如何在JavaScript上访问HTML输入元素

Question

I'm trying to retrieve the customers name by alert based on the account number that's entered into the textbox by i'm having trouble referencing the textbox (>>txtFree<<). I just not sure what i must replace it with if anyone could help please.

HTML

Account Number: <input type="text" id="txtFreeBank" name="txtFreeBank" />

JS

function checkBankAc() {
        var txtFree = parseFloat(document.getElementById('txtFreeBank').value);

        var bankdetails = Parse.Object.extend("BankDetails");
        var query = new Parse.Query(bankdetails);
        query.equalTo("AccountNum", >>txtFree<<);
        query.find({
            success: function (results) {
                alert("Successfully retrieved " + results.length + " scores.");

                for (var i = 0; i < results.length; i++) {
                    var object = results[i];
                    alert(object.id + ' - ' + object.get('CustomerName'));
                }
            },
            error: function (error) {
                alert("Error: " + error.code + " " + error.message);
            }
        });
    }

Answer 1

您可以访问>>txtFree<<来访问以下输入的数据：

document.getElementById('txtFreeBank').value