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October 30, 2015 14:45
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Go to a specified line & character within a text box
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Go To Line/Character</title> | |
| </head> | |
| <body> | |
| <form action="javascript:go();"> | |
| <textarea id="txt" rows="25" cols="150"></textarea><br> | |
| <br> | |
| <label>Line <input type="number" id="line" step="1" min="1" value="1"></label><br> | |
| <label>Char <input type="number" id="char" step="1" min="1" value="1"></label><br> | |
| <input type="submit" id="go" value="Go"> | |
| </form> | |
| <script type="text/javascript"> | |
| function go(){ | |
| var txt = document.getElementById("txt"), | |
| line = document.getElementById("line").value, | |
| char = document.getElementById("char").value, | |
| rxp, before, loc; | |
| rxp = new RegExp("^(.*\n){"+(line-1)+"}"); | |
| before = rxp.exec(txt.value); | |
| if(!before){ //the text has fewer than `line` lines | |
| //put the cursor at the end of the text | |
| before = txt.value; | |
| char = 0; | |
| } | |
| else{ | |
| before = before[0]; | |
| char--; | |
| } | |
| loc = before.length + 1*char; | |
| txt.setSelectionRange(loc, loc+1); | |
| txt.focus(); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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