Mese: Maggio 2022

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tables and small screens

Tables, mainly if with more than two columns, are badly rendered on small screens (smartphones, tablets and the like). Indeed, not only they are unreadable, but they mess up the whole page, making it unreadable on small screens.

Therefore the best would be avoid as possible tables used as layout or even concept map.

The only tables you should use are for data (as from a database). In these cases you can use this helpful css code:

 <style type="text/css">
 /*<![CDATA[*/
 table {
  border: 1px solid #ccc;
  border-collapse: collapse;
  margin: 0;
  padding: 0;
  width: 100%;
  table-layout: fixed;
 }

 table caption {
  font-size: 1.5em;
  margin: .5em 0 .75em;
 }

 table tr {
  background-color: #f8f8f8;
  border: 1px solid #ddd;
  padding: .35em;
 }

 table th,
 table td {
  padding: .625em;
  text-align: center;
 }

 table th {
  font-size: .85em;
  letter-spacing: .1em;
  text-transform: uppercase;
 }

 @media screen and (max-width: 600px) {
  table {
    border: 0;
  }

  table caption {
    font-size: 1.3em;
  }
  
  table thead {
    border: none;
    clip: rect(0 0 0 0);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
  }
  
  table tr {
    border-bottom: 3px solid #ddd;
    display: block;
    margin-bottom: .625em;
  }
  
  table td {
    border-bottom: 1px solid #ddd;
    display: block;
    font-size: .8em;
    text-align: right;
  }
  
  table td::before {
    /*
    * aria-label has no advantage, it won't be read inside a table
    content: attr(aria-label);
    */
    content: attr(data-label);
    float: left;
    font-weight: bold;
    text-transform: uppercase;
  }
  
  table td:last-child {
    border-bottom: 0;
  }
 }

 /*]]>*/
 </style>

In this way you can get you data perfectly readable on small screen., as you can see in this example.

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How to set the css :.after size

It may happen that an image you chose for a css after content is too big. Therefore you need to resize it.

The following code doesn’t work:

yourelement::after {
  content: url(image.jpg);
  width: 10px;
}

You should use this, instead

yourelement::after{
    background-image: url(image);
    background-size: 10px 20px;
    display: inline-block;
    width: 10px; 
    height: 20px;
    content:"";
}

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How to switch a php variable according to the server address

I managed to switch my websites links (containing a php variable: $root) according to the server address. If they are in localhost the variable begins with: http://localhost , if they are on remote the variable is the remote address.

The php code is quite simple:

if ($_SERVER['SERVER_NAME'] == "localhost")
{$root_yourwebsiteA = "http://localhost/your path/yourwebsiteA/";
 $root_yourwebsiteB = "http://localhost/your path/yourwebsiteB/";
 $root_yourwebsiteC = "http://localhost/your path/yourwebsiteC/";
}
else 
{$root_yourwebsiteA = "http://remote path/yourwebsiteA/";
 $root_yourwebsiteB = "http://remote path/yourwebsiteB/";
 $root_yourwebsiteC = "http://remote path/yourwebsiteC/";
}

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how to pass a php variable to javascript

You can use a code like the following:

<?php 
  $name= "Hello World";
?> 
<script type="text/javascript"> 
  var x = "<?php echo "$name"?>";      
  document.write(x);    
</script>

and then insert this code in a php page: but not with a js extension, but with some like inc