I have the following html code
<div class="span4 child_age_box">
<input class="child_age_input" value="2">
</div>
And following jquery which I want to clone and append the block when an event is triggered.
var child_value_input= $('.child_age_input');
var add_box = function (){$('.child_ages').on("change",function(){
$(this).parent().parent().parent().find('.child_age_box').empty();
for(var i= 0; i< parseInt($(this).val()); i++){
$(this).parent().parent().parent().find('.child_age_box').append(child_value_input.clone().show().get(0).outerHTML)
}});
It seems ok , when I trigger the event. The box appears and I can put some value in it. But when I ask for the $('.child_age_input'). I can not see the value that I put in the text box. Is there something I am missing?
Don't trust the outerHTML, get the actual value with .val() instead. If the value attribute is 2 in the source code, the outerHTML will still show 2 even if you change it (at least in Chrome):
var fld = $('.child_age_input');
fld.val('3');
$(document.body).append(fld.clone());
$('.child_age_input').each(function(){
console.log(this.outerHTML, $(this).val());
// 2x <input class="child_age_input" value="2"> 3
});
http://jsfiddle.net/HQsrQ/
I am thinking this is causing the error
$(this).parent().parent().parent().find('.child_age_box').empty()
you are calling empty() so the child_age_input element is removed from the DOM
on another note instead of parent().parent() so on you can use closest()
Related
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');
I've got a huge feeling I'm simply being idiotic here, but is it me or is Js not firing in JsFiddle?
I built this snippet here but can't seem to get it to fire. Im probably missing something super obvious, but would be grateful for any assistance.
HTML
<div id="col">
<h3 class="txt spacer">Dynamic input, based on select value...</h3>
<input type="text" name="field-one" class="txt stretch" />
<div class="boxes">
<input type="checkbox" id="box-2" onChange="myFunction()" checked>
<label for="box-2">Apply a name?</label>
</div>
</div>
</div>
Javascript
function myFunction() {
// Text field element.
var a = document.getElementByName('field-one');
// Checkbox element.
var b = document.getElementById('box-2');
if (b.checked) {
a.disabled = false;
a.placeholder = 'Not Applicable';
alert('Checkbox State Changed.');
} else {
a.disabled = true;
a.placeholder = 'Enter Your Full Name';
alert('Checkbox State Changed.');
}
}
JS FIDDLE
Thanks in advance for the assistance.
Regards,
-B.
EDIT
I'm an idiot. Thanks guys.
Couple of things here, it should be document.getElementsByTagName (plural) and you need to change the settings, that will embed the JS code in before the body closes.
var a = document.getElementsByName('field-one')[0];
I am using [0] here to access the very first element of the array as document.getElementsByName() will return you an array of elements if encountered multiple matching elements. If you want to select a specific one, make sure you select the DOM element in a more specific way.
And change the Load Type to
No wrap - in <body> (<head> will work as well)
Demo
The Javascript Load Type for your jsFiddle is set to onLoad. This will nest your myFunction function, and therefore won't be available in the global scope.
You can either change the Load Type, or set the variable on the window:
window.myFunction = function()....
NB: You then receive another error for getElementByName. This isn't a function of document. You're probably looking for getElementsByName.
Open the DevTools and you'll see
Uncaught ReferenceError: myFunction is not defined
at HTMLInputElement.onchange ((index):192)
Now why isn't the function defined? Perhaps it's not defined at the right spot?
Look at where you load your JavaScript and change it to:
Here's an updated fiddle. Note that I fixed a typo on line 3 getElementsByName.
First, set your seeting of javascript LOAD TYPE to head.
last, is getElementsByName not getElementByName and it would return array so you need to parse.
let a = document.getElementsByName('field-one')[0];
hope it's helpful.
I am trying to use jQuery / javascript to remove a class from a named input element if a checkbox is ticked.
I have several checkboxes, each with a accompanying hidden (on page load) text input field.
The checkbox and text input field are named "question_X" and "question_X_description" respectively. (where X is a number 0 to 100, say)
As such I'm trying to define a variable in my code that is defined as "this element's name"+"_description", and then use that to define the suitable element to remove the class from.
Here is what I've tried:
$('input:checkbox').change(function(){
var x = $(this).attr('name').'_description';
if($(this).is(":checked")) {
$('input[name="x"]').removeClass("hidden");
} else {
$('input[name="x"]').addClass("hidden");
}
});
However, nothing happens when the any checkbox is checked. Am I referencing my variable correctly?
Use your console, It will have error messages.
First issue
var x = $(this).attr('name').'_description';
^^^
That is not how you build a string in JavaScript. JavaScript does not use . to join strings. It uses +
var x = $(this).attr('name') + '_description';
Second issue
$('input[name="x"]').
