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通过javascript更改ASP:TEXTBOX的背景色_Javascript_Asp.net - Fatal编程技术网
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通过javascript更改ASP:TEXTBOX的背景色

javascript asp.net

通过javascript更改ASP:TEXTBOX的背景色,javascript,asp.net,Javascript,Asp.net,我已经在我的aspx页面中声明了asp:textbox <asp:TextBox ID="txta" runat="server" size="12" value="123"></asp:TextBox> 当控件失去焦点时，将显示警报，但背景颜色不变 如何做到这一点 使用document.getElementById（“”）.style.backgroundColor=“#FF0000” 您忘记了使用文档.getElementById（“”）.style.backgr

我已经在我的aspx页面中声明了asp:textbox

 <asp:TextBox ID="txta" runat="server" size="12" value="123"></asp:TextBox>
当控件失去焦点时，将显示警报，但背景颜色不变

如何做到这一点

使用
document.getElementById（“”）.style.backgroundColor=“#FF0000”


您忘记了使用
文档.getElementById（“”）.style.backgroundColor=“#FF0000”

您忘记了
.style


<head runat="server">
<title>My Page</title>

<script type = "text/javascript" >

    function changeColor() {
        document.getElementById('<%= txta.ClientID %>').backgroundColor="#FF0000";
        alert( '<%= txta.ClientID %>');
    }
</script>

</head>



 txta.Attributes.Add("onblur", "changeColor();")