Store values in C# and populate in Javascript

Question

I am working in asp.net 1.1 site.

My requirement is : On post back I have some data, which I want to store in some variable. And in javascript i want to add those info to a drop down list.

Ex :

The data coming from post back call is :

Text        Value
One             1
two             2
three           3

I want to store them in some variable and assign them to a drop down list in JAVASCRIPT based on a condidtion.

The code I am using to keep the value in C# is:

StringBuilder sb = new StringBuilder();
sb.Append("<script>");
sb.Append("var test = [];");
for(int i=0; i < Engine.Length; i++)
{
    sb.Append("var obj = {text:" + Engine[i][0] + ","  + "value:" + Engine[i][1] +"};");
    sb.Append("test.push(obj);");
}
sb.Append("</" + "script>");

this.RegisterStartupScript("ownHtml", sb.ToString());

And adding the value to drop down list in JAVASCRIPT as:

for (var count = 0; count < test.length; count++)
{
    dlEngine.options[count] = new Option(test[count].text, test[count].value);
}

But it is not working.

What error do you get? And why are you declaring obj multiple times? — Paweł Reszka
– Paweł Reszka, Commented Aug 28, 2013 at 7:32

Teddy · Accepted Answer · 2013-08-28 08:53:53Z

1

Besides @i100 's answer, also need to modify the server side code, you've missed the quotes.

sb.Append("var obj = {text:'" + Engine[i][0] + "',"  + "value:" + Engine[i][1] +"};");

answered Aug 28, 2013 at 8:53

Teddy

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1 Comment

Basic Over a year ago

Plus don't forget to escape properly otherwise this is an injection attack - what happens if (somehow) one of your values contained quotes? Imagine this if the value was Something'};alert('security fail');//... You'd get var obj = {text:'Something'};alert('security fail');//... See the answers here for some solutions

i100 · Accepted Answer · 2013-08-28 07:31:44Z

0

instead of for (var count = 0; count < test.length; count++)

{
    dlEngine.options[count] = new Option(test[count].text, test[count].value);
}

use something like

for (var count = 0; count < test.length; count++){
    var opt = document.createElement('option');
    opt.value = test[count].value;
    opt.innerHTML = test[count].text;
    dlEngine.appendChild(opt);
}

answered Aug 28, 2013 at 7:31

i100

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