You are not looking for the string you built, you are looking for an element with the name x
Needs to be
$('input[name="' + x + '"]').
$('input[name="x"]').removeClass("hidden");
Will be looking for:
<input name="x" />
Try
$(name="'+x+'").removeClass("hidden");
Use document.getElementById('element_name')
Example of HTML element:
<input type="text" id="element_name">
I am counting the number of inputs on the current document that have value. It works fine, except for when I have dynamically added more inputs. I can't get there values.
For example I may have
<input id="participant-1"/>
<input id="participant-2"/>
...
Dynamically created after button click
<input id="participant-15" />
I'll get the value of each one in a for loop like
for(var i =1 ; i <25; i++)
{
...$('input#participant-' + i).val();
}
Now when I run a for loop to check the value of each one of these inputs it only gets the values of the inputs that weren't dynamically created. I have looked at the other questions on here and I still can't see how to apply something like .on() to what I am trying to accomplish.
NEW FOLLOW UP QUESTION
ok, now I think this is where I need more clarification concerning how to use the .on.
I have a jsfiddle here: JsFiddle example
where I create new elements and on blur of all text boxes I would like to calculate how many of the elements have value and log it. Now it currently will respond from blur event with elements who were static. It doesn't work for dynamically created elements
Give it a common class:
<input class="textbox" id="participant-1"/>
<input class="textbox" id="participant-2"/>
And get it like:
var values = [];
$('.textbox').each(function(){
values.push($(this).val());
});
console.log(values)
And to answer the edit:
The Syntax should be : $(container_selector).on(event_type, target_selector, callback)
JSFiddle Demo
$('.name').on('blur', 'input', calculate_total);
Could also consider the use of the CSS attribute selector.
http://www.w3.org/TR/CSS2/selector.html#attribute-selectors
$("input[id|=participant]").each(function(){
// something
});
Using a class selector will save time here.
<input id="participant-1" class="participant"/>
<input id="participant-2" class="participant"/>
Then use a simple count call...
var count = $('.participant').length
alert ('You have ' + count + ' Counted Inputs');
//result is 2
Hope you find this useful
There should be a simple solution for this. I need to get an input element by name and set its value.
The following Javascript does not work:
x = document.getElementsByName($('#questions').val());
x.value=this.value;
Is there a simple solution using JQuery?
Description
You are mixing normal javascript and jQuery.
Use the attribute selector.
Check out my sample and this jsFiddle Demonstration
Sample
Html
<input type="text" name="nameOfTheInputElement"/>
jQuery
$(function() {
$("input[name='nameOfTheInputElement']").val("your value");
});
Edit
If you want, for some reason, change a element which name is a value in another element
then do this. jsFiddle Demonstration
Html
<input type="text" id="questions" value="nameOfTheInputElement"/>
<input type="text" name="nameOfTheInputElement"/>
jQuery
$(function() {
var name = $("#questions").val();
$("input[name='"+name +"']").val("your value");
});
More Information
jQuery - Attribute Equals Selector [name="value"]
jsFiddle Demonstration (first sample)
jsFiddle Demonstration (second sample)
A simple, pure JavaScript (and therefore faster) solution:
var x = document.getElementsByName(document.getElementById('questions').value)[0].value = this.value;
I know jQuery's tagline is 'Write less, do more', and in many cases it is true... many cases !== always, though ;-)
getElementsByName() returns a node-list, so you need to get the first one getElementsByName(...)[0]
But you are already using jQuery, so use it. Read some tutorials about the jQuery selectors
Try this
var q = $("#question").val();
var x = $("input[name='" + q + "']").val();
on the 2nd line, variable q, the name provided in input with id 'question', will be enclosed with ' and could contain any supported characters, like space, :, -, etc
If you need the value of a component regardless of its tag, you can do this:
var x = $("[name='" + q + "']").val();
Consider that this approach $("[name='" + q + "']") can return more than one element, but .val() will return only the value of the first element.
If I'm understanding your question correctly, you want to get an element by name, and the name of the element you're selecting will be specified by some dropdown or text area.
Here's my take on it:
Html
<input type="text" id="enteredName">
<button id="doTheStuff">Do the work</button>
<input name="one" value="One">
<input name="two" value="Two">
jQuery
$('#doTheStuff').click(function(){
var objectOfInterest = $('[name=\'' + $('#enteredName').val() + '\']');
alert(objectOfInterest.val());
});
Working example
Here's another working example using a dropdown to specify the selection name.
$('#form-id input[name="name-input"]').val('your value');