我对下拉验证有疑问 [英] I have question about the Dropdown Validation

问题描述

Flowing Dropdown Validation不起作用（Tab键或移动光标）？什么是错误。有人plz帮助我??数据绑定此下拉菜单。

Flowing Dropdown Validation Not work( tabbing or by moving the cursor)?? what is the error.anyone plz help me??data bound this dropdown.

function LoseFocus(ddlElem) {

         ddlElem.blur();
         var val = ddlElem.options[e.selectedIndex].value;
         if (val == "" || val == "Select")
             alert('Error');

     }

-------------------------- -------------------------------------------------- ----------------

--------------------------------------------------------------------------------------------

<asp:DropDownList ID="DropDownCountry" runat="server" AutoPostBack="true"

                      CssClass="input" Height="20px"

                      onselectedindexchanged="DropDownCountry_SelectedIndexChanged" TabIndex="18"

                      Width="99%"  onchange="LoseFocus(this);" >
                  </asp:DropDownList>

---------- -------------------------------------------------- ----------------------------------



DropDownCountry.Attributes.Add（onchange，LoseFocus（this））;

----------------------------------------------------------------------------------------------

DropDownCountry.Attributes.Add("onchange", "LoseFocus(this)");

推荐答案

首先注意到的一个重要的事情就是你的登记事件在我看来两次了>
这里

DropDownCountry.Attributes.Add（onchange，LoseFocus（this ））;

和

onchange =LoseFocus（this）;在aspx中


从你的代码
我理解的是下拉丢失焦点你想要验证下拉列表请在下面执行相同的

的onblur = LoseFocus（本）;使onblur而不是onchage。以下是更新javascript方法



功能LoseFocus（ddlElem）{



ddlElem.blur（）;

var val = ddlElem.options [ddlElem.selectedIndex] .value;

if（val ==|| val ==选择）

alert（''错误''）;



}



如果您需要更多帮助，请告诉我

First importtant thing to notice is your registering event onchage twice i
Here
DropDownCountry.Attributes.Add("onchange", "LoseFocus(this)");
and
onchange="LoseFocus(this);" in aspx

from your code what i understand is on dropdown lost focus you want validate dropdown please do it below for same
onblur="LoseFocus(this);" make onblur instead of onchage. and below is update javascript method

function LoseFocus(ddlElem) {

ddlElem.blur();
var val = ddlElem.options[ddlElem.selectedIndex].value;
if (val == "" || val == "Select")
alert(''Error'');

}

Please let me know if you need more help

这篇关于我对下拉验证有疑问的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！