無法在Python中使用Selenium選擇下拉菜單

Question

我無法在此網頁中選擇Selenium（python）中的自動化特定元素。

這兩個字段，從網頁上當，目前我正在尋找的東西：

當我右鍵點擊，點擊「檢查元素」，我發現下面的HTML標記（好了，它的一個子集）：

<label>Client ID:</label> 
<db-client-combobox default-value="vm.clientId" on-select="vm.onClientSelected(clientId)" class="ng-isolate-scope"> 
    <db-combobox placeholder="Select a client" list="clientNames" default-value="defaultValue" on-select="onClientSelected(value)" mode="longlist" class="ng-isolate-scope"> 
     <div class="input-group combobox dropdown"> 
      <input type="text" class="form-control ng-pristine ng-valid ng-touched" placeholder="Select a client" data-toggle="dropdown" ng-model="itemSelected" ng-change="onInputKeyUp()" ng-focus="onInputFocus()" aria-expanded="false"> 
      <span class="input-group-addon dropdown-toggle btn" id="combobox-list" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true"> 
<span class="caret"></span> 
      </span> 
      <ul class="dropdown-menu" aria-labelledby="combobox-list"> 
       <!-- ngIf: mode == 'longlist' --> 
       <div class="sf-viewport sf-viewport-biglist real ng-scope" ng-if="mode == 'longlist'" style="overflow: auto; max-height: 300px;"> 
        <div style="margin: 0px; padding: 0px; border: 0px; box-sizing: border-box; height: 67912px;"> 
        </div> 
       </div> 
       <!-- end ngIf: mode == 'longlist' --> 
       <!-- ngIf: mode == 'shortlist' --> 
      </ul> 
     </div> 
    </db-combobox> 
</db-client-combobox> 
</div> &nbsp; 
<div class="form-group"> 
    <label>Agent ID:</label> 
    <input type="text" class="form-control js-call-type ng-pristine ng-valid ng-touched" ng-model="vm.agentId"> 
</div> 

「客戶端ID」字段既是一個下拉列表，文本字段（它是由用戶選擇是否說用戶要輸入客戶ID或選擇它從一個下拉菜單中）。 代理商ID只是一個輸入數字的文本字段。

我似乎無法在Selenium中選擇。選擇客戶端ID，例如，我已經試過以下Python命令（單獨）：

client_id_field = browser.find_elements_by_css_selector('select') 
client_id_field = browser.find_element_by_css_selector("input.form-control ng-pristine ng-valid ng-touched") 
client_id_field = browser.find_element_by_css_selector("input.form-control.ng-pristine.ng-valid.ng-touched") 
client_id_field = browser.select_by_xpath('/html/body/div[1]/div/div[1]/div/div/div[1]/db-client-combobox/db-combobox/div/input') 
client_id_field = browser.select_by_class_name('form-control ng-pristine ng-valid ng-touched') 

可悲的是，似乎沒有任何工作，我不知道爲什麼。我看到的唯一的另一種可能性是選擇標籤，即<label>Client ID:</label>，然後告訴解釋器轉到下一個元素並選擇 - 儘管我不確定正確的語法是什麼。

任何人都可以幫忙嗎？

UPDATE：以下alecxe的建議後，試圖將

client_id_box = browser.find_element_by_xpath("//label[. = 'Client ID:']/following-sibling::db-client-combobox") 

我得到了在命令行提示符下輸入下面的錯誤：

selenium.common.exceptions.NoSuchElementException: Message: {"errorMessage":"Una 
ble to find element with xpath '//label[. = 'Client ID:']/following-sibling::db- 
client-combobox'","request":{"headers":{"Accept":"application/json","Accept-Enco 
ding":"identity","Connection":"close","Content-Length":"147","Content-Type":"app 
lication/json;charset=UTF-8","Host":"127.0.0.1:53214","User-Agent":"Python-urlli 
b/2.7"},"httpVersion":"1.1","method":"POST","post":"{\"using\": \"xpath\", \"ses 
sionId\": \"d67f3550-e736-11e6-a1df-2f9c010cd01f\", \"value\": \"//label[. = 'Cl 
ient ID:']/following-sibling::db-client-combobox\"}","url":"/element","urlParsed 
":{"anchor":"","query":"","file":"element","directory":"/","path":"/element","re 
lative":"/element","port":"","host":"","password":"","user":"","userInfo":"","au 
thority":"","protocol":"","source":"/element","queryKey":{},"chunks":["element"] 
},"urlOriginal":"/session/d67f3550-e736-11e6-a1df-2f9c010cd01f/element"}} 
Screenshot: available via screen 

東西讓我覺得奇怪的（對不起，如果這聽起來很幼稚）是命令行表示unable to find element with xpath...，然後在列出我要求的xpath之後，它還列出了許多我不想要求的術語。我沒有充分利用解釋器的調試響應嗎？

Answer 1

我看到的唯一的另一種可能性是選擇標籤，即客戶端ID：然後告訴解釋器轉到下一個元素並選擇 - 雖然我不確定正確的語法是什麼。

這可以用following-sibling axis來實現：

client_id_box = browser.find_element_by_xpath("//label[. = 'Client ID:']/following-sibling::db-client-combobox") 

然後，一旦你在客戶ID框元素，你可以找到內輸入：

client_id_input = client_id_box.find_element_by_tag_name("input") 
client_id_input.click() # TODO: you might not need it, please check 
client_id_input.send_keys("Test") 

對於下拉列表中，您首先可能需要打開它，然後選擇所需的選項：

client_id_box.find_element_by_id("combobox-list").click() # open the dropdown 
# TODO: select option 

請注意，爲了使事情更可靠並避免計時錯誤，您可能需要開始使用Explicit Waits。