Detect Viewport Orientation, If Orientation Is Portrait Display Alert Message Advising User of Instructions

Detect viewport orientation, if orientation is Portrait display alert message advising user of instructions

if(window.innerHeight > window.innerWidth){
    alert("Please use Landscape!");
}

jQuery Mobile has an event that handles the change of this property... if you want to warn if someone rotates later - orientationchange

Also, after some googling, check out window.orientation (which is I believe measured in degrees...)

EDIT: On mobile devices, if you open a keyboard then the above may fail, so can use screen.availHeight and screen.availWidth, which gives proper height and width even after the keyboard is opened.

if(screen.availHeight > screen.availWidth){
    alert("Please use Landscape!");
}

Detect viewport orientation, if orientation is Portrait display alert message advising user of instructions

if(window.innerHeight > window.innerWidth){
    alert("Please use Landscape!");
}

jQuery Mobile has an event that handles the change of this property... if you want to warn if someone rotates later - orientationchange

Also, after some googling, check out window.orientation (which is I believe measured in degrees...)

EDIT: On mobile devices, if you open a keyboard then the above may fail, so can use screen.availHeight and screen.availWidth, which gives proper height and width even after the keyboard is opened.

if(screen.availHeight > screen.availWidth){
    alert("Please use Landscape!");
}

Detect viewport orientation, if orientation is Portrait display alert message advising user of instructions

if(window.innerHeight > window.innerWidth){
    alert("Please use Landscape!");
}

jQuery Mobile has an event that handles the change of this property... if you want to warn if someone rotates later - orientationchange

Also, after some googling, check out window.orientation (which is I believe measured in degrees...)

EDIT: On mobile devices, if you open a keyboard then the above may fail, so can use screen.availHeight and screen.availWidth, which gives proper height and width even after the keyboard is opened.

if(screen.availHeight > screen.availWidth){
    alert("Please use Landscape!");
}

Detect device orientation

set a div with a class for the image

<div class="img_a">

Then define the CSS rules for the required images according to orientation or any other media queries you might need to implement

@media screen and (orientation: portrait)
  { div.img_a 
      { background: url(https://[...]img_a.jpg) no-repeat fixed; }
  [...] }
@media screen and (orientation: landscape)
  { div.img_a 
      { background: url(https://[...]img_a_horizontal.jpg) no-repeat fixed; }
  [...] }

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