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dataTable search box only manually input to filter

My problem is that I want to set the default value of the search box and to filter according to the conditions which I setted when I Initialize the page. $("#table_id_filter input").val("man"); //set the default value of the search box

  $("#table_id_filter input").val("man"); //set the default value of the search box 

But it does't work,I must click the search box and do someting(for example add a space),then it can filter.

I use the .focus() function to make the input be focused when the page load, and it works,but the fifter don't excute, I must to excute one keyEvent then it can filter.I want to know if I can invoke the filter function again when the input has be focused.

If I want to finish this function,how? Can you helo me? Thank you!

As "Guruprasad Rao" Suggested in the comments trigger focus on page load, see code below:

<!DOCTYPE html>
<html>
<body>

<form>
   First name: <input type="text" name="fname" autofocus><br>
   Last name: <input type="text" name="lname"><br>
<input type="submit">
</form>

<p><strong>Note:</strong> The autofocus attribute of the input tag is not supported in Internet Explorer 9 and earlier versions.</p>

 </body>
 </html>

Heres a working example:

http://plnkr.co/edit/Pihw47MFzIVbBP9NH0VL?p=preview

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