Double-click code block selection

Adding double-click code block selection¹⁾ to DokuWiki requires some modification to the core engine.

1. Define a function that takes an element as an argument, then selects all of that element's text. You need to do this somewhere in a script file loaded by default (e.g. /lib/scripts/script.js):

   /**
    * Function to select code blocks on double-click
    */
   function firefive_selectCode(codeBlock) {
    
     var range;
    
     if (document.body.createTextRange) {
    
       range = document.body.createTextRange();
       range.moveToElementText(codeBlock);
       range.select();
    
     } else if (window.getSelection) {
    
       range = document.createRange();
       range.selectNodeContents(codeBlock);
    
       var selection = window.getSelection();
       selection.removeAllRanges();
       selection.addRange(range);
     }
   }

2. Call the function when a code block is double-clicked, by adding an ondblclick attribute to the <pre> tag that opens a code block. These tags are prepared in the _highlight() function, found in /inc/parser/xhtml.php.

   Extend the start of the <pre… tag to include

   <pre title="TIP: Double-click anywhere in the block to select all the text." ondblclick="firefive_selectCode(this);"'... 

The line of code appears in different places for different wiki versions: