Replace text in textarea using Javascript -


i need replace matches of regular expression till caret position in textarea using javascript. example, if text in textarea is: "6 students carry 2 books 5 classes" , cursor placed on books , regular expression /\d/, numbers 6 , 2 should replaced by, say, 4. know replace function , know how caret position, how solve problem? in advance! 

textareaclicked = function(e){ var pos = e.target.selectionstart; var beforeselection = e.target.innerhtml.slice(0,pos); var afterselection = e.target.innerhtml.slice(pos); var newhtml = beforeselection.replace(/\d/g,4) + afterselection; e.target.innerhtml = newhtml; e.target.setselectionrange(pos,pos); }; document.getelementbyid('foo').onclick=textareaclicked;

see in action in this jsfiddle.


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