how to write javascript alert on form submit

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Hello Experts,

Here is my Aspx page

XML

<form id="FindItems" method="post" action="">
      <input type="hidden" id="FormAction" name="FormAction" value="" />
      <input type="hidden" name="SearchValue" value="<asp:Literal ID='litSearchValue' runat="'server'" />" </form>
       Department:
      <select name="Dept">
<asp:Literal ID="litDeptOptions" runat="server" />
      </select>
     Product Code:

       <input type="text" name="txtVpPrdCd" maxlength="15" style="text-transform:uppercase;"/>

      <input type="submit" value="Search" onclick="myFunction()" />

Now I want a JavaScript to run when user clicks on submit . saying that user is allowed to enter only either Department or Product Code but not both? How can I do that...
Please help me in this

Posted 25-Jun-15 7:52am

sudevsu

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Arkadeep De · Answer 1 · 2015-06-25T08:35:00

Check this solution.... I took a button click function and add an id to the Drop Down List.

JavaScript

$( "#btnSelect" ).click(function() {
    var ddl = $("#id1 option:selected").val();
    //alert(ddl);

    var text = $("#txt1").val();
    //alert(text);
    var final;

    if(ddl=='0' && text=='')
    {
        alert('Select any one !');
        return;
    }
    else if(ddl!='0' && text!='')
    {
        alert('You have to select only one !');
        return;
    }
    else
    {
        if(ddl!='0') { final = ddl;}
        else if (text !='') {final = text}
    }
    alert('Final Value is ' + final);
});

For on line trial go to JSFiddle [^]