How to Detect 'Shift Enter' and Create New Lines in a Textarea Using jQuery or JavaScript?

Detecting "Shift Enter" and Generating New Lines in Textarea with jQuery

In web forms, pressing "Enter" in a textarea typically submits the form. However, you may want to implement a different behavior, such as creating a new line when "Shift Enter" is pressed.

jQuery Solution

$("#textarea_id").on("keydown", function(evt) {
  if (evt.keyCode == 13 && evt.shiftKey) {
    // Insert a newline character
    if (evt.type == "keypress") {
      pasteIntoInput(this, "\n");
    }
    // Prevent form submission
    evt.preventDefault();
  }
});

function pasteIntoInput(el, text) {
  el.focus();
  if (typeof el.selectionStart == "number" && typeof el.selectionEnd == "number") {
    var val = el.value;
    var selStart = el.selectionStart;
    el.value = val.slice(0, selStart) + text + val.slice(el.selectionEnd);
    el.selectionEnd = el.selectionStart = selStart + text.length;
  } else if (typeof document.selection != "undefined") {
    var textRange = document.selection.createRange();
    textRange.text = text;
    textRange.collapse(false);
    textRange.select();
  }
}

Plain JavaScript Solution

var textarea = document.querySelector("#textarea_id");

textarea.addEventListener("keydown", function(evt) {
  if (evt.keyCode == 13 && evt.shiftKey) {
    if (evt.type == "keypress") {
      pasteIntoInput(this, "\n");
    }
    evt.preventDefault();
  }
});

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