R - Rselenium - 导航下拉菜单/列表/框使用='id' [英] R - Rselenium - navigate drop down menu / list / box using = 'id'
问题描述
如何通过using =id导航动态下拉列表（例如， remDr $ findElement（using ='id'，value =main_ddYear）？
How can I navigate a dynamic drop down list via " using = 'id' " (e.g., remDr$findElement(using='id', value="main_ddYear") ?
我可以找到并点击使用 findElement 。点击后可以发送向下箭头键击键）和输入，如果我知道我的目标选择是多少箭头。
I can find and click using findElement. After clicking I could send "down arrow" keys (keystrokes) and an "enter" if I know how many arrows down my targeted selection is.
页面来源的示例
<select name="main$ddYear" onchange="javascript:setTimeout('__doPostBack(\'main$ddYear\',\'\')', 0)" id="main_ddYear" class="groupTextBox">
<option selected="selected" value="2017">2017</option>
<option value="2016">2016</option>
<option value="2015">2015</option>
<option value="2014">2014</option>
<option value="2013">2013</option>
</select>
我想做som道德类似于这篇文章的解决方案，但使用'id'而不是'xpath'。我无法适应xpath解决方案。
I would like to do something similar to the solution in this post but with 'id' instead of 'xpath' . I could not adapt the xpath solution.
Java中的另一个解决方案使用我没有找到的选择类，在快速入门教程或文档。
Another solution in Java used a "Select" class which I did not find referenced in the quick start tutorial or documentation.
我将发布一个单独的问题，关于如何清除选项/值的下拉列表。
I will post a separate question about how to scrape the drop down list of options / values.
推荐答案
有关XPath的一些了解，适应使用XPath的链接解决方案应该很简单，例如：
With a little knowledge about XPath, adapting the linked solution which using XPath for your case should be straightforward, for example :
option <- remDr$findElement(using = 'xpath', "//select[@id='main_ddYear']/option[@value='2014']")
option$clickElement()
关于XPath的简要说明：
-
//选择[@ id ='main_ddYear']在HTML中的任何位置查找< select>元素，其中id属性值等于main_ddYear' -
/ option [@value ='2014']：从这样的< select>元素，返回child< option>其中value属性值等于'2014'。
//select[@id='main_ddYear']: Find<select>element, anywhere in the HTML, whereidattribute value equals'main_ddYear'/option[@value = '2014']: From such<select>element, return child<option>wherevalueattribute value equals'2014'.
这篇关于R - Rselenium - 导航下拉菜单/列表/框使用='id'的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
