blocks|key|1199950|text|我认为您可以尝试首先选择字段中的所有文本，然后发送新序列：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1199951|from+selenium.webdriver.common.keys+import+Keys
element.sendKeys(Keys.chord(Keys.CONTROL,+"a"),+"55");|code-block|syntax|javascript|1199952|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I think you can try to firstly select all the text in the field and then send the new sequence:

<pre><code>from selenium.webdriver.common.keys import Keys
element.sendKeys(Keys.chord(Keys.CONTROL, "a"), "55");
</code></pre>

blocks|key|985543|text|您还可以在发送密钥之前清除该字段。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|985544|element.clear()
element.sendKeys("Some+text+here")|code-block|syntax|javascript|985545|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can also clear the field before sending it keys.

<pre><code>element.clear()
element.sendKeys("Some text here")
</code></pre>

blocks|key|1200111|text|好吧，那是几天前……在我目前的情况下，来自ZloiAdun的答案对我不起作用，但让我非常接近我的解决方案……|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1200112|而不是：|1200113|element.sendKeys(Keys.chord(Keys.CONTROL,+"a"),+"55");|code-block|syntax|javascript|1200114|下面的代码让我很高兴：|1200115|element.sendKeys(Keys.HOME,+Keys.chord(Keys.SHIFT,+Keys.END),+"55");|1200116|所以我希望这对某些人有帮助！|1200117|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Okay, it is a few days ago...
In my current case, the answer from ZloiAdun does not work for me, but brings me very close to my solution...

Instead of:

<pre><code>element.sendKeys(Keys.chord(Keys.CONTROL, "a"), "55");
</code></pre>

the following code makes me happy:

<pre><code>element.sendKeys(Keys.HOME, Keys.chord(Keys.SHIFT, Keys.END), "55");
</code></pre>

So I hope that helps somebody!

blocks|key|985798|text|这对我很有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|985799|mElement.sendKeys(Keys.HOME,Keys.chord(Keys.SHIFT,Keys.END),MY_VALUE);|code-block|syntax|javascript|985800|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This worked for me.

<pre><code>mElement.sendKeys(Keys.HOME,Keys.chord(Keys.SHIFT,Keys.END),MY_VALUE);
</code></pre>

blocks|key|985706|text|如果它对任何人有帮助，ZloiAdun的答案在C#上的等价物是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|985707|element.SendKeys(Keys.Control+%2B+"a");
element.SendKeys("55");|code-block|syntax|javascript|985708|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In case it helps anyone, the C# equivalent of ZloiAdun's answer is:

<pre><code>element.SendKeys(Keys.Control + "a");
element.SendKeys("55");
</code></pre>

blocks|key|985576|text|使用这个，它是值得信赖的解决方案，适用于所有浏览器：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|985577|protected+void+clearInput(WebElement+webElement)+{
++++//+isIE()+-+just+checks+is+it+IE+or+not+-+use+your+own+implementation
++++if+(isIE()+&&+"file".equals(webElement.getAttribute("type")))+{
++++++++//+workaround
++++++++//+if+IE+and+input's+type+is+file+-+do+not+try+to+clear+it.
++++++++//+If+you+send:
++++++++//+-+empty+string+-+it+will+find+file+by+empty+path
++++++++//+-+backspace+char+-+it+will+process+like+a+non-visible+char
++++++++//+In+both+cases+it+will+throw+a+bug.
++++++++//+
++++++++//+Just+replace+it+with+new+value+when+it+is+need+to.
++++}+else+{
++++++++//+if+you+have+no+StringUtils+in+project,+check+value+still+empty+yet
++++++++while+(!StringUtils.isEmpty(webElement.getAttribute("value")))+{
++++++++++++//+"\u0008"+-+is+backspace+char
++++++++++++webElement.sendKeys("\u0008");
++++++++}
++++}
}|code-block|syntax|javascript|985578|如果输入有文件“type=”-不要为IE清除它。它将尝试通过空路径查找文件，并抛出错误。|985579|有关更多详细信息，请访问on+my+blog|offset|length|985580|entityMap|0|LINK|mutability|MUTABLE|url|http://cyber-fall.blogspot.ru/2013/02/selenium-20-webdriver-best-practices.html^0|0|0|0|C|A|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Use this one, it is trusted solution and works well for all browsers:

