Form Control JavaScript DHTML

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  4. Form value validation and onsubmit action


Form Validation

function checkValid() {
    var cityField = document.forms[0]["city"];
    if (cityField.value != "Van") {
        var cityDiv = document.getElementById("citydiv");
        cityDiv.style.fontWeight = "bold";
        return false;
    } else {
        return true;
    }
}




City: 




    function init() {
        document.forms[0].onsubmit = function() { return checkValid(this) };
    }
    window.onload = init;