这是我用来获取具有特定href值的元素的代码：
var myElement = $("a[href='http://www.stackoverflow.com']");
我想只获得类标题的元素。我尝试了这个，但它没有用。
var myElement = $(".title, a[href='http://www.stackoverflow.com']");
知道我错过了什么吗？
答案 0 :(得分：2)
摆脱,并使用像
var myElement = $("a.title[href='http://www.stackoverflow.com']");
上方选择器会选择a class .title href个,的所有a代码。
您的选择器失败的原因是，当您使用href时，它将选择具有.title值的所有a.title标记以及具有a类的所有元素不是你想要的。因此，我们编写title，只有package coin.asiannews;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Random;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.AlertDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.FrameLayout;
import android.widget.ListView;
import coin.asiannews.utils.ShakeDetector;
import coin.asiannews.utils.ShakeDetector.OnShakeListener;
/** Extend from this Activity to display the navigation drawer on the left side
*
* @author Pixelart Web and App Development
*/
public class BaseActivity extends ActionBarActivity{
DrawerLayout mDrawerLayout;
View devi;
ListView mDrawerList;
ActionBarDrawerToggle mDrawerToggle;
protected FrameLayout contentLayout;
int id = 0;
ArrayList<String> idList;
AlertDialog ad;
boolean isTablet = false;
/** Set The ContentView and the position in the menu list
*
* @param layoutResID
* @param position
*/
public void setContentView(final int layoutResID, int id) {
this.id = id;
devi = (View) getLayoutInflater().inflate(R.layout.activity_base, null);
Toolbar toolbar = (Toolbar) devi.findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mDrawerLayout= (DrawerLayout) devi.findViewById(R.id.drawer_layout);
contentLayout= (FrameLayout) devi.findViewById(R.id.content_frame);
getLayoutInflater().inflate(layoutResID, contentLayout, true);
super.setContentView(devi);
// Set this to true to display an icon or logo
getSupportActionBar().setDisplayShowHomeEnabled(true);
// Set this to false to hide text title
getSupportActionBar().setDisplayShowTitleEnabled(true);
if(((ViewGroup.MarginLayoutParams)contentLayout.getLayoutParams()).leftMargin == 240) {
isTablet = true;
supportInvalidateOptionsMenu();
}else {
isTablet = false;
supportInvalidateOptionsMenu();
}
if(isTablet) {
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_OPEN);
mDrawerLayout.setScrimColor(getResources().getColor(R.color.transparent));
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
getSupportActionBar().setHomeButtonEnabled(false);
}else if(!isTablet) {
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, toolbar, R.string.drawer_open,
R.string.drawer_close) {
public void onDrawerClosed(View view) {
supportInvalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
supportInvalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerToggle.setDrawerIndicatorEnabled(true);
}
mDrawerList = (ListView) findViewById(R.id.left_drawer);
String[] menu = getResources().getStringArray(R.array.menu);
mDrawerList.setAdapter(new ArrayAdapter<String>(this, R.layout.row_drawer_menu, menu));
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
mDrawerList.setItemChecked(id, true);
SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(BaseActivity.this);
if(pref.getBoolean("isDeviceShake", true) == true){
ShakeDetector.create(this, new OnShakeListener() {
public void OnShake() {
randomPost();
}
});
}
}
public void setItemChecked() {
mDrawerList.setItemChecked(id, true);
}
@Override
public void onResume(){
super.onResume();
ShakeDetector.start();
mDrawerList.setItemChecked(id, true);
}
@Override
protected void onStop() {
super.onStop();
ShakeDetector.stop();
}
@Override
protected void onDestroy() {
super.onDestroy();
ShakeDetector.destroy();
}
public void displayDrawerToggle(boolean ddt) {
if(ddt) {
mDrawerToggle.setDrawerIndicatorEnabled(true);
}else if(!ddt) {
mDrawerToggle.setDrawerIndicatorEnabled(false);
}
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
if(!isTablet) {
mDrawerToggle.syncState();
}
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if(!isTablet) {
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (!isTablet && mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
return true;
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
return true;