<pre><code>protected void clearInput(WebElement webElement) {
 // isIE() - just checks is it IE or not - use your own implementation
 if (isIE() &amp;&amp; "file".equals(webElement.getAttribute("type"))) {
 // workaround
 // if IE and input's type is file - do not try to clear it.
 // If you send:
 // - empty string - it will find file by empty path
 // - backspace char - it will process like a non-visible char
 // In both cases it will throw a bug.
 // 
 // Just replace it with new value when it is need to.
 } else {
 // if you have no StringUtils in project, check value still empty yet
 while (!StringUtils.isEmpty(webElement.getAttribute("value"))) {
 // "\u0008" - is backspace char
 webElement.sendKeys("\u0008");
 }
 }
}
</code></pre>

If input has type="file" - do not clear it for IE. It will try to find file by empty path and will throw a bug.

More details you could find <a href="http://cyber-fall.blogspot.ru/2013/02/selenium-20-webdriver-best-practices.html" rel="nofollow">on my blog</a>

blocks|key|985856|text|由于textfield不接受键盘输入，并且鼠标解决方案似乎不完整，所以使用上述大多数方法都有问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|985857|这对于模拟在字段中单击，选择内容并将其替换为new起作用。|985858|+++++Actions+actionList+=+new+Actions(driver);
+++++actionList.clickAndHold(WebElement).sendKeys(newTextFieldString).
+++++release().build().perform();|code-block|syntax|javascript|985859|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Had issues using most of the mentioned methods since textfield had not accepted keyboard input, and the mouse solution seem not complete.

This worked for to simulate a click in the field, selecting the content and replacing it with new.

<pre><code> Actions actionList = new Actions(driver);
 actionList.clickAndHold(WebElement).sendKeys(newTextFieldString).
 release().build().perform();
</code></pre>

blocks|key|985945|text|使用以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|985946|driver.findElement(By.id("id")).sendKeys(Keys.chord(Keys.CONTROL,+"a",+Keys.DELETE),+"Your+Value");|code-block|syntax|javascript|985947|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Use the following:

<pre><code>driver.findElement(By.id("id")).sendKeys(Keys.chord(Keys.CONTROL, "a", Keys.DELETE), "Your Value");
</code></pre>

blocks|key|1200237|text|这解决了我在处理带有嵌入式JavaScript的超文本标记语言页面时遇到的问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1200238|WebElement+empSalary+=++driver.findElement(By.xpath(PayComponentAmount));
Actions+mouse2+=+new+Actions(driver);
mouse2.clickAndHold(empSalary).sendKeys(Keys.chord(Keys.CONTROL,+"a"),+"1234").build().perform();

JavascriptExecutor+js+=+(JavascriptExecutor)+driver;
js.executeScript("arguments[0].onchange()",+empSalary);|code-block|syntax|javascript|1200239|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This solved my problem when I had to deal with HTML page with embedded JavaScript 

<pre><code>WebElement empSalary = driver.findElement(By.xpath(PayComponentAmount));
Actions mouse2 = new Actions(driver);
mouse2.clickAndHold(empSalary).sendKeys(Keys.chord(Keys.CONTROL, "a"), "1234").build().perform();

JavascriptExecutor js = (JavascriptExecutor) driver;
js.executeScript("arguments[0].onchange()", empSalary);
</code></pre>

