How to select a value in dropdown javascript?

Answer 1

Instead of doing

function setSelectedIndex(s, v) {
    for ( var i = 0; i < s.options.length; i++ ) {
        if ( s.options[i].value == v ) {
            s.options[i].selected = true;
            return;
        }
    }
}

I solved this problem by doing this

function setSelectedValue(dropDownList, valueToSet) {
    var option = dropDownList.firstChild;
    for (var i = 0; i < dropDownList.length; i++) {
        if (option.text.trim().toLowerCase() == valueToSet.trim().toLowerCase()) {
            option.selected = true;
            return;
        }
        option = option.nextElementSibling;
    }
}

If you work with strings, you should use the .trim() method, sometimes blank spaces can cause trouble and they are hard to detect in javascript debugging sessions.

dropDownList.firstChild will actually be your first option tag. Then, by doing option.nextElementSibling you can go to the next option tag, so the next choice in your dropdownlist element. If you want to get the number of option tags you can use dropDownList.length which I used in the for loop.

Hope this helps someone.