Limit the number of textarea input words

Today, the first requirement to receive a task is to limit the number of words, to see the previous code left by the predecessor, using textarea, so take it for granted maxlength, the results found useless. Check that the original textarea for maxlength support to Ie10, the customer just ask the development environment is IE8 ... Had to look for ways again.

The main problem here is not only to limit the keyboard input, but also to limit the copy and paste. The best way to do this is to eject the box when the user exceeds the limit, and force the input characters in the range to be taken. This can be better to achieve the front-end user requirements, for future database processing is more convenient.

Originally thought is to use key correlation method to detect, concrete method writing is very simple:

 1  <script>2  function   Limittextarea (field) { 3  maxlimit = 4000;  4  if  (field.value.length > Maxlimit) { 5  field.value = field.value.substring (0, maxlimit);  6  alert ("No more than 4000 words!") " 7   8
         9  </script> 

1 <textarea id= "Mqone" name= "Mqone" cols= "Ten" rows= "5" style= "width:200px" onkeydown= "Limittextarea (This) "Onkeyup=" Limittextarea (This) "onkeypress=" Limittextarea (This) "></textarea>

But it turns out that this method is not detectable for mouse operation, but it is possible for Ctrl + V. Finally, the Onpropertychange method is used:

style= "width:200px" onpropertychange= "Limittextarea (This)" ></textarea>

But this is also the IE proprietary method, FF and the like can use Oninput method, using the same method:

style= "width:200px" oninput= "Limittextarea (This)" ></textarea>

If you use browser detection can be separated, if there is no two attributes can be written together at the same time, no problem found.

Limit the number of textarea input words