jQuery .val() does not work on html chunk? - javascript

I cant figure out, why this code does not work as expected:
var $obj = jQuery('<div>xx<input type="text" value="" />xx</div>');
$obj.find('input').val('testing');
console.log($obj.html());
The resulting output is without any change - i.e. no change in value. But append() and other functions works fine. What could be wrong?

value is an atrribute of the input dialog.
Doing .val(...) changes the value property and not the value in the DOM.
See here for the differences between properties and attributes.
If you wanted to see a physical change in the value attribute you could do something like this:
var $obj = jQuery('<div>xx<input type="text" value="" />xx</div>');
$obj.find('input').attr('value','testing');
console.log($obj.html());
Demo: http://jsfiddle.net/maniator/YsZLt/

The "value"-attribute maps to .defaultValue property.
There is no attribute that maps to .value property. However, on non-dirty inputs
inputs, you can set the attribute "value" (and obviously, .defaultValue) and that will be reflected
in the property .value.
Since your input is non-dirty, you can do this
var $obj = jQuery('<div>xx<input type="text" value="" />xx</div>');
$obj.find('input').prop('defaultValue', 'testing');
console.log($obj.html());
//xx<input type="text" value="testing">xx

Related

Changing input type="number" - value changes, but not the front-end number [duplicate]

