I'm trying to get the value in my input field to be put into my post statement to be sent to my php file to update the record without reloading the page. It works fine with static information that I put in but when I want to select what I have typed in the input box, i can't get it to work. Nothing happens.
<script src="../jquery.js"></script>
<script type="text/javascript">
function editItem() {
catno = $("#catno").attr('value');
id = $("#id").attr('value');
$.post('writeToDB.php', {
id: id,
catno: catno
});
}
</script>
</head>
<body>
<form id="foo">
<input type="hidden" value="<?php echo $row_Recordset1['ID']; ?>" name="id"
id="id" />
<input type="text" value="<?php echo $row_Recordset1['CAT_NO']; ?>" name="catno"
id="catno" onchange="editItem();" />
</form>
I'm new to this javasrcipt world and jquery but I'm at the piont of pulling my hair out. I'm probably doing something really stupid
Thanks
Change
catno = $("#catno").attr('value');
id = $("#id").attr('value');
to
var catno = $("#catno").val();
var id = $("#id").val();
Use .val() to retrieve the value of an input.
You should also prefix your locally declared variables with var - this question/answer has a good explanation why
call val() method
id = $("#id").val();
val() method get the current value of the first element in the set of
matched elements
so your code will be
function editItem() {
var catno = $("#catno").val();
var id = $("#id").val()
$.post('writeToDB.php', {
id: id,
catno: catno
});
}
Use .val() :
http://api.jquery.com/val/
Related
I want to pass js variable into hidden form field value. I set value using php echo code but it is not working.
js variable :-
<script type="text/javascript"> var demo = 1; </script>
html :-
<input type="hidden" name="demo_val" value="<?php echo <script>demo</script>" id="demo_val"/>
and in js file call hidden field value :-
$('#demo_val').val();
but it is not working...
How to do it..?
Remove this <?php echo <script>demo</script> from hidden field and leave it blank.
Write followed code
var demo =1;
$('#demo_val').val(demo);
in your script.
You can get value by
var field_vemo = $('#demo_val').val();
Put
document.getElementById("demo_val").value = demo;
in your javascript section
you should pass the variable since javascript yo input hidden, not it´s good idea pass the variable with , you can use jQuery :
var demo = "hola";
$('#demo_val').val(demo);
Now input with name demo_val should have the value "hola"
If you like get the value you can
var valueDemo = $('#demo_val').val();
try this
<input type="hidden" name="demo_val" value="" id="demo_val"/>
<script type="text/javascript">
var demo = 1;
$(document).ready(function() {
$('#demo_val').val(demo);
});
</script>
I'm trying to pass a JavaScript variable to the value of an hidden input button to use in my PHP file output.
My HTML is:
<input type = "hidden" id = "location2" name = "location2" value = ""/>
I'm using this onclick="myFunction();" in my "Submit Form" input to run the function as it is not able to be done in the window.load()
My JavaScript below is calling indexes from another function and assigning the text to the variable 'location' (I know this sounds strange but it was the only way I have got it to work so far):
function myFunction() {
var x = document.getElementById("box2").selectedIndex;
var y = document.getElementById("box2").options;
var location=(y[x].text);
document.getElementById("location2").value=(location);
}
Any help would be hugely appreciated as I am really struggling and have been working on this for some time (as you can probably tell, I dont really know what I'm doing) - I just need to call the value of this variable into my PHP file output and the majority of my web form is completed.
Thanks very much
Marcus
I've just changed my HTML as follows
I've removed myFunction from my submit
I've added the following HTML button:
<button onclick="myFunction();" id = "location2" name = "location2" value="">Click me</button>
The variable is now passing!!!! The only problem is when I press the onclick button, it is now submitting my form!!
Is it okay for me to replace my previous submit button with this code??
THANKS TO EVERYONE FOR THEIR HELP ON THIS!!
I Was not sure what you doing but below example may help you. It will post the value as well as the option text.
Here we are using print_r to print the $_POST array from the AJAX Request. using this method, you should be able to debug the issue.
<!DOCTYPE html>
<html>
<body>
<?php if($_POST) {
print_r($_POST); die;
} ?>
<form name="" id="" method="post" >
Select a fruit and click the button:
<select id="mySelect">
<option>Apple</option>
<option>Orange</option>
<option>Pineapple</option>
<option>Banana</option>
</select>
<input type = "hidden" id = "location2" name = "location2" value = ""/>
<input type = "hidden" id = "locationname" name = "locationname" value = ""/>
<button type="submit" id="submit">Display index</button>
</form>
<script>
function myFunction() {
var x = document.getElementById("mySelect").selectedIndex;
var y = document.getElementById("mySelect").options;
//alert("Index: " + y[x].index + " is " + y[x].text);
document.getElementById("location2").value=(y[x].index);
document.getElementById("locationname").value=(y[x].text);
//alert($("#location2").val());
}
var submit = document.getElementById('submit');
submit.onsubmit = function(e){
myFunction();
};
</script>
</body>
</html>
i'm assuming your form method is 'POST' and action value is the same php page where you are expecting to see the 'location2' hidden input value, if that is the case, you can use $_POST['location2'] to get the value in that php page.
Yes it is fine to use button tag by default it acts like the submit button inside the form tag. You can also make it act like button(won't submit the form) by using the attribute type='button'.
Edited
button or input type='submit' can submit the form only when it is placed within the form tag(without javascript).
