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To get the value of an input element in TypeScript: Select the input element. Type the input element as HTMLInputElement using a type assertion. Use the value property to get the element's value.
The JavaScript Set values() method returns an object of new Set iterator. This object contains the value for each element. It maintains an insertion order.
In JavaScript, we use the prompt() function to ask the user for input. As a parameter, we input the text we want to display to the user. Once the user presses “ok,” the input value is returned. We typically store user input in a variable so that we can use the information in our program.
Try... for YUI
Dom.get("gadget_url").set("value","");
with normal Javascript
document.getElementById('gadget_url').value = '';
with JQuery
$("#gadget_url").val("");
document.getElementById('gadget_url').value = '';
The following works in MVC5:
document.getElementById('theID').value = 'new value';
Depending on the usecase it makes a difference whether you use javascript (element.value = x) or jQuery $(element).val(x);
When x is undefined jQuery results in an empty String whereas javascript results in "undefined" as a String.
document.getElementById('gadget_url').value = 'your value';
I'm not using YUI, but my issue was that I had duplicate ID's on the page (was working inside a dialog and forgot about the page underneath).
Changing the ID so it was unique allowed me to use the methods listed in Sangeet's answer.
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