Author: Admin

if(typeof variable_here === 'undefined'){
   // your code here.
 };

To scroll down to an element in the page. The best way is to use function scrollIntoView

Pure javascript

var theElement = document.getElementById(‘yourElementId’);
theElement.scrollIntoView();

Using jquery to select element:

$(SELECTOR)[0].scrollIntoView();

open php.ini and uncomment, modify, add these lines

[XDebug]
zend_extension = “C:xamppphpextphp_xdebug.dll”
;xdebug.profiler_append = 0
;xdebug.profiler_enable = 1
;xdebug.profiler_enable_trigger = 0
;xdebug.profiler_output_dir = “C:xampptmp”
;xdebug.profiler_output_name = “cachegrind.out.%t-%s”
xdebug.remote_enable = 1
xdebug.remote_handler = “dbgp”
xdebug.remote_host = “127.0.0.1”
xdebug.remote_port=9000
xdebug.remote_mode=req
xdebug.idekey=”netbeans-xdebug”
;xdebug.trace_output_dir = “C:xampptmp”

make sure the line “zend_extension…” is uncommented andxdebug.remote_enable is set to 1.

xdebug.idekey should be set to be the same as Netbeans’ PHP debug setting, by default it’s “netbeans-xdebug”. Same for remote_port and remote_mode.

When developing android app that sends requests to a web service written in PHP, we need to configure XDebug and Netbeans to break when an external request(from an Android app, for example) is sent.

Modify php.ini:

xdebug.remote_autostart = 1
xdebug.idekey=”netbeans-xdebug”

In Netbeans, debug a random file, click continue when it breaks at initial breakpoint.

Run the Android app, Netbeans will break when the app sends a request to the php page.

Let’s say you have a checkbox like the following

<input type=”checkbox” id=”leCheckBox”>

To check if it’s checked or not, use:

var leCheckBoxIsChecked = $(“#leCheckBox:checked”).length>0;

It will returns true if the checkbox is checked and false otherwise.

To check the checkbox programmatically:

$(“#leCheckBox”).prop(“checked”, “true”);

To uncheck the checkbox programmatically:

$(“#leCheckBox”).removeAttr(“checked”)

Tips for debugging PHP PDO statements:

get the return value of $statement->execute(). It returns true on success and false on failure.

use $statement->errorInfo(), to find out exactly the error in the query.

Make use of xdebug and netbeans’ debugging capability.

Configure PDO to throw exception when errors occur

$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 

1.Enable page output caching.

2. web gardening is not supported by Sharepoint, so don’t enable it.

Don’t use cached labels in any way.

Check whether there are overflows in div tags. Use your finger to scroll on different areas to determine the element that has overflow.

Add style overflow:hidden to the tags that have overflow to fix this problem.