用于从其他下拉菜单中选择选项时选择下拉列表选项的javascript [英] javascript for selecting option of dropdownlist on selecting option from other dropdown

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问题描述

当我选择下拉列表选项时我需要javascript然后应该自动选择第二个下拉选项

解决方案

根据您的需要扩展此功能: -



函数ChngDDl2()
{
var ddlValue = document.getElementById( <%= ddl1.ClientID%>)。;
if (ddlValue == 1
{
document。 getElementById( <%= ddl2.ClientID%>)。 value = 1;
}

}


你没有为下拉列表项分配值

这是你的最终解决方案: -



函数ChngDDl2(){
var ddlValue = document.getElementById(<% = ddl1.ClientID %> )。value;
if(ddlValue ==1){
document.getElementById(<% = ddl2.ClientID %> )。value =这是aple;
}
if(ddlValue ==2){
document.getElementById(<% = ddl2.ClientID < span class =code-pagedirective>%> )。value =这是洋葱;
}

}


< asp:DropDownList ID = ddl1 onchange < span class =code-keyword> = ChngDDl2(); runat = server >
< asp:ListItem value = 1 text = 一个 > < / asp:ListItem >
< asp:ListItem = 2 text = two > < / asp:ListItem >

< / asp:DropDownList >

< asp:DropDownList ID = ddl2 runat = server >
< asp:ListItem value = 1 text = > < / asp:ListItem >
& lt; asp:ListItem value = 2 text = > < / asp:ListItem >
< / asp:DropDownList >


i need javascript when i select option of dropdownlist then option of 2nd dropdown should be automatically selected

解决方案

Expand this function with your needs:-

function ChngDDl2()
    {
         var ddlValue=document.getElementById("<%=ddl1.ClientID%>").value;
         if(ddlValue == 1)
         {
                 document.getElementById("<%=ddl2.ClientID%>").value="1";
         }

     }


you have not assigned values to dropdown listitems
This is your final soln:-

function ChngDDl2() {
       var ddlValue = document.getElementById("<%=ddl1.ClientID%>").value;
        if (ddlValue == "1") {
            document.getElementById("<%=ddl2.ClientID%>").value = "This is aple";
        }
        if (ddlValue == "2") {
            document.getElementById("<%=ddl2.ClientID%>").value = "This is onion";
        }

    }


<asp:DropDownList ID="ddl1" onchange="ChngDDl2();" runat="server">
         <asp:ListItem value="1" text="one"></asp:ListItem>
         <asp:ListItem value="2" text="two"></asp:ListItem>

</asp:DropDownList>

<asp:DropDownList ID="ddl2" runat="server">
        <asp:ListItem value="1" text=""></asp:ListItem>
        <asp:ListItem value="2" text=""></asp:ListItem>
 </asp:DropDownList>


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