pass parameter to Javascript RSS

• • Reply
  

  jkj1998

  Member

  15 Points

  3 Posts

  pass parameter to Javascript

  Jul 31, 2003 03:40 PM|LINK

  Hi I am trying to pass parameter to the Javascript function from code behind as follows: in Page_Load i have btnAddSymChange.Attributes.Add("onClick", "return ValidateText(" + txtChValue.Text + ")") in aspx page i have <script language="javascript"> function ValidateText(ChValue) { //If(i=="") //{ alert(ChValue); return false; //} } </script> I get an alert as undefined.. what is the problem here? Thanx jkj
• • Reply
  

  Atrax

  All-Star

  18705 Points

  3733 Posts

  Re: pass parameter to Javascript

  Jul 31, 2003 04:13 PM|LINK

  try this : btnAddSymChange.Attributes.Add("onClick", "return ValidateText('" + txtChValue.Text + "')") (single quotes added) j
  RTFM - straight talk for web developers. Unmoderated, uncensored, occasionally unreadable
  
  Jason Brown - MVP, IIS
• • Reply
  

  rox.scott

  Contributor

  6080 Points

  1214 Posts

  Re: pass parameter to Javascript

  Jul 31, 2003 04:24 PM|LINK

  btnAddSymChange.Attributes.Add("onClick", "return ValidateText('" + txtChValue.Text + "')")

  OR

  btnAddSymChange.Attributes.Add("onClick", "return ValidateText(txtChValue.Text)") 

• • Reply
  

  rox.scott

  Contributor

  6080 Points

  1214 Posts

  Re: pass parameter to Javascript

  Jul 31, 2003 04:27 PM|LINK

  sorry, the second line of my last post should be this:

  btnAddSymChange.Attributes.Add("onClick", "return ValidateText(document.all.txtChValue.value)")

• • Reply
  

  jkj1998

  Member

  15 Points

  3 Posts

  Re: pass parameter to Javascript

  Jul 31, 2003 05:24 PM|LINK

  Thanx for the reply... It works now but i have another prb here I have the code as follwos: <script language="javascript"> // whitespace characters var whitespace = " \t\n\r"; /****************************************************************/ // Check whether string s is empty. function isEmpty(s) { return ((s == null) || (s.length == 0)) } /****************************************************************/ function isWhitespace (s) { var i; // Is s empty? if (isEmpty(s)) return true; // Search through string's characters one by one // until we find a non-whitespace character. // When we do, return false; if we don't, return true. for (i = 0; i < s.length; i++) { // Check that current character isn't whitespace. var c = s.charAt(i); if (whitespace.indexOf(c) == -1) return false; } // All characters are whitespace. return true; } /****************************************************************/ function ValidateSymChange(symChangeValue) { var strInput = new String(symChangeValue); If(isWhitespace(strInput)) { alert("test"); return false; } } </script> n the code is as follows in the code behind file: btnAddSymChange.Attributes.Add("onClick", "return ValidateSymChange(document.all.txtSymbolChange.value)") But JS function returns a true ...and the error it shows is Object recquired what is thr prb here? thanx jkj.
• • Reply
  

  jkj1998

  Member

  15 Points

  3 Posts

  Re: pass parameter to Javascript

  Jul 31, 2003 06:09 PM|LINK

  Hi Thanx for the reply... But I get a different problem now... I have the following code in the aspx page: <script language="javascript"> // whitespace characters var whitespace = " \t\n\r"; /****************************************************************/ // Check whether string s is empty. function isEmpty(s) { return ((s == null) || (s.length == 0)) } /****************************************************************/ function isWhitespace (s) { var i; // Is s empty? if (isEmpty(s)) return true; // Search through string's characters one by one // until we find a non-whitespace character. // When we do, return false; if we don't, return true. for (i = 0; i < s.length; i++) { // Check that current character isn't whitespace. var c = s.charAt(i); if (whitespace.indexOf(c) == -1) return false; } // All characters are whitespace. return true; } /****************************************************************/ function ValidateSymChange(symChangeValue) { var strInput = new String(symChangeValue); If(isWhitespace(strInput)) { alert("test"); return false; } } </script> and I call the function from the code behind as follows: btnAddSymChange.Attributes.Add("onClick", "return ValidateSymChange(document.all.txtSymbolChange.value)") But i get a return value as true...when the textbox is empty the JS error reads: Object Expected at this line: var strInput = new String(symChangeValue); what could be the cause for the error.. Thanx Jkj
• • Reply
  

  rox.scott

  Contributor

  6080 Points

  1214 Posts

  Re: pass parameter to Javascript

  Aug 01, 2003 06:10 AM|LINK

  the error is actually on this line:

  If(isWhitespace(strInput))

  ... "if" needs to be lowercase. The next problem will be that ValidateSymChange() can't return true, should be like so:

  function ValidateSymChange(symChangeValue) 
  { 
    if(isWhitespace(symChangeValue)) 
      return false; 
    return true;
  }