Html – How to force exact scale on ipad

htmlipadviewport

What I'm trying to achieve is: to force scale 1.0 when ipad is in landscape mode, and 0.75 when it's in portrait, but with disabled user scaling. I tried all combinations of meta viewport tag, and nothing worked:

when user-scalable is no, landscape works fine, but it doesn't scale to 0.75 in portrait, no matter how I set maximum and minimum scale
when user-scalable is yes, it works fine sometimes, but since there is lot of adding content with ajax, sometimes when page gets longer, the page just scales down to fit whole page on screen, and I want to prevent that

So, is there a way to force scaling to exact number? Or disable scaling when page length changes? (Page width should always be 1024px, no different css for different orientation and no width=device-width, I just need scaling)

Best Answer

Patrick's answer is def useful, here is a more tested version

var checkOrientation;
checkOrientation = function() {
  var viewport;
  viewport = document.querySelector("meta[name=viewport]");
  if (window.orientation === 90 || window.orientation === -90) {
    return viewport.setAttribute("content", "width:device-width, initial-scale=1.0, user-scalable=1");
  } else {
    return viewport.setAttribute("content", "width:device-width, initial-scale=0.6, user-scalable=1");
  }
};
window.onorientationchange = function() {
  return checkOrientation();
};
checkOrientation();

And don't forget to put this in your document's head:

<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">

Note that, one of the difference, is the commas instead of semi-colons in the arguments

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Html – How to horizontally center an element

You can apply this CSS to the inner <div>:

#inner {
  width: 50%;
  margin: 0 auto;
}

Of course, you don't have to set the width to 50%. Any width less than the containing <div> will work. The margin: 0 auto is what does the actual centering.

If you are targeting Internet Explorer 8 (and later), it might be better to have this instead:

#inner {
  display: table;
  margin: 0 auto;
}

It will make the inner element center horizontally and it works without setting a specific width.

Working example here:

#inner {
  display: table;
  margin: 0 auto;
  border: 1px solid black;
}

#outer {
  border: 1px solid red;
  width:100%
}

<div id="outer">
  <div id="inner">Foo foo</div>
</div>

EDIT

With flexbox it is very easy to style the div horizontally and vertically centered.

#inner {  
  border: 1px solid black;
}

#outer {
  border: 1px solid red;
  width:100%;
  display: flex;
  justify-content: center;
}

<div id="outer">
  <div id="inner">Foo foo</div>
</div>

To align the div vertically centered, use the property align-items: center.

Javascript – How to check whether a checkbox is checked in jQuery

How do I successfully query the checked property?

The checked property of a checkbox DOM element will give you the checked state of the element.

Given your existing code, you could therefore do this:

if(document.getElementById('isAgeSelected').checked) {
    $("#txtAge").show();
} else {
    $("#txtAge").hide();
}

However, there's a much prettier way to do this, using toggle:

$('#isAgeSelected').click(function() {
    $("#txtAge").toggle(this.checked);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="checkbox" id="isAgeSelected"/>
<div id="txtAge" style="display:none">Age is something</div>

Best Answer

Related Solutions

Html – How to horizontally center an element

EDIT

Javascript – How to check whether a checkbox is checked in jQuery

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