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"Can't set headers after they are sent" and empty post request body
Web Development

I've been following a tutorial for a login/register authentication application. I keep getting the error "Can't set headers after they are sent" whenever I send POST requests. I tried to console.log the request body and it were empty. I don't know where I did wrong. Please help.

users.js

var express = require('express');
var router = express.Router();
va

i need to print the sum of counters of unread note for more than one if i have 2 or more person
Web Development

this code shows to me every student that do not read the notes so I need the counter of these unread to print it how can get the sum of all unread notes ?

 $query=mysql_query("SELECT * FROM students WHERE
parents_id='".$pid."'");
while($r=mysql_fetch_assoc($query)){
echo'<tr>';
echo'<td><b>'.$r['first_name'].'  '.
$r['last_name'].'</b></td>';
echo'

Android sqlite database query with the columns needed taken from a String[]
Web Development

I have string array with columns I want to select:

String[] columns = {"col1", "col2", "col3"};

The columns might change in the future, but will always be a subset of available columns.

I cannot find a SQLiteDatabase API that lets me pass this array as columns. The only solution I have so far is to just string join the columns with ,<


Trying to post a variable from js to php within a if clause
Web Development

I am trying to post a variable within a if clause, but the php document is not receiving the variable. Here is some Code:

JS:

if(data.details.payment_type =="sofo")    {
    var orderid = data.details.order_id;
    $.post("LinkToPhpDocument.php", { orderidvalue: orderid });
    window.location.replace("LinkToPhpDocument.php");
}

PHP

$or

Data Binding for alternative layouts
Web Development

I have faced with an issue with data binding for different layouts. I have layout file for different orientation. For portrait mode:

<layout
xmlns:android="http://schemas.android.com/apk/res/android">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <FrameLayout
        android

Android: ThumbnailUtils.createVideoThumbnail return black bitmap
Web Development

I am dealing with the thumbnail in Android. Even though I use the function ThumbnailUtils.createVideoThumbnail provided by Android, it gets black bitmap.

I start my research and find out some links:
1/ Thumbnail null
2/ Spring Batch Multiple Processors

Web Development

Can we have multiple processors and single writer to write data in two different tables in spring batch


Update Datalist after a Button is pressed in Android
Web Development

I have a list of T-objects. Each of this objects has a list of S-objects. I want to show the List<S>-data. That for I am using nested RecyclerView.

Since I want to change the data of the S-objects at runtime I use EditText to show and edit the data.

When a button is pressed I want to save all c


How to send complex JSON structure from angular to spring controller
Web Development

I've a JSON like below in my angular controller, which i need to post to Spring controller.

var items={"A":"aa",
           "B":"bb",
           "C":{"D":"dd", "E":"ee"}
           };

$http.post('localhost:8082/ProjectName/posting',items)
.success(function(data,status,headers, config){
   alert("success");
})
.error(function(error){
    alert(error);
});

In my


Inno Setup: Do not install subfolder if it exists already
Web Development

I am trying to package everything in C:AppWeb* into an installer.

If the database sub-folder mysqldata exists, then I do not want to replace these files.

This is my Inno Setup script:

[Files]
Source: "C:AppWebxampp-control.exe"; DestDir: "{app}"; Flags:    
ignoreversion
Source: "C:AppWeb*"; DestDir: "{app}"; Flags: ign

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