Question

我有如下所示的HTML

from googleapiclient.discovery import build
from httplib2 import Http
from oauth2client import file, client, tools

SCOPES = 'https://www.googleapis.com/auth/gmail.readonly'

def main():

    store = file.Storage('token.json')
    creds = store.get()
if not creds or creds.invalid:
    flow = client.flow_from_clientsecrets('credentials.json', SCOPES)
    creds = tools.run_flow(flow, store)
service = build('gmail', 'v1', http=creds.authorize(Http()))

# Call the Gmail API to fetch INBOX
results = service.users().messages().list(userId='me',maxResults=20,labelIds = ['INBOX']).execute()
messages = results.get('messages', [])

if not messages:
    print("No messages found.")
else:
    print("Message snippets:")
    for message in messages:
        msg = service.users().messages().get(userId='me', id=message['id']).execute()
        print(msg['snippet'])

if __name__ == '__main__':
    main()

我试图通过内部span元素的内部文本找到li元素。

例如：路由器具有li元素ID-tab_1

我尝试使用以下jquery代码，但无法正常工作并返回空

import { NgModule } from '@angular/core';
import { Routes } from '@angular/router';

import { NativeScriptRouterModule } from 'nativescript-angular/router';

import { GuardService } from './services/guard.service'

import { LoginComponent } from '~/pages/login/login.component';
import { PhrasesComponent } from '~/pages/phrases/phrases.component';
import { HomeComponent } from '~/pages/home/home.component';
import { OrderComponent } from '~/pages/order/order.component';
import { FinishComponent } from '~/pages/finish/finish.component';
import { PendingComponent } from '~/pages/pending/pending.component';

const routes: Routes = [
    { path: '', redirectTo: '/home', pathMatch: 'full' },
    { path: 'login', component: LoginComponent },
    { path: 'phrases', component: PhrasesComponent },
    { path: 'home', component: HomeComponent, canActivate: [GuardService] },
    { path: 'order/:id', component: OrderComponent, canActivate: [GuardService] },
    { path: "finish/:id", component: FinishComponent, canActivate: [GuardService] },
    { path: "pending/:id", component: PendingComponent, canActivate: [GuardService] }
];

@NgModule({
    imports: [NativeScriptRouterModule.forRoot(routes)],
    exports: [NativeScriptRouterModule]
})
export class AppRoutingModule { }

还有其他方法吗？

Answer 1

问题出在您的选择器上。 k-item tabClick k-state-default类之间有空格，应该在其中将它们与class选择器前缀的句点分隔符连接在一起。然后，将选择span。要从中获取li，可以使用closest()：

var $span = $('li.k-item.tabClick.k-state-default span.k-link:contains("Router")');

var $li = $span.closest('li');
$li.css('color', '#C00');

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<ul id="tabStripSecondaryElements" class="k-tabstrip-items k-reset" data-role="tabstrip" style="margin-left: 37px; margin-right: 40px;" role="tablist" aria-activedescendant="tab_0">
  <li class="k-item tabClick k-state-default k-first" id="tab_1" value="1" role="tab" aria-controls="tabStripSecondaryElements-1">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Automobile&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_3" value="3" role="tab" aria-controls="tabStripSecondaryElements-2">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Router&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_4" value="4" role="tab" aria-controls="tabStripSecondaryElements-3">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Smart City Sensor&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_5" value="5" role="tab" aria-controls="tabStripSecondaryElements-4">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      ZigBee Power Cable&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_6" value="6" role="tab" aria-controls="tabStripSecondaryElements-5">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Tracker&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_7" value="7" role="tab" aria-controls="tabStripSecondaryElements-6">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Fleet Intelligence&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_8" value="8" role="tab" aria-controls="tabStripSecondaryElements-7">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Mobile&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_9" value="9" role="tab" aria-controls="tabStripSecondaryElements-8">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Double Door&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_87" value="87" role="tab" aria-controls="tabStripSecondaryElements-10">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Test&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>

</ul>

作为避免使用closest()的替代方法，您可以使用:has直接选择li：

var $li = $('li.k-item.tabClick.k-state-default:has(span.k-link:contains("Router"))');
$li.css('color', '#C00');

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<ul id="tabStripSecondaryElements" class="k-tabstrip-items k-reset" data-role="tabstrip" style="margin-left: 37px; margin-right: 40px;" role="tablist" aria-activedescendant="tab_0">
  <li class="k-item tabClick k-state-default k-first" id="tab_1" value="1" role="tab" aria-controls="tabStripSecondaryElements-1">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Automobile&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_3" value="3" role="tab" aria-controls="tabStripSecondaryElements-2">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Router&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_4" value="4" role="tab" aria-controls="tabStripSecondaryElements-3">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Smart City Sensor&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_5" value="5" role="tab" aria-controls="tabStripSecondaryElements-4">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      ZigBee Power Cable&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_6" value="6" role="tab" aria-controls="tabStripSecondaryElements-5">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Tracker&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_7" value="7" role="tab" aria-controls="tabStripSecondaryElements-6">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Fleet Intelligence&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_8" value="8" role="tab" aria-controls="tabStripSecondaryElements-7">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Mobile&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_9" value="9" role="tab" aria-controls="tabStripSecondaryElements-8">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Double Door&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>
  <li class="k-item tabClick k-state-default" id="tab_87" value="87" role="tab" aria-controls="tabStripSecondaryElements-10">
    <span class="k-loading k-complete"></span>
    <span unselectable="on" class="k-link"> 
      Test&nbsp;&nbsp;&nbsp;
      <span class="fa fa-ellipsis-v"></span>
    </span>
  </li>

