仅当选择特殊值时，才根据下拉列表的更改提交表单

Question

I have a dropdown list with a few options (eg 7). The form should be submitted when one of the last 3 options is selected. On the first 4 options the form should not be submitted.

onChange="this.form.submit()" does not help - the form will be submitted on every change...

Any ideas?

Thanks a lot in advance

Hias

Answer 1

Do...

onchange="checkVal();"

Then in your JS make the function...

function checkVal{
    var e = document.getElementById("FORMID");
    var selectedVal = e.options[e.selectedIndex].value;
    if (selectedVal == val4 || selectedVal == val5 || selectedVal == val6){
         e.submit();
    }
}

This will work if you have your options set up with values <option val="4">number 4</option> If not you have to use .text instead of .value to get the selectedVal and then compare the text inside the options

Answer 2

It's simple check the value of select element if it's what you want then tell form to submit itself.

Demo of this : http://jsfiddle.net/Q6FUM/

var f = document.forms['mf'], s= document.getElementById('ss');

s.onchange = function() {
    if (s.value==3) f.submit();
}

Answer 3

Thanks a lot. It works with this code:

function checkVal() {
  var f = document.getElementById("FORM-ID");
  var e = document.getElementById("SELECT-ID");
  var selectedVal = e.options[e.selectedIndex].value;
  if (selectedVal > 4) {
    f.submit();
  }
}