How to get Custom Property from ASP.NET Textbox using javascript?

I have created a cu开发者_JS百科stom text box with property "key"(ASP.NET C#).I want to get the value of this property "key" using java script.How can I do this?

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Not sure what you are asking.

if you have a textbox rendered like so:

<input type="text" id="foo" key="somekey" text="Hello" />

You could get the value of "key" in JS like so:

document.getElementById('foo').getAttribute('key')

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If you are using jquery than for this will help you.

$("#tb1").attr("key")

for this textbox

<input type="text" id="tb1" key="mykey" text="" />