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javascript form alert

kempvet
kempvet asked
on
2,283 Views
Last Modified: 2008-06-15
<form>
<ntb:Combo id="myCombo" Mode="classic" >
<ntb:ComboTextBox
                     Width="300px" value="Keyword Search - Then Press Down Arrow"
                     DataFieldIndex=1>
</ntb:ComboTextBox>
....................etc etc
</ntb:Combo>
<input  type="submit"   value="Add Item" >
<form>

the documentation states that the Combo Object can be accessed by the following

myComboObject= document.getElementById("myCombo").object;

what I need is a javascript function that will give an alert
"Please Select An Item"
if the form is submitted and the value "Keyword Search - Then Press Down Arrow" is in the ComboTextBox field

in other words to stop some confusion when a new user simply clicks on the submit button before realising that they have not selected a search item first
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in your <head></head>

<script>
  function checkSubmit(){
      var myComboObject= document.getElementById("myCombo").object;
       if(myComboObject.GetTextValue() == "Keyword Search - Then Press Down Arrow"){
               alert("Please Select An Item");
               return false;
       }
        return true;
   }
</script>

then at your form:

<form ...  onsubmit="checkSubmit();">
<ntb:Combo id="myCombo" Mode="classic" >
<ntb:ComboTextBox
                     Width="300px" value="Keyword Search - Then Press Down Arrow"
                     DataFieldIndex=1>
</ntb:ComboTextBox>
....................etc etc
</ntb:Combo>
<input  type="submit"   value="Add Item" >
</form>
Michel PlungjanIT Expert
CERTIFIED EXPERT
Top Expert 2009

Commented:
Yeah, I guess it is jsObject.  I was going by your earlier comment using ".object".  not sure what the difference is.

Author

Commented:
the script works to produce the alert but then appears to want to submit the form still, the work around uses the   document.location =  history.go(0);
is there another way to get the script to just close the alert box, the return false does not appear to work in this case

<script>
  function checkSubmit(){
      var myComboObject= document.getElementById("myCombo").object;
       if(myComboObject.GetTextValue() == "Keyword Search - Then Press Down Arrow"){
               alert("Please Select An Item");
              document.location =  history.go(0);
               return false;
       }
        return true;
   }
</script>

try changing the onsubmit to the following:

onsubmit="return checkSubmit()"
Michel PlungjanIT Expert
CERTIFIED EXPERT
Top Expert 2009

Commented:
This is not valid JS
    document.location =  history.go(0);
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