JavaScript for comparing combo date with date picker date

Question

I want to select the date in combo box which is less-than or equal to date selected in date picker. I am using this code. Note combo box contains the dates from database in an array.

But its not working as per my requirement.

function copytxt(){
        var w = document.getElementById("dateoil").value;
        document.getElementById("cb1").value <= w;}

Answer 1

If "dateoil" represents date picker and "cb1" represents combo box. Then from what I have understood, this might be helpful:

function copyText() {
        var dp = document.getElementById("dateoil").value;
        var cb = document.getElementById("cb1").value;
        if(cb <= dp) {
           cb = dp;
        }
   }

Assuming the combo box receives the data from database and its an array of positive decimal values. Then this could be one of the ways to achieve the desired output.

function setValue() {
        var dp = document.getElementById("dateoil");
        var cb = document.getElementById("cb1").value;
        var comboValues = [];
        for (var i = 0; i < dp.length; i++){ 
            if(dp[i].value <= cb){
              comboValues.push(parseFloat(dp[i].value));
            }
        }
        dp.value = comboValues.sort().pop();
   }