asp.net - 将服务器端 vb.net 转换为客户端 javascript

Question

我有一个我很久以前写的函数，它运行良好，但我想通过在 Javascript 中做同样的工作来加快这个过程并减轻服务器负载。

我似乎能够获取文本框值，但我似乎无法设置文本框值(我是一个 JS 菜鸟)。任何人都可以帮忙将我的 VB.NET 代码转换为等效的 JS 代码吗？

Protected Sub txtSellingPrice_TextChanged(ByVal sender As Object, ByVal e As EventArgs) _
    Handles txtSellingPrice.TextChanged

    Dim SellingPrice As Double = Double.Parse(txtSellingPrice.Text.Replace("$", ""))
    Dim BallanceSheet As Double = If(txtBalanceSheet.Text = "", 0, Double.Parse(txtBalanceSheet.Text.Replace("$", "")))
    Dim DownPayment As Double = If(txtDownPayment.Text = "", 0, Double.Parse(txtDownPayment.Text.Replace("$", "")))

    txtGoodWill.Text = SellingPrice - BallanceSheet
    txtBalance.Text = SellingPrice - DownPayment
    txtSellingPriceMult.Text = SellingPrice

End Sub

到目前为止，我已经了解了这一点，但我不确定如何取得更多进展。

function txtSellingPrice_OnChange() {
    var txtSellingPrice = document.getElementById('<%=txtSellingPrice.ClientID %>')
    var txtBalanceSheet = document.getElementById('<%=txtBalanceSheet.ClientID %>')
    var txtDownPayment = document.getElementById('<%=txtDownPayment.ClientID %>')


}

Answer 1

function txtSellingPrice_OnChange() {
    //Get your elements
    var txtSellingPrice = document.getElementById('<%=txtSellingPrice.ClientID %>');
    var txtBalanceSheet = document.getElementById('<%=txtBalanceSheet.ClientID %>');
    var txtDownPayment = document.getElementById('<%=txtDownPayment.ClientID %>');

    var txtGoodWill = document.getElementById('<%=txtGoodWill.ClientID %>');
    var txtBalance = document.getElementById('<%=txtBalance.ClientID %>');
    var txtBalance = document.getElementById('<%=txtBalance.ClientID %>');

    //Your if empty value checks
    var sellingPrice = txtSellingPrice.value.replace('$', '');
    sellingPrice = (sellingPrice == '' ? 0 : sellingPrice);
    var ballanceSheet = txtBalanceSheet.value.replace('$','');
    ballanceSheet = (ballanceSheet == '' ? 0 : ballanceSheet);
    var downPayment = txtDownPayment.value.replace('$','');
    downPayment = (downPayment == '' ? 0 : downPayment);

    txtGoodWill.value = (sellingPrice - ballanceSheet);
    txtBalance.value = (sellingPrice - downPayment);
    txtSellingPriceMult.value = sellingPrice;

}