I want to put a value in a text box.
function open_popup(date_today){
document.getElementById('txtstart').value = date_today;
}
and a html input
<input type=text required name='txtstart' style='width:150px' value=''>
The text box is in a div that is hidden, and is seen when the open_popup () function is executed. I do not know why this does not work.
You are looking for the element by ID ( getElementById ), but the element has no ID ...
You can use this:
document.querySelector("[name='txtstart']").value = date_today;
or give an element ID by adding id="txtstart" to the input HTML.
Example:
function open_popup(date_today) {
document.querySelector("[name='txtstart']").value = date_today;
}
open_popup('2014-10-14');
alert(document.querySelector("[name='txtstart']").value);<div style="display:none;">
<input type="text" required name="txtstart" style="width:150px" value="">
</div>change to:
function open_popup(date_today){
$("#txtstart").val(date_today);
}
and no input:
<input type=text required name='txtstart' id='txtstart' style='width:150px' value=''>
To use document.getElementById('exemplo') you have to pass the ID of the input box, not the name. You can do this:
<input type=text required name='txtstart' id='txtstart' style='width:150px' value=''>
Add this (onsubmit="return valida_form (this)") in your form.
EX:
<form name="index" method="post" action="nextpage.php" id="index" onsubmit="return valida_form(this)">