}
private class DrawerItemClickListener implements ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
switch (position) {
case 0:
Intent latest = new Intent(BaseActivity.this, LatestPosts.class);
startActivity(latest);
if(!isTablet) {
mDrawerLayout.closeDrawer(mDrawerList);
}
break;
case 1:
Intent categories = new Intent(BaseActivity.this, CategoriesIndex.class);
startActivity(categories);
if(!isTablet) {
mDrawerLayout.closeDrawer(mDrawerList);
}
break;
case 2:
Intent page = new Intent(BaseActivity.this, PageActivity.class);
startActivity(page);
if(!isTablet) {
mDrawerLayout.closeDrawer(mDrawerList);
}
break;
case 3:
Intent bookmarks = new Intent(BaseActivity.this, BookmarkPosts.class);
startActivity(bookmarks);
if(!isTablet) {
mDrawerLayout.closeDrawer(mDrawerList);
}
break;
case 4:
Intent settings = new Intent(BaseActivity.this, SettingsActivity.class);
startActivity(settings);
if(!isTablet) {
mDrawerLayout.closeDrawer(mDrawerList);
}
break;
}
} };
/**
* RANDOM POST FUNCTIONS
*/
private void randomPost() {
LayoutInflater inflater = getLayoutInflater();
View dialoglayout = inflater.inflate(R.layout.dialog_shake, null);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setView(dialoglayout);
ad = builder.create();
ad.show();
String param = "/get_posts/?include=id&count=999999";
String api = getString(R.string.api);
String url = getString(R.string.blogurl);
url = url+api+param;
new GetIdsTask().execute(url);
}
private class GetIdsTask extends AsyncTask<String, Integer, Void> {
@Override
protected void onProgressUpdate(Integer... values) {
}
@Override
protected void onPostExecute(Void result) {
if (null != idList) {
Random r = new Random();
int index = r.nextInt(idList.size());
String pId = idList.get(index);
fetchPost(pId);
}
}
@Override
protected Void doInBackground(String... params) {
String url = params[0];
JSONObject json = getJSONFromUrl(url);
try {
if (json.getString("status").equalsIgnoreCase("ok")) {
JSONArray posts = json.getJSONArray("posts");
idList = new ArrayList<String>();
for (int i = 0; i < posts.length(); i++) {
JSONObject post = (JSONObject) posts.getJSONObject(i);
String id = post.getString("id");
idList.add(id);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
}
public JSONObject getJSONFromUrl(String url) {
InputStream is = null;
JSONObject jObj = null;
String json = null;
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
jObj = new JSONObject(json);
} catch (JSONException e) {}
return jObj;
}
private void fetchPost(String id) {
String url = getString(R.string.blogurl);
String api = getString(R.string.api);
String include = getString(R.string.include);
String param = "/get_post/?id="+id+"&include="+include;
url = url+api+param;
new GetPostTask().execute(url);
}
private class GetPostTask extends AsyncTask<String, Integer, Void> {
String[] postData;
@Override
protected void onProgressUpdate(Integer... values) {
}
@Override
protected void onPostExecute(Void result) {
Intent intent = new Intent(BaseActivity.this, PostDetails.class);
intent.putExtra("post_url", postData[0]);
intent.putExtra("post_title", postData[1]);
intent.putExtra("post_id", postData[2]);
intent.putExtra("post_com_status", postData[3]);
intent.putExtra("post_author", postData[4]);
startActivity(intent);
ad.cancel();
}
@Override
protected Void doInBackground(String... params) {
String url = params[0];
JSONObject json = getJSONFromUrl(url);
try {
if (json.getString("status").equalsIgnoreCase("ok")) {
JSONObject post = json.getJSONObject("post");
String id = post.getString("id");
String title = post.getString("title");
String uri = post.getString("url");
String com_status = post.getString("comment_status");
JSONObject aut = post.getJSONObject("author");
String author = aut.getString("name");
String[] postData = { uri, title, id, com_status, author, };
this.postData = postData;
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
}
}
类才会选择String。
答案 1 :(得分：1)
您可以使用 href =＆＃39; http://www.stackoverflow.com＆＃39;
来获取所有 .titlevar myElement = $("a[href='http://www.stackoverflow.com'].title");
班级选择器（“.class”）https://api.jquery.com/class-selector/