Here's the question (I understand stupid, but ...): how to set the focus on the desired element (for example, select) when you click the button? When I press a button, I just hide half of the form elements (so conceived), but it’s very inconvenient that we stay at the bottom of the page, but we need to be in the middle.

    2 answers 2

    Give your id , for example hashcode and

     <button onclick="sample_click(this)"></button> <script> function sample_click() { var a = document.getElementById('hashcode') a.focus(); } </script>

      First: determine the height of the page - screen.availHeight .
      Second: determine the y coordinate of the element relative to the top of the page. The code can be taken, for example, at the coordinates of the element on the page .
      Third: calculate y so that the element is in the middle of the window.
      Fourth: scroll the page - window.scroll(0, y); .
      Fifth (optional): give focus on the element - _элемент_.focus() ;