方法。这会导致在 selenium 运行时滚动框物理向下移动。
protected void scrollElementIntoView(WebElement element) {
((JavascriptExecutor) driver).executeScript("arguments[0].scrollIntoView(true)", element);
}
Solution 2 gets the text content (even for the menu tabs not currently visible) of the attribute that you are pointing to. Thus doing the job properly that .getText() was not able to do in this situation.
解决方案 2 获取您指向的属性的文本内容（即使对于当前不可见的菜单选项卡）。因此正确地完成了 .getText() 在这种情况下无法完成的工作。
回答by Jonas Freire
Worked for me:
为我工作：
add as a predicate of xpath the length of string greater than 0:
添加大于 0 的字符串长度作为 xpath 的谓词：
String text = wait.until(ExpectedConditions.presenceOfElementLocated(By.xpath("//span[string-length(text()) > 0]"))).getText();
