report & column width fixed in oracle apex

Advanced --> Custom Attributes
forms column -- 
style="display:block;width:250px"

report item ---
<span style="display:block; width:200px">#COLUMN_NAME_OF_REPORT#</span>

#P75_DIVISION1,#P75_DISTRICT1{
   width: 40% !important;    
}

#P75_REGION_LIST{
   width: 15.5% !important;    

}

Position items next to each other in oracle apex

1. Function and Global Variable Declaration

/*
 * Dick Dral - Detora @ 2016
 */

/*  Removes the class col-1, col-2 etc. from the div.
 *  This removes the fixed width from the div which gets its
 *  it's width from the content then
 */
function remove_col_x_class( div )
{
  for ( i = 1; i <= 12 ; i++ )
  { $(div).removeClass('col-'+i); }
  return div;
}


/* This function returns the label or input container of an Apex item.
 * These divs can be used to put content on one line.
 */
function get_container_div ( colname, type )
{
  type = ( type.toLowerCase() == 'label' ) ? 'label' : 'input';
  var div = $('#'+colname.toUpperCase()+'_CONTAINER .t-Form-'+type+'Container');
  return div;
}

function position_after ( itemName1, itemName2 )
{
  input1 = remove_col_x_class( get_container_div(itemName1,'input') );
  label2 = remove_col_x_class( get_container_div(itemName2,'label') );
  input2 = remove_col_x_class( get_container_div(itemName2,'input') );
  $(label2).insertAfter( $(input1) );
  $(input2).insertAfter( $(label2) );

}

.2. Execute when Page Loads

position_after('P87_NEW_2','P87_NEW_3');

New Feature in Oracle Apex 19.1

1) New Page Region Type: Form Region

i) Source = Table, SQL based, or PL/SQL returning SQL Query

ii) Page Item Source references Form Region (not Table synchronizes Page Items with Form Query

3) Write data using REST Enabled SQL

4) REST Enabling Database Objects

5) Improve Data Loading

6) APEX_DATA_PARSER

7) Oracle JET 6.1.0

8) Status Meter Gauge (Replaces Dial Gauges)

9) Enhancement in Interactive Grids like Flashback etc.

10) Dynamic Actions – Addition of actions to open/close regions

11) App Builder Authentication – Can now use Social Login

12) Improved Translation Editing

Read only or disable a Datepicker field but Enable Date Icon in Oracle apex

Date item Properties 

Advanced

Custom Attributes  :   readonly="readonly"  or disabled="disabled"  or  just disabled

 Layout

or Custom Attributes:  onkeydown="return false"

Prevent a duplicate page submit in oracle apex

1. Prevent duplicate page  using java-scripts
2. Prevent duplicate page using button disabled
3. Prevent duplicate page using page setting no

• Before Page Submit
• Execute java scripts code

$("body").append('<div class="ui-widget-overlay ui-front"/>');
apex.widget.waitPopup();
////

$("body").append('<div class="ui-widget-overlay ui-front"/>'); apex.widget.waitPopup();

Multiple Oracle APEX sessions in a browser

1. Open hosts  file
C:\Windows\System32\drivers\etc
2.
10.10.17.21      apexdev01       
10.10.17.21      apexdev02     
10.10.17.21      apexdev03     

http://apexdev01:8181/apex/f?p=4000:1
http://apexdev02:8181/apex/f?p=4000:2
http://apexdev03:8181/apex/f?p=4000:3