/
gatesslider.js
52 lines (43 loc) · 1.27 KB
/
gatesslider.js
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function selectGate()
{
var currentgate = document.getElementById("gateslider").value;
selectTextareaLine(
document.getElementById("circuitnew"),
Number(currentgate) + 3);
}
/*
Solution from https://stackoverflow.com/questions/13650534/how-to-select-line-of-text-in-textarea
*/
function selectTextareaLine(tarea,lineNum) {
lineNum--; // array starts at 0
var lines = tarea.value.split("\n");
// calculate start/end
var startPos = 0, endPos = tarea.value.length;
for(var x = 0; x < lines.length; x++) {
if(x == lineNum) {
break;
}
startPos += (lines[x].length+1);
}
var endPos = lines[lineNum].length+startPos;
// do selection
// Chrome / Firefox
if(typeof(tarea.selectionStart) != "undefined") {
tarea.focus();
tarea.selectionStart = startPos;
tarea.selectionEnd = endPos;
return true;
}
// IE
if (document.selection && document.selection.createRange) {
tarea.focus();
tarea.select();
var range = document.selection.createRange();
range.collapse(true);
range.moveEnd("character", endPos);
range.moveStart("character", startPos);
range.select();
return true;
}
return false;
}