how to select the content of a focused text

I have a <input type="text" 开发者_如何学JAVAvalue="Hi! Enter Here" >

How to open this in selected mode and cursor on the input field.

We just start writting into it

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use jquery focus() function

$('input').focus();

Or better

<input type="text" value="Hi! Enter Here" id="someid">

and

$('#someid').focus();

check working example here.

For select and focus

$('#someid').focus().select();

or

$('#someid').focus(function (){$(this).select();});

On jsfiddle.net

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$("input").focus(); 

Read more at http://api.jquery.com/focus/

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Set the id of the input

<input type="text" id="myText" value="Hi! Enter Here" >

Then add this jQuery

$(function() {
  $("#myText").focus();
});