如何在按钮单击事件中调用javascript函数 [英] How to call javascript function in a button click event

问题描述

亲爱的先生



我想在提交数据之前验证一些下拉列表值。我必须检查下拉列表是否包含值，并且值必须不等于两个下拉列表。





这是我的Javascript代码。



< script type =text / javascript>

function clicke（）{

var ddl1 = document.getElementById（ddlDoctor）;

var ddl2 = document.getElementById（ddlDoctor2）;

var ddl3 = document.getElementById（ddlDoctor3）;

var ddl4 = document.getElementById（ddlDoctor3）;

var txtNo = document.getElementById（txtNoPerson）;

alert（txt）;

if（txtNo == 1）{

if（ddl1.selectedIndex！= -1）{

alert（Select Value ...）;



}

}

否则if（txtNo = 2）{

if（ ddl1.selectedIndex！= -1&& ddl2.selectedIndex！= -1）{

if（ddl1.options [ddl1.selectedIndex] .value == ddl2.options [ddl2.selectedIndex] .value）

提醒（'数据相同'）;



}

提醒（选择价值......）;

}

else {return true;}



}

< / script>



我尝试了什么：



我称之为clicke（）onClientClick事件：



< asp：Button ID =btnConfirmText =Confirmclass =btn btn-infoOnClientClick =clicke（）OnClick =btnConfirm_Click runat =server/>

Dear sir

I want to validate some dropdown list value before submit the data. I have to check the dropdown has contain a value and the value must not same of two dropdown.


Here is My Javascript code.

<script type="text/javascript">
function clicke() {
var ddl1 = document.getElementById(ddlDoctor);
var ddl2 = document.getElementById(ddlDoctor2);
var ddl3 = document.getElementById(ddlDoctor3);
var ddl4 = document.getElementById(ddlDoctor3);
var txtNo = document.getElementById(txtNoPerson);
alert(txt);
if (txtNo == 1) {
if (ddl1.selectedIndex != -1) {
alert("Select Value...");

}
}
else if (txtNo = 2){
if (ddl1.selectedIndex != -1 && ddl2.selectedIndex != -1) {
if (ddl1.options[ddl1.selectedIndex].value == ddl2.options[ddl2.selectedIndex].value)
alert('Data same');

}
alert("Select Value...");
}
else { return true;}

}
</script>

What I have tried:

I call this clicke() onClientClick event :

<asp:Button ID="btnConfirm" Text="Confirm" class="btn btn-info" OnClientClick="clicke()" OnClick="btnConfirm_Click" runat="server" />

推荐答案

可能的修复，



添加将关键字返回到您的onclick属性

Possible Fixes,

Add return keyword to your onclick attribute

<asp:Button ID="btnConfirm" Text="Confirm" class="btn btn-info" OnClientClick="return clicke()" OnClick="btnConfirm_Click" runat="server" />

var ddl1 = document.getElementById('<%=ddlDoctor.ClientID%>'); // It should be enclosed with single quotes or double quotes

ID应为客户ID

The ID should be client ID

alert(txt);// what does that txt mean,  it should be a string value

在你的javascript中编写你的逻辑，如果验证成功，它应该返回true，否则为false，这样它就不会回发。

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