提问人：Dhivakhar Venkatachalam 提问时间：8/22/2018 更新时间：8/22/2018 访问量：28
在 asp.net 中执行JS函数后，TextBox的颜色值消失了？
Colour value of TextBox vanishes after JS function is executed in asp.net?
问：
当通过以下 JS 函数设置属性时，TexBox 的 color 属性会消失（闪烁）。请指教，如何保留颜色属性？
（即，一旦单击按钮，颜色（绿色表示奇数，红色表示偶数）闪烁，颜色恢复为空白）
function numbercheck() {
var num = document.getElementById("txtnum").value;
if (num == "") {
alert("Please Enter number")
} else {
if (num % 2 == 0) {
alert("You have entered even number");
document.getElementById("txtnum").style.backgroundColor = "green";
} else {
alert("You have enetered Odd number");
document.getElementById("txtnum").style.backgroundColor = "red";
}
}
}<p> Please enter a Number :
<asp:TextBox ID="txtnum" runat="server"></asp:TextBox>
</p>
<asp:Button Text="Check Number" ID="btnnum" runat="server" OnClientClick="return numbercheck()" />答：
0赞
usha
8/22/2018
#1
Please change your script function as
function numbercheck() {
debugger;
var num = document.getElementById("<%=txtnum.ClientID%>").value;
if (num == "") {
alert("Please Enter number")
} else {
if (num % 2 == 0) {
alert("You have entered even number");
document.getElementById("<%=txtnum.ClientID%>").style.backgroundColor = "green";
} else {`enter code here`
alert("You have enetered Odd number");
document.getElementById("<%=txtnum.ClientID%>").style.backgroundColor = "red";
}
}
}
and
<asp:Button Text="Check Number" ID="btnnum" runat="server" OnClientClick="return numbercheck()" CausesValidation="false" UseSubmitBehavior="false" />
评论
OnClientClick="numbercheck(); return false;"将阻止按钮回发。因此，您将保留文本框颜色属性。return false