JQuery - 如何监听 ID 更改按钮并在加载后重置其属性

Question

I have a submit button for a textarea in a modal, and this button set to disabled if the textarea is empty. The code is:

function textAreaListener() {
  if (!($(#text-area).val().trim())) {
    $('#submit-button').prop({ disabled: true });
  } else {
    $('#submit-button').prop({ disabled: false });
  }
}

It works well.

After that, I wrote another method to call the modal, and I need to change the button's id so that the original click event will not happen, I used $('#submit-button').attr('id','batch-submit-button'); to change button's id, and changed the function above to:

function textAreaListener() {
  if (!($(#text-area).val().trim())) {
    $('#submit-button').prop({ disabled: true });
    $('#batch-submit-button').prop({ disabled: true });
  } else {
    $('#submit-button').prop({ disabled: false });
    $('#batch-submit-button').prop({ disabled: false });
  }
}

And then the prop({ disabled: false }) is not working for the button with new id ( #batch-submit-button ), but the older button with old id works well. I looked couple question in StackOverflow and I think the reason is JQuery can't capture the new id after loaded. Is there any way to solve it? Thank you!

------------------Here's my haml file------------------------------

#state-modal.modal
  .modal-dialog
    .modal-content
      .modal-header
        %h5#state-modal-title.modal-title
      .modal-body
        = form_for :proposal, url: '#', html: {id: 'state-modal-form'} do |form|
          = form.text_area :comment, id: 'text-area', |
          placeholder: t('.comment'), class: 'form-control', rows: 5
      .modal-footer
        %button.btn.btn-default{id: 'cancel-button', data: {dismiss: 'modal'}}= t('.cancel')
        %button.btn.btn-primary{id: 'submit-button'}= t('.done')

The exact case is:

$(function () {
  function initState() {
    $('#state-modal-form').attr('action', '#');
    $('#state-modal-form textarea').val('').hide();
    $('#submit-button').prop({ disabled: true });
  }

  function assignHandlersToElements() {
    $(document).on('click', '.commentable-element', App.books.bookCommentableElementHandler);
    $(document).on('keyup', '#state-modal-form textarea', App.books.textAreaListener);
    $(document).on('click', '#cancel-button', App.books.initState);
    $(document).on('click', '#submit-button', App.books.submitHandler);
  }

  function bookCommentableElementHandler(event) {
    event.preventDefault();
    if(event.target.id == 'selected-button'){
      $('#submit-button').attr('id','batch-submit-button');
      $('#text-area').show();
      $('#batch-submit-button').prop({ disabled: true });
    }else{
      $('#state-modal-form').attr('action', $(this).data('url'));

      $('#text-area').attr('placeholder', 'Comment').show();
      $('#text-area').show()
    }
    $('#state-modal').modal({ backdrop: 'static', keyboard: false }, 'show');
  }

  function textAreaListener() {
    if (!($(this).val().trim())) {
      $('#submit-button').prop({ disabled: true });
      $('#batch-submit-button').prop({ disabled: true });
    } else {
      $('#submit-button').prop({ disabled: false });
      $('#batch-submit-button').prop({ disabled: false });
    }
  }

  function submitHandler() {
    $('#state-modal-form').submit();
  }

  App.books.initState = initState;
  App.books.assignHandlersToElements = assignHandlersToElements;
  App.books.bookCommentableElementHandler = bookCommentableElementHandler;
  App.books.textAreaListener = textAreaListener;
  App.books.submitHandler = submitHandler;
  App.books.assignHandlersToElements();
  App.books.initState();
});

Answer 1

I have simulated your code on my side. And prop({disabled: false }); is working for id changed button. Here is my code.

HTML:

<button id="submit-button">Submit</button>
<button id="disable_btn">Disable</button>
<button id="enable_btn">Enable</button>
<button id="change_id">Change ID</button>

jQuery:

$(document).ready(function(){
    $("#disable_btn").click(function(){
        $('#submit-button').prop({ disabled: true });
        $('#batch-submit-button').prop({ disabled: true });
    });

    $("#enable_btn").click(function(){
        $('#submit-button').prop({ disabled: false });
        $('#batch-submit-button').prop({ disabled: false });
    });

    $("#change_id").click(function(){
        $('#submit-button').attr('id', 'batch-submit-button');
    });
});

Please provide your exact case.