Question

Set Cursor Position In TextBox onselect

Asked by: Kachele

I have a web form with several input text boxes.  In some of the boxes I am looking for a dollar amount so I initialize the box with a '$' sign, adn another I want a percentage so i init the box with a '%' sign and another I want a web site so I init the box with "http://" .  What I want to do is when the text box is selected I want the cursor to go to a specific location (either at the beginning for the percentage or at the end for the rest so the user does not erase the '$' or '%' or "http://" when entering in data.

Thanks,
JK

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Asked On
2005-10-25 at 12:28:42ID21607302
Tags

cursor

,

position

,

textbox

Topic

JavaScript

Participating Experts
2
Points
175
Comments
5

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Answers

 

by: pravinasarPosted on 2005-10-25 at 13:25:35ID: 15157657

<script language="javascript">
function IsDollar(evt, textObj) {
   if (textObj.value.length < 0) { textObj.value = '$';  return; }
   if (textObj.value.match(/^\$/) == null) { textObj.value = '$' + textObj.value; }
}
function IsPercent(evt, textObj) {
   if (textObj.value.length < 0) { textObj.value = '%';  return; }
   if (textObj.value.match(/^\%/) == null) { textObj.value = '%' + textObj.value; }
}
function IsHttp(evt, textObj) {
   var str = "http://";
   if (textObj.value.length < str.length) { textObj.value = str;  return; }
   var value = textObj.value.toLowerCase();  
   if (value.indexOf (str) <  0) { textObj.value = str + textObj.value; }
}
</script>
<input type="text" name="txt1" value="1213.0"  onKeyUp="IsDollar(window.event, this);">
<input type="text" name="txt1" value="%11"  onKeyUp="IsPercent(window.event, this);">
<input type="text" name="txt1" value="http://www.yahoo.com"  onKeyUp="IsHttp(window.event, this);">

 

by: dbrittPosted on 2005-10-25 at 13:47:29ID: 15157832

prav, I'm curious...why did you pass window.event as a parameter?

 

by: dbrittPosted on 2005-10-25 at 13:48:48ID: 15157845

<no points>

You'll probably want to call those functions for each text box's onblur event, too.

 

by: KachelePosted on 2005-10-25 at 19:27:29ID: 15159510

This is a nice script but what I was really looking for was a method to set the cursor position in the rext box when it's selected.  Basically somehting likie this (but works):

function IsDollar(evt, textObj) {
   textObj.CursorPosition = 2;
}

<input type="text" name="txt1" value="http://www.yahoo.com"  onSelect="IsDollor(window.event, this);"

 

by: dbrittPosted on 2005-10-25 at 19:40:45ID: 15159551

You mean like this:

===================================

<html>
<head>
      <title>Test Page</title>

      <script language="JavaScript" type="text/javascript">
      
      // From
      //       http://www.faqts.com/knowledge_base/view.phtml/aid/13562
      
      function setSelectionRange(input, selectionStart, selectionEnd)
      {
            if (input.setSelectionRange)
            {
                  input.focus();
                  input.setSelectionRange(selectionStart, selectionEnd);
            }
            else if (input.createTextRange)
            {
                  var range = input.createTextRange();
                  range.collapse(true);
                  range.moveEnd('character', selectionEnd);
                  range.moveStart('character', selectionStart);
                  range.select();
            }
      }
      
      </script>
</head>

<body>
      <form action="page.html" method="GET">
            <input type="text" id="txt1" name="txt1" value="http://www.yahoo.com" onclick="javascript:setSelectionRange(this, 7, 7);">
      </form>
</body>
</html>

20120131-EE-VQP-002

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