How to modify the value of text input with js/jquery?
I would like to dynamically modify the values of certain form elements, more specifically certain input开发者_开发技巧 text fields. So far, whenever I load my html page, I am just getting the blank input field, but I am expecting it to contain the value of 1. Here is an example of how I am trying to do this.
<!DOCTYPE HTML>
<HTML>
<HEAD>
<script type="text/javascript" src="javascript/jquery-1.6.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
var myForm = $(this).getElementById('form1');
myForm.elements['Q01'].value = '1';
});
</script>
</HEAD>
<BODY>
<form id="form1">
<input type="text" name="Q01" maxlength="1" />
</form>
</BODY>
</HTML>
The reason this needs to be done dynamically is because the value of form could be different every time. Am I even approaching this correctly? Suggestions on how I can achieve my intended functionality?
-- EDIT --
None of the solutions seem to be doing the trick. Here is an update of my code:
<!DOCTYPE HTML>
<HTML>
<HEAD>
<script type="text/javascript" src="javascript/jquery-1.6.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
//$("#Q01").val("1");
$("#form1 input[name='Q01']").val("1");
//$("input[name='Q01']").val('1');
});
</script>
</HEAD>
<BODY>
<form id="form1">
<input type="text" id="Q01" name="Q01" maxlength="1" />
</form>
</BODY>
</HTML>
I am expecting when I load the page, that the input text will have 1 in it. But the input text keeps showing up empty. Any ideas?
-- EDIT --
Here is a solution derived from the answers from below that I like:
<!DOCTYPE HTML>
<HTML>
<HEAD>
<script type="text/javascript" src="javascript/jquery-1.6.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#Q01").val("1");
});
</script>
</HEAD>
<BODY>
<form id="form1">
<input type="text" id="Q01" name="Q01" maxlength="1" />
</form>
</BODY>
</HTML>
If you are using jQuery you could just change the id attribute to name in the input elements and then do something like this:
$('#Q01').val('1')
The val method sets the value sou can find more here: http://api.jquery.com/val/
You've got your ready handler correct. One of the great things about jQuery is its selector engine. I recommend taking a look at the documentation to help familiarize yourself with it.
To do what you want, I'd recommend something like this:
$(document).ready(function() {
$("#form1 input[name='Q01']").val("1");
});
The #form1 is the same as document.getElementById("form1"). The input[name='Q01'] grabs all input elements that have a name attribute equal to Q01. The .val method sets the selected elements value to the string 1.
$(document).ready(function(){
$("form input[name='Q01']).val('1');
)};
This should work:
$("input[name='Q01']").val('1');
But why not to set id's to your inputs?
Hope it works
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