<form action='http://www.stackoverflow.com/'>
<button>stackoverflow</button> <!-- this works -->
</form>
<form action='http://www.stackoverflow.com/'></form>
<button>stackoverflow</button><!-- this won't work -->
var go = function() {
document.forms[0].submit();
};
<form action='http://www.stackoverflow.com/'></form>
<button onclick='go()'>stackoverflow</button><!-- still works -->
I'm not sure if this is possible, or if I am doing it the wrong way?
I have a form that when submitted, should send the user to a URL depending on the input.
e.g If the users inputs '2', the URL should be books/itemView?id=2
I have created a var = id, which takes the search input box data. Is it possible to add this variable to my current form action? Perhaps there is a more efficient way?
My current code is as follows;
<form id="search" action="<?php echo URL; ?>books/itemView?id=" method="post">
<input type="text" name="search" id="demo"/>
<input type="submit" value="Submit">
</form>
My JS
$(document).ready(function(){
var id = $('#search').val();
});
Quite new to JS so any help appreciated.
JS should be
$('#search').on('submit', function() {
var id = $('#demo').val();
var formAction = $('#search').attr('action');
$('#search').attr('action', formAction + id);
});
If they enter 2 in the search input then your id will be appended to your url like:
url?search=2
So maybe you want to change the name of your search input to id or add another input field.
<form id="search" action="<?php echo URL; ?>books/itemView" method="post">
<input type="text" name="id" id="demo"/>
<input type="submit" value="Submit">
</form>
That should be all you need no jquery or javascript necessary.
When you submit it should result in:
books/itemView?id=2(or whatever is in the search/id input when you click submit)
Hmm, you can try with that:
$(document).ready(function(){
var $form = $('#search');
var id = $form.val();
var $search = $('#demo');
var originalAction = $search.attr('action');
$form.on('submit', function() {
$search.attr('action', originalAction + id);
});
});
Before submitting the form, jQuery's on('submit', handler) function executes the code in handler modifying the attribute action that you want.
originalAction variable stores the content of the action attribute that was partially generated in php, then you append your id dynamically created with js.
I'm fairly new to javascript and have a question about how to get a value of an input field without submitting a form. I have the following small piece of code, which I'm using in combination with a realtime-validation script to validate the fields.
<form name="FormName" method="post" />
<input type="text" id="nameValidation" value="HelloWorld" />
<script type="text/javascript">
var NameValue = document.forms["FormName"]["nameValidation"].value;
</script>
</form>
I want the var NameValue to be the value of what you type into the input field so I can use it in the message which appears after the validation. When I change the value of the input field without submitting the form, the var NameValue is stil set to "HelloWorld". After doing some research I found out I could solve it using jQuery and it's function serialize(). Is there a way to do this without jQuery?
Without jQuery :
var value = document.getElementById('nameValidation').value;
The syntax you had would be usable to get an input by its name, not its id.
If what you want is to use this value when it changes, you can do that :
var nameValidationInput = document.getElementById('nameValidation');
function useValue() {
var NameValue = nameValidationInput.value;
// use it
alert(NameValue); // just to show the new value
}
nameValidationInput.onchange = useValue;
nameValidationInput.onblur = useValue;
Your code works. It assign value of your input field to var NameValue. What you explained and what JQuery serialize does are two different things.
Everything you need is to assign your code to right event:
<form name="FormName" method="post" />
<input type="text" id="nameValidation" value="HelloWorld" onchange="myFunction()"/>
</form>
<script type="text/javascript">
function myFunction(){
var NameValue = document.forms["FormName"]["nameValidation"].value;
alert(NameValue);
}
</script>
see the JSFiddle.
use the onchange or onblur event to call this code:
var NameValue = document.forms["FormName"]["nameValidation"].value;
This way it will get activated when the cursor leaves the textbox
<input type="text" id="nameValidation" value="HelloWorld" onblur="changeVal();" />
<script type="text/javascript">
function changeVal() {
var NameValue = document.forms["FormName"]["nameValidation"].value;
alert(NameValue);
}
</script>
In your example, the variable only gets the value assigned to it at that moment in time. It does not update when the textbox updates. You need to trigger a function [onchange or onblur or keypress] and reset the variable to the new value.
<form name="FormName" method="post" />
<input type="text" id="nameValidation" value="HelloWorld" />
<script type="text/javascript">
var myTextbox = document.getElementById("nameValidation");
var nameValue = myTextbox.value;
myTextbox.onchange = function() {
nameValue = myTextbox.value;
};
</script>
</form>
You can let your client-side code respond to a change in the value of the textbox, like so:
$(document).ready(function(){
$("#nameValidation").on('change', function() {
var value = $("#nameValidation").value;
//do your work here
}
})
I have a hidden field
<input type="hidden" name="smname" />
Now i have a function in a js file count(); How can I assign the return value to the hidden field?
You could give your hidden field an unique id:
<input type="hidden" name="smname" id="smname" />
and then in javascript:
document.getElementById('smname').value = count();
where count is the function you want to invoke and which returns the value:
var count = function() {
return 'some value';
};
Try:
document.getElementsByName('smname')[0].value = count();
You want to use code such as
document.getElementById("name")
then deal with it as an object. remember to define a name/id for your html element.
If you give the input element an id attribute you will be able to get a reference to it in javascript using the document.getElementById() method then set the value property of the element
HTML
<input id="surname" type="hidden" name="smname" />
Javascript
var input = document.getElementById("surname");
input.value = count();