</ul>

Answer 2

如果您对纯JavaScript 方法感兴趣，则可以使用 textContent 属性从每个li元素内部检索文本然后使用 indexOf() 方法检查元素的文本是否包含字符串。

var x = document.querySelectorAll(".k-item.tabClick.k-state-default");

x.forEach(li => {
  if(li.textContent.indexOf("Router") != -1){
    li.style.color = "red";
    return li;
  }
});

您可以通过仅将一个字符串作为参数并将每个元素的文本内容与该字符串进行比较，来使一个可重复使用的函数checkText()用于检查不同的字符串。

检查并运行下面的代码段，以获取此可重用功能的实际示例：

/* JavaScript */

var x = document.querySelectorAll(".k-item.tabClick.k-state-default");

function checkText(e) {
  x.forEach(li => {
    if(li.textContent.indexOf(e) != -1){
      console.log(e + " is found and has been marked red!!");
      li.style.color = "red";
      return li;
    }
  });
}

checkText("Router");
checkText("Mobile");

<!-- HTML -->

<ul id="tabStripSecondaryElements" class="k-tabstrip-items k-reset" data-role="tabstrip" style="margin-left: 37px; margin-right: 40px;" role="tablist" aria-activedescendant="tab_0">
   <li class="k-item tabClick k-state-default k-first" id="tab_1" value="1" role="tab" aria-controls="tabStripSecondaryElements-1"><span class="k-loading k-complete"></span><span unselectable="on" class="k-link"> Automobile&nbsp;&nbsp;&nbsp;<span class="fa fa-ellipsis-v"></span></span></li>
   <li class="k-item tabClick k-state-default" id="tab_3" value="3" role="tab" aria-controls="tabStripSecondaryElements-2"><span class="k-loading k-complete"></span><span unselectable="on" class="k-link"> Router&nbsp;&nbsp;&nbsp;<span class="fa fa-ellipsis-v"></span></span></li>
   <li class="k-item tabClick k-state-default" id="tab_4" value="4" role="tab" aria-controls="tabStripSecondaryElements-3"><span class="k-loading k-complete"></span><span unselectable="on" class="k-link"> Smart City Sensor&nbsp;&nbsp;&nbsp;<span class="fa fa-ellipsis-v"></span></span></li>
   <li class="k-item tabClick k-state-default" id="tab_5" value="5" role="tab" aria-controls="tabStripSecondaryElements-4"><span class="k-loading k-complete"></span><span unselectable="on" class="k-link"> ZigBee Power Cable&nbsp;&nbsp;&nbsp;<span class="fa fa-ellipsis-v"></span></span></li>
   <li class="k-item tabClick k-state-default" id="tab_6" value="6" role="tab" aria-controls="tabStripSecondaryElements-5"><span class="k-loading k-complete"></span><span unselectable="on" class="k-link"> Tracker&nbsp;&nbsp;&nbsp;<span class="fa fa-ellipsis-v"></span></span></li>
   <li class="k-item tabClick k-state-default" id="tab_7" value="7" role="tab" aria-controls="tabStripSecondaryElements-6"><span class="k-loading k-complete"></span><span unselectable="on" class="k-link"> Fleet Intelligence&nbsp;&nbsp;&nbsp;<span class="fa fa-ellipsis-v"></span></span></li>
   <li class="k-item tabClick k-state-default" id="tab_8" value="8" role="tab" aria-controls="tabStripSecondaryElements-7"><span class="k-loading k-complete"></span><span unselectable="on" class="k-link"> Mobile&nbsp;&nbsp;&nbsp;<span class="fa fa-ellipsis-v"></span></span></li>
   <li class="k-item tabClick k-state-default" id="tab_9" value="9" role="tab" aria-controls="tabStripSecondaryElements-8"><span class="k-loading k-complete"></span><span unselectable="on" class="k-link"> Double Door&nbsp;&nbsp;&nbsp;<span class="fa fa-ellipsis-v"></span></span></li>
   <li class="k-item tabClick k-state-default" id="tab_87" value="87" role="tab" aria-controls="tabStripSecondaryElements-10"><span class="k-loading k-complete"></span><span unselectable="on" class="k-link"> Test&nbsp;&nbsp;&nbsp;<span class="fa fa-ellipsis-v"></span></span></li>

</ul>

通过内部跨度的内部文本查找li元素

2 个答案: