javascript for dropdown

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C#

function DiseaseChange() {
           var disease = document.getElementById("<%=DDLDisease.ClientID %>").selectedindex;
           if (confirm("Are You sure yow want to change disease?") == true) {

           }
           else {
               document.getElementById("<%=DDLDisease.ClientID %>").selectedindex = disease;
               return false;
           }

this is the javascript i wrote for dropdownlist

when i am clicking on cancel of the alert the value of disease dropdown should not be change...but this is not happning..value of drop down is getting change..please help me out from this problem..

Posted 13-Mar-13 2:53am

ujali

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Comments

bbirajdar 13-Mar-13 9:03am

Remove this part from the above code
else {
document.getElementById("<%=DDLDisease.ClientID %>").selectedindex = disease;
return false;
}

ZurdoDev 13-Mar-13 11:48am

I'm confused. Maybe I'm missing something or maybe you missed it. Your if statement says if they click Cancel then change the dropdown. Don't you mean if they click OK?

2 solutions

Solution 1

Use below code.

C#

function DiseaseChange() {
           var disease = document.getElementById("<%=DDLDisease.ClientID %>").selectedindex;
           if (confirm("Are You sure yow want to change disease?") == true) {
               document.getElementById("<%=DDLDisease.ClientID %>").selectedindex = disease;
} else{
    return false;
}

Posted 13-Mar-13 7:46am

Rupesh Kumar Tiwari

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sri senthil kumar · Accepted Answer · 2013-03-13T21:22:00

When I looked your code, I found a small issue.
if your calling this method onchange of the dropdown then it wont work because the selected index will be the current index selected. So i have added a code snippet below which takes the selected index on pageload itself. May be you could understand if you take a look at it. If you face any problem with this reply me.

JavaScript

function DiseaseChange(id) {
        var ddlObj = document.getElementById(id);
        var index = ddlObj.selectedIndex;
        if (confirm("Are You sure yow want to change disease?") == true) {
            //your code
        }
        else {
            ddlObj.selectedIndex = PREVIOUS_INDEX;
            //your code
        }
    }
    var PREVIOUS_INDEX = 0;
    $(document).ready(function () {
        var ddlObj = document.getElementById(id);
        PREVIOUS_INDEX = ddlObj.selectedIndex;
    });