I have input type text
<input type="text" name="processName">
I want to set new id to this input element using name of the input element
document.getElementsByTagName("processName")[0].setAttribute("id", "proceesOffsetId");
Which is not working
So getElementsByTagName refers to the element tag (for example: div tag, li tag, input tag, etc...). It doesn't fetch elements via the name attribute.
So in your case, to target that input element, you could do something like this:
document.getElementsByTagName("input")[0].setAttribute("id", "proceesOffsetId");
This will give the input element an id of proceesOffsetId.
Alternatively, to target the name attribute, you could use document.getElementsByName:
document.getElementsByName("processName")[0].setAttribute("id", "proceesOffsetId");
This will also give the input element an id of proceesOffsetId.
you should use getElementsByName
document.getElementsByName("processName")[0].id = "proceesOffsetId";
Instead of using getElementsByTagName, use getElementsByName which is appropriate as per your requiement.
HTML :
<input type="text" name="processName">
JS:
var x= document.getElementsByName("processName");
console.log(x);
x[0].setAttribute("id", "proceesOffsetId");
Here's the reference : https://www.w3schools.com/jsref/met_doc_getelementsbyname.asp
Related
i'm trying to get the value from the ID => vname into the variable name
and the return should be "Loren",
I tried with and without the value attribute call but doesn't work. what am i missing?
<html>
<head>
<script>
var name = document.getElementById("vname").value;
alert(name);
</script>
</head>
<body>
<p id="vname" value="firstname">Loren</p>
</body>
</html>
There are three things wrong here:
You are trying to access the element before it exists You cannot eat the pizza before it is delivered... See Why does jQuery or a DOM method such as getElementById not find the element? for more info.
<p> HTML elements do not have a value attribute. In your case, value is a non-standard HTML attribute. If you want to use custom attributes, use data-* attributes instead.
p DOM elements do not have a value property. Only form control elements (input, select, etc) have such a property. If you want to get the content of an element, use innerHTML or textContent instead.
If you had opened your browser's console, you would have seen an error, because the element with ID vname couldn't be found. Make yourself familiar with your browser's developer tools so that you can fix issues like this on your own.
You can't get the "value" of a p element, you have to get the "innerHTML"
try this: var name = document.getElementById("vname").innerHTML;
Try var name = document.getElementById("vname").innerHTML;
When you try to access the #vname is not in the DOM yet. You will need to add the script tag after the element or wait for the DOM to be loaded.
When that is said a <p> tag cannot have a value. Use data-value instead:
<p id="vname" data-value="firstname">Loren</p>
<script>
var vname = document.getElementById("vname");
var value = vname.getAttribute('data-value');
console.log(value);
</script>
Function objective()
{
Document.getelementbyid("pre").innerhtml=""
}
And in the HTML for my li in nave, I declared the onclick function but it is not working.
Note:- I am clear about case sensitivity in js and using bootstrap3
for resposive.
Use document.getElementsByTagName instead. This will return an array of all the elements that have that tag name.
Due to it returning an array, you need to make sure you use [0] to find the first index in the array.
function objective(){
document.getElementsByTagName("pre")[0].innerHTML="";
}
objective();
<pre>This is some content that will not show in the snippet</pre>
<div>This content will though</div>
getelementbyid() expect a id, not a tag name,your code will call on html like
<pre id="pre">
</pre>
if you want to select elementnot by id but form tag name use document.querySelectorAll("pre")[0] or document.querySelector("pre")
remember querySelectorAll return an array!!
getElementById selects an element with defined id as in your case pre as an id.
You must have an id attached to your element same that of argument in getElementById().
Or, you can use getElementsByTagName which selects element given in argument.
With span and div this works
jQuery
$('#exchange_rate1').html(data[0].FinalCurrencyRate);
HTML
<span id="exchange_rate1"></span>
But if the HTML is an input element such as <input type='text' name='exchange_rate1' id='exchange_rate1' value='<?php echo $post_exchange_rate; ?>> then nothing happens.
Removed php code from value the same nothing.
I also tried document.getElementById("exchange_rate1").html(data[0].FinalCurrencyRate); but I also see nothing.
Now clear, that need to use val. I just searched google for how to insert jquery variable in input field. Could not find.
Use jQueryObject.val(some_value) to set the value of an input, not html().
To be more specific:
// store the value you're looking to assign
var data = [
{ FinalCurrencyRate: <?= $post_echange_rate; ?> }
];
the jQuery way:
$('#exchange_rate1') // grab the <input>
.val(data[0].FinalCurrencyRate); // and assign it from the variable
the straight js way:
// normal JS version:
document.getElementById('exchange_rate1') // grab the <input>
.value = data[0].FinalCurrencyRate; // assign it
Any kind of form fields (<input>,<select>,<textarea>) use .val() to get/set since they don't contain child elements. .html() should be used for structural elements.
In case of text use as
$("#exchange_rate1").val('Hello');
This is because you aren't supposed to be setting the innerHTML of the input element, but the value.
In jQuery you use the .val() method:
$('#exchange_rate1').val(data[0].FinalCurrencyRate);
Or with plain JavaScript, you're changing the value property of the HTMLInputElement object:
document.getElementById('exchange_rate1').value = data[0].FinalCurrencyRate;
For textual input boxes, use .val(), for textareas, use .text(), and for non-input type elements, use .html().
All you need is
$("#exchange_rate1").val('Hello');
How to get element id using alias attribute in Mootools
<input type="text" alias="school_name" value="" id="test_school" name="test_school">
You can use the $$ function to return an element based on a css selector. You can use the css attribute selector syntax to retrieve elements based on an attribute.
// Returns all inputs with an alias of school_name
var els = $$('input[alias=school_name]');
This will return an array of elements.
You can then do els[0].id to retrieve the id of the first element (or loop through the elements as you see fit)
is it possible to "override/overwrite" an input element fixed value using javascript and/or jquery?
i.e. if i have an input element like this:
<div id="myDiv">
<input type="text" name="inputs" value="someValue" />
</div>
is it possible to make a jquery object of that element and then change its value to something else then rewrite the jquery object to the dom??
I'm trying but obviously I haven't got good results!
I've been trying something like this:
$('input').val("someOtherDynamicValue");
var x = $('input');
$("#myDiv").html(x);
If you just want to manipulate the value of the input element, use the first line of your code. However it will change the value of every input element on the page, so be more specific using the name or the id of the element.
$('input[name=inputs]').val("someOtherDynamicValue");