如何从dropdownlist调用javascript函数？ [英] How to call javascript function from dropdownlist?

问题描述

I have javscript function which I want to call from dropdownlist.If I call javascript function from onchange event of dropdownlist from page_load,my dropdownlist's selectedIndexchanged event does not fire.How to handle it?.I want to call both javascript function and selectedindexchanged from dropdownlist.

// Javascript

< script language =Javascripttype =text / javascript> < br $> b $ b函数（）

{

}

< / script>

< br $>
// Page_load（）

ddlSubject.Attributes.Add（onchange，return CallSubject（））;

//



protected void ddlSubject_SelectedIndexChanged（object sender，EventArgs e）

{



}

假设我有按钮控制并想从button调用javascript函数。我将调用javascript函数按钮的onclientclick事件，之后我的按钮的点击事件触发。我想在下拉列表中那样。



我尝试了什么：



/ Javascript

< script language =Javascripttype =text / javascript>

function（ ）

{

}

< / script>



// Page_load（）

ddlSubject.Attributes.Add（onchange，return CallSubject（））;

//



protected void ddlSubject_SelectedIndexChanged（object sender，EventArgs e）

{



}

//Javascript
<script language="Javascript" type="text/javascript">
function()
{
}
</script>

//Page_load()
ddlSubject.Attributes.Add("onchange", "return CallSubject()");
//

protected void ddlSubject_SelectedIndexChanged(object sender, EventArgs e)
{

}
Suppose I have button control and want call javascript function from button.I will call javascript function from button's onclientclick event,after that my button's click event fire.I want like that in dropdownlist.

What I have tried:

/Javascript
<script language="Javascript" type="text/javascript">
function()
{
}
</script>

//Page_load()
ddlSubject.Attributes.Add("onchange", "return CallSubject()");
//

protected void ddlSubject_SelectedIndexChanged(object sender, EventArgs e)
{

}

推荐答案

删除返回关键字

remove the return keyword

ddlSubject.Attributes.Add("onchange", " CallSubject()");

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