csstwitter-bootstrapresponsive-designfont-sizefont-scaling

Font scaling based on width of container in Bootstrap

How can one scale a block of text (with font-scaling) in Bootstrap Framework?

how to scale a block of text

Width of columns is the main difficulty, because it's fluid.

Solution

  • Bootstrap use CSS @media for Grid system [link] so you can use media queries with Bootstrap's dimensions to set another CSS properties. Check out the fiddle and resize the bar between js and display window to see the effect of header font-size changing.

    <div class="container">
  <h1 class="header">header</h1>
  <div class="row">
    <div class="colDiv col-sm-6 col-md-4 col-lg-3">
      <p>ColumnA</p>
    </div>
    <div class="colDiv col-sm-6 col-md-8 col-lg-9">
      <p>ColumnB</p>
    </div>
  </div>
</div>

    EDIT:

    ok so I wrote a little little JS function to do that. You set six parameters (in order) to manipulate the fontSize:

    alignFont(getElement,defaultSize,defaultWidth,acceleration,min,max)

    And the example (resize the bar between js box and display box): FIDDLE

        var a = document.getElementById('flexibleHeaderA');
    var b = document.getElementById('flexibleHeaderB');
    var c = document.getElementById('flexibleHeaderC');
    var d = document.getElementById('flexibleHeaderD');
    var e = document.getElementById('flexibleHeaderE');

    var settingA = alignFont.bind(this, a, 24, 600, 1, 20, 30);
    var settingB = alignFont.bind(this, b, 24, 600, 1.5, 12, 60);
    var settingC = alignFont.bind(this, c, 30, 600, 1, 15, 35);
    var settingD = alignFont.bind(this, d, 22, 1000, .5, 12, 30);
    var settingE = alignFont.bind(this, e, 16, 80, 1, 12, 26);

    settingA();
    settingB();
    settingC();
    settingD();
    settingE();

    window.addEventListener('resize', function() {
      settingA();
      settingB();
      settingC();
      settingD();
      settingE();
    });


    function alignFont(getElement, defaultSize, defaultWidth, acceleration, min, max) {
      var cWidth = document.body.offsetWidth;
      var newSize = (Math.pow(cWidth / defaultWidth, acceleration)) * defaultSize;
      var limitSize = newSize >= max ? max : newSize <= min ? min : newSize;
      getElement.style.fontSize = limitSize + "px";
    }
    h3 {
  border: dotted 1px #33aaff;
  margin: 10px;
  text-align: center;
}
    <h3 id="flexibleHeaderA">Hello I'm flexible header</h3>
<h3 id="flexibleHeaderB">Hello I'm flexible header</h3>
<h3 id="flexibleHeaderC">Hello I'm flexible header</h3>
<h3 id="flexibleHeaderD">Hello I'm flexible header</h3>
<h3 id="flexibleHeaderE">Hello I'm flexible header</h3>