blocks|key|985933|text|原来的问题是不能使用clear()。这不适用于那种情况。我在这里添加我的工作示例，因为这篇文章是Google在输入值之前清除输入的第一个结果之一。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|985934|对于这里没有额外限制的输入，我使用NodeJS为Selenium提供了一种与浏览器无关的方法。此代码片段是我在测试脚本中使用var+test+=+require(+'common'+);导入的通用库的一部分。它用于标准节点module.exports定义。|offset|length|style|CODE|985935|when_id_exists_type+:+function(+id,+value+)+{
driver.wait(+webdriver.until.elementLocated(+webdriver.By.id(+id+)+)+,+3000+)
++++.then(+function()+{
++++++++var+el+=+driver.findElement(+webdriver.By.id(+id+)+);
++++++++el.click();
++++++++el.clear();
++++++++el.sendKeys(+value+);
++++});
},|code-block|syntax|javascript|985936|找到元素，单击它，清除它，然后发送密钥。|985937|This+page+has+a+complete+code+sample+and+article可能会有所帮助。|985938|entityMap|0|LINK|mutability|MUTABLE|url|http://lance.bio/2017/09/27/selenium-on-javascript-new-wordpress-site-config-script/^0|0|1Q|V|0|0|0|0|1C|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|12|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|14|8|@]|9|@$D|15|E|16|1|17]]|A|$]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

The original question says clear() cannot be used. This does not apply to that situation. I'm adding my working example here as this SO post was one of the first Google results for clearing an input before entering a value.

For input where here is no additional restriction I'm including a browser agnostic method for Selenium using NodeJS. This snippet is part of a common library I import with <code>var test = require( 'common' );</code> in my test scripts. It is for a standard node module.exports definition.

<pre><code>when_id_exists_type : function( id, value ) {
driver.wait( webdriver.until.elementLocated( webdriver.By.id( id ) ) , 3000 )
 .then( function() {
 var el = driver.findElement( webdriver.By.id( id ) );
 el.click();
 el.clear();
 el.sendKeys( value );
 });
},
</code></pre>

Find the element, click it, clear it, then send the keys. 

<a href="http://lance.bio/2017/09/27/selenium-on-javascript-new-wordpress-site-config-script/" rel="nofollow noreferrer">This page has a complete code sample and article</a> that may help.

blocks|key|1200485|text|这是一件很容易做的事情，它对我很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1200486|//Create+a+Javascript+executor

JavascriptExecutor+jst=+(JavascriptExecutor)+driver;
jst.executeScript("arguments[1].value+=+arguments[0];+",+55,+driver.findElement(By.id("id")));|code-block|syntax|javascript|1200487|55+=赋值|1200488|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This is something easy to do and it worked for me:

<pre><code>//Create a Javascript executor

JavascriptExecutor jst= (JavascriptExecutor) driver;
jst.executeScript("arguments[1].value = arguments[0]; ", 55, driver.findElement(By.id("id")));
</code></pre>

55 = value assigned

blocks|key|1200503|text|+WebElement+p=+driver.findElement(By.id("your+id+name"));
+p.sendKeys(Keys.chord(Keys.CONTROL,+"a"),+"55");|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1200504|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> WebElement p= driver.findElement(By.id(&quot;your id name&quot;));
 p.sendKeys(Keys.chord(Keys.CONTROL, &quot;a&quot;), &quot;55&quot;);
</code></pre>

In WebDriver, if I use sendKeys it will append my string to the value that already exists in the field. I can't clear it by using clear() method because the second I do that, the webpage will throw an error saying that it has to be between 10 and 100. So I can't clear it or an error will be thrown before I can put in the new value using sendKeys, and if I sendKeys it just appends it to the value already there.

Is there anything in WebDriver that lets you overwrite the value in the field?

Selenium WebDriver: I want to overwrite value in field instead of appending to it with sendKeys using Java

在WebDriver中，如果我使用sendKeys，它会将我的字符串附加到字段中已经存在的值之后。我不能使用clear()方法清除它，因为一旦我这样做了，网页就会抛出一个错误，告诉它必须在10到100之间。所以我不能清除它，或者在我可以使用sendKeys放入新值之前抛出一个错误，如果我使用sendKeys，它只是将它附加到已经存在的值上。WebDriver中有没有什么东西可以让你覆盖字段中的值呢

问Selenium WebDriver:我希望重写字段中的值，而不是使用sendKeys使用Java将其追加到字段中
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问Selenium WebDriver:我希望重写字段中的值，而不是使用sendKeys使用Java将其追加到字段中
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