Alert box, Drop down list, Text box

**gits** · Mar 20 '10, 01:04 PM

please show the code you have so far ... what is the exact problem you have? the existance-check or what?

kind regards

**shravanti88** · Mar 21 '10, 03:44 PM

Hello,
The code i have created is as follows.I need to include a statement to display an alert box showing "the value already exists" , when an existing option is added to dropdown list box from a text box.

Code:

<html>
<script type= "text/javascript" language="javascript">
function addition()
{
var textb= document.getElementById("txtCombo");
var combo= document.getElementById("combo");
var option= document.createElement("option");
option.text= textb.value;
option.value= textb.value;
combo.add(option);
}
</script>
<body>
<form>
location <select name="combo" id="combo" >
<option>ooty
<option>kodai
<option>chennai
</select>
<input type="text" name="txtCombo" id="txtCombo">
<input type="button" value="add" onclick="addition()">
</form>
</body>
</html>

Regards,
Shravs

**gits** · Mar 21 '10, 03:56 PM

so first you would need a check that will perform a loop through your existing option-nodes and test whether an option with the same textnode exists already or not. if so you would just need to display an alert() ...

Alert box, Drop down list, Text box

Alert box, Drop down list, Text box

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