I had thought these two were the same, but they appear to not be. I've generally been using $obj.attr("value") to work with form fields, but on the page I'm currently building, $obj.attr("value") does not return the text I enter in my field. However, $obj.val() does.
On a different page I've built, both $obj.attr("value") and $obj.val() return the text entered in the form field.
What could account for $obj.attr("value") working as expected in one case but not in another?
What is the proper way to set and retrieve a form field's value using jQuery?
There is a big difference between an objects properties and an objects attributes
See this questions (and its answers) for some of the differences: .prop() vs .attr()
The gist is that .attr(...) is only getting the objects value at the start (when the html is created). val() is getting the object's property value which can change many times.
Since jQuery 1.6, attr() will return the original value of an attribute (the one in the markup itself). You need to use prop() to get the current value:
var currentValue = $obj.prop("value");
However, using val() is not always the same. For instance, the value of <select> elements is actually the value of their selected option. val() takes that into account, but prop() does not. For this reason, val() is preferred.
PS: This is not an answer but just a supplement to the above answers.
Just for the future reference, I have included a good example that might help us to clear our doubt:
Try the following. In this example I shall create a file selector which can be used to select a file and then I shall try to retrieve the name of the file that I selected:
The HTML code is below:
<html>
<body>
<form action="#" method="post">
<input id ="myfile" type="file"/>
</form>
<script type="text/javascript" src="jquery.js"> </script>
<script type="text/javascript" src="code.js"> </script>
</body>
</html>
The code.js file contains the following jQuery code. Try to use both
of the jQuery code snippets one by one and see the output.
jQuery code with attr('value'):
$('#myfile').change(function(){
alert($(this).attr('value'));
$('#mybutton').removeAttr('disabled');
});
jQuery code with val():
$('#myfile').change(function(){
alert($(this).val());
$('#mybutton').removeAttr('disabled');
});
Output:
The output of jQuery code with attr('value') will be 'undefined'.
The output of jQuery code with val() will the file name that you selected.
Explanation:
Now you may understand easily what the top answers wanted to convey. The output of jQuery code with attr('value') will be 'undefined' because initially there was no file selected so the value is undefined. It is better to use val() because it gets the current value.
In order to see why the undefined value is returned try this code in your HTML and you'll see that now the attr.('value') returns 'test' always, because the value is 'test' and previously it was undefined.
<input id ="myfile" type="file" value='test'/>
I hope it was useful to you.
Let's learn from an example.
Let there be a text input field with default value = "Enter your name"
var inp = $("input").attr("value");
var inp = $("input").val();
Both will return "Enter your name"
But suppose you change the default text to "Jose" in your browser.
var inp = $("input").attr("value");
will still give the default text i.e. "Enter your name".
var inp = $("input").val();
But .val() will return "Jose", i.e. the current value.
Hope it helps.
The proper way to set and get the value of a form field is using .val() method.
$('#field').val('test'); // Set
var value = $('#field').val(); // Get
With jQuery 1.6 there is a new method called .prop().
As of jQuery 1.6, the .attr() method returns undefined for attributes
that have not been set. In addition, .attr() should not be used on
plain objects, arrays, the window, or the document. To retrieve and
change DOM properties, use the .prop() method.
In order to get the value of any input field, you should always use $element.val() because jQuery handles to retrieve the correct value based on the browser of the element type.
jQuery('.changer').change(function () {
var addressdata = jQuery('option:selected', this).attr('address');
jQuery("#showadd").text(addressdata);
});
jQuery(".morepost").live("click", function() {
var loadID = jQuery(this).attr('id'); //get the id
alert(loadID);
});
you can also get the value of id using .attr()
this example may be useful:
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js"></script>
</head>
<body>
<input id="test" type="text" />
<button onclick="testF()" >click</button>
<script>
function testF(){
alert($('#test').attr('value'));
alert( $('#test').prop('value'));
alert($('#test').val());
}
</script>
</body>
</html>
in above example, everything works perfectly. but if you change the version of jquery to 1.9.1 or newer in script tag you will see "undefined" in the first alert.
attr('value') doesn't work with jquery version 1.9.1 or newer.
Example more... attr() is various, val() is just one! Prop is boolean are different.
//EXAMPLE 1 - RESULT
$('div').append($('input.idone').attr('value')).append('<br>');
$('div').append($('input[name=nametwo]').attr('family')).append('<br>');
$('div').append($('input#idtwo').attr('name')).append('<br>');
$('div').append($('input[name=nameone]').attr('value'));
$('div').append('<hr>'); //EXAMPLE 2
$('div').append($('input.idone').val()).append('<br>');
$('div').append('<hr>'); //EXAMPLE 3 - MODIFY VAL
$('div').append($('input.idone').val('idonenew')).append('<br>');
$('input.idone').attr('type','initial');
$('div').append('<hr>'); //EXAMPLE 3 - MODIFY VALUE
$('div').append($('input[name=nametwo]').attr('value', 'new-jquery-pro')).append('<br>');
$('input#idtwo').attr('type','initial');
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<input type="hidden" class="idone" name="nameone" value="one-test" family="family-number-one">
<input type="hidden" id="idtwo" name="nametwo" value="two-test" family="family-number-two">
<br>
<div></div>
jquery - Get the value in an input text box
<script type="text/javascript">
jQuery(document).ready(function(){
var classValues = jQuery(".cart tr").find("td.product-name").text();
classValues = classValues.replace(/[_\W]+/g, " ")
jQuery('input[name=your-p-name]').val(classValues);
//alert(classValues);
});
</script>
If you get the same value for both property and attribute, but still sees it different on the HTML try this to get the HTML one:
$('#inputID').context.defaultValue;
In attr('value') you're specifically saying you're looking for the value of an attribute named vaule. It is preferable to use val() as this is jQuery's out of the box feature for extracting the value out of form elements.
I have always used .val() and to be honest I didnt even know you could get the value using .attr("value"). I set the value of a form field using .val() as well ex. $('#myfield').val('New Value');

Testcafé - getting content of invisible <input>'s value attribute

I need to get the value of an <input>, specifically the stuff that is held inside its value attribute.
However, the input is not visible, so that seems to be a problem for testcafé.
Does anyone know how to work around that? Is there a special option you can use with the Selectors to make it work?
Thanks for helping me out, I appreciate any help!
Got it, simply declare a Selector like this let yourInputs = Selector('input[type="hidden"]'), this will get all hidden inputs and return a NodeList which you can iterate over in your test.
If you want to be more specific and select over an ID or name, do it like #lumio.
Then you can access the value in your test run with an await yourInputs.value.
I guess you mean a hidden input element as in <input type="hidden" /> and you want to receive the value before you're sending it to your Node application. You can use querySelector for this.
console.log( document.querySelector( 'input[name=test]' ).value );
<input type="hidden" name="test" value="hello world" />
For TestCafé you got the Selector-constructor which creates a selector.
As fweidemann14 pointed out, you can do the following:
const hiddenInputs = Selector( 'input[type="hidden"]' );

