Question

How can I set the value of a textBox value using Javascript?

I can read the value of the txtUserName field in my AJAX method. But in the two commented rows give an error:

  function handle_geolocation_query(position) {

       // $("input#MainContent_txtEnlem").val() = position.coords.latitude;
       // $("input#MainContent_txtBoylam").val() = position.coords.longitude;
        PageMethods.SendLocation($("input#MainContent_txtUserName").val(), position.coords.latitude, position.coords.longitude);
    }

I’m using jQuery 1.4.1.

Answer 1

The error in you code is that you are assigning the value to function. What you should do is pass the value as agrument, so your code will be:

$("#MainContent_txtEnlem").val( position.coords.latitude);
$("#MainContent_txtBoylam").val(position.coords.longitude);

Some other points:

• If you are making use of id then there is no need to write input#....
• This is a jQuery function. It’s not pure JavaScript.