通过javascript从readonly textarea获取更改值

Question

我有一个readonly textarea，其值不断变化。现在我希望页面不断更新其值并返回结果，如果它与提供的字符串匹配。这是我尝试过的，但它不起作用

var string = "This is my house";

    $('#textarea').bind('input', function() { 

    if ($(this).val() === string.trim()) {
        $('#message').html('matching').css('color', 'green');       
    } else $('#message').html('not matching').css('color', 'red');
});

Answer 1

我认为您无法收听input事件，因为textarea是readonly，您可以做的是触发input - 或任何其他事件< / em> - 在更改textarea的文本内容的相同代码中使用.trigger()

JS Fiddle

var string = "This is my house", ta = $('#textarea'), msg = $('#message'),
    newContent = 'just dummy text'; // replacement text, change it to see the result

ta.on('input', function() {
  if ($(this).val() === string.trim()) { msg.html('matching').css('color', 'green'); } 
  else { msg.html('not matching').css('color', 'red'); }
});

$('#btn').on('click', function() {
  ta.text(newContent).trigger('input'); // trigger input event as text content is changed
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<button id="btn">Change it</button><br>
<textarea readonly name="" id="textarea" cols="30" rows="5">This is my house</textarea>
<hr><div id="message"></div>

Answer 2

你可以做这样的事情

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var string = 'This is my house';
var array = ['Lorem ipsum dolor sit amet', 'consectetur adipisicing elit', 'This is my house', 'quae aperiam solut'];
var counter = 0;

$('textarea').click(function() {
   if(array[counter] == string.trim()) {
   	 $('.result').text('Matching').css('color', 'green');
   } else {
   	 $('.result').text('Not matching').css('color', 'red');
   }
   
   $('textarea').text(array[counter]);
   counter = (counter + 1) % array.length;
});

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<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<textarea readonly placeholder="Click Me" class="textArea"></textarea>
<div class="result"></div>

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