Undefined option name javascript

I have the following code. But the alert does not show the name of the option, instead it shows "undefined". For value, it shows the correct content.
<select id="test" name="select_decision" onchange="javascript:
var activeText = this.options[this.selectedIndex].value
var activeOption = this.options[this.selectedIndex].name;
alert(activeOption);
">
An example of one option is:
<option value="test" name="test_name">Test</option>
Been looking on google for an answer but cannot find one!
option elements don't have a name attribute, so there's no reflected property for it, so optionElement.name is undefined.
While you could get the value of that attribute via optionElement.getAttribute("name"), in general if you want to add a custom attribute to an element, you should use the data-* prefix.
Try to use htmlElement.getAttribute(attrName). So, in your case try to use
var activeOption = this.options[this.selectedIndex].getAttribute('name');
instead of your
var activeOption = this.options[this.selectedIndex].name;

To Replace dynamic value using jquery

I have input field like
<input type="text" name="time[23][34][]" value="">
name of input field is dynamic. Means it might be time[23][34][],time1[11][33][],time2[45][22][] etc
Now I want to change it to multidimension to singledimension like
time[]
time1[]
time2[]
I have tried below code:
$('input').attr('name').replace(/(\[|\])/g, '\\$1')
How can i replace it using jquery or javascript?
this may help you:
https://jsfiddle.net/s033kv43/
var attrib = $('input').attr('name').replace(/[\[|\]]/g, '');
$('input').attr('name', attrib);
i get the name attribute and replace the brackets with nothing, then set the name attribute.
Dont forget to adjust this code, so its alters the correct input-fields

Other than class, id and text, how else can I pass a variable within an element in jQuery?

I have a situation where class and id are taken, but I need to pass a variable in jQuery. How do you recommend?
HTML
<input
type="text"
id="cannot_change_this"
class="rather_not_append_extra_classes_just_for_a_variable"
value="Full Text Name"
hash="ABCDE">
Each value, when selected via autocomplete has an associated hash. In the example above the value might be Full Text Name, but this is not unique. What I really need to pass is the hash: ABCDE.
I can't change the id and I'd rather not add extra classes and have to filter out the ones used for styles to get my hash. And since it's an input I can't use .text() either.
How else can I pass ABCDE hash to jQuery?
Look at using jQuery's data method
http://api.jquery.com/jQuery.data/
You can calculate the hash of the value in javascript, then set it to the input's data.
Also if using HTML5, you can specifically declare data attributes in the HTML. So you could use a property like data-hash=HASH to set your data.
Alternatively, if you don't care about comliance or maybe you aren't using HTML5, you could just set your own attribute like
<input type="text" id="cannot_change_this"
class="rather_not_append_extra_classes_just_for_a_variable"
value="Full Text Name" hash="ABCDE" />
And read it with jQuery like this:
var hash = $('input#idOfInput').attr('hash');
If i got it right.
Setting the value:
$("#cannot_change_this").data("hash", hashValue);
Getting the value later:
$("#cannot_change_this").data("hash");
You could just use the title attribute:
<input type="text" id="cannot_change_this"
class="rather_not_append_extra_classes_just_for_a_variable"
value="Full Text Name"title="ABCDE" />
it is a standard attribute for all inputs.
you can have something like:
jQuery(document).ready(function(){
//SET:
jQuery("#cannot_change_this").attr("new-value", "ABCDE");
//READ:
var val = jQuery("#cannot_change_this").attr("new-value");
alert(val);
});

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