javascript - getElementsByTagName for two tags at once - Stack Overflow

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I use this:

function setFontSize() {
   var p = document.getElementsByTagName('td');
   for(i=0;i<p.length;i++) {
      p[i].style.fontSize = selectedsize+"px"
   }
}

What's the simplest and best way to throw in 'th' too?

I use this:

function setFontSize() {
   var p = document.getElementsByTagName('td');
   for(i=0;i<p.length;i++) {
      p[i].style.fontSize = selectedsize+"px"
   }
}

What's the simplest and best way to throw in 'th' too?

• javascript

Share Improve this question Follow asked May 26, 2013 at 12:42 Ole SørensenOle Sørensen 35955 silver badges1919 bronze badges 6

• 6 querySelectorAll – elclanrs Commented May 26, 2013 at 12:45
• Why not add a class on the <table> element, and then #table.big-fonts td { font-size: 125% } stuff. Querying all the cells manually and writing their style is not a good approach. – Šime Vidas Commented May 26, 2013 at 13:33
• @elclanrs Think outside of the box. Why walk the DOM to find all cells when you can just set a class name on the table? – Šime Vidas Commented May 26, 2013 at 13:34
• I didn't know about querySelectorAll. Reading up on that now. Thanks. – Ole Sørensen Commented May 26, 2013 at 19:32
• With my limited insight I would just love to not batch through my whole site to add a class to the tables that I consider default styled tables. – Ole Sørensen Commented May 26, 2013 at 19:35

 |  Show 1 more ment

2 Answers 2

Sorted by: Reset to default 10

If you don't have to support older browsers you can use document.querySelectorAll(..).

function setFontSize() {
   var i;
   var p = document.querySelectorAll('td, tr');
   for( i = 0; i < p.length; i++ ) {
      p[i].style.fontSize = selectedsize + "px"
   }
}

function setFontSize() {
   var p = document.getElementsByTagName('td'),
       ths = document.getElementsByTagName('th'),
       val = selectedsize + "px";
   for(var i = 0; i < p.length; i++) {
      p[i].style.fontSize = val;
      ths[i].style.fontSize = val;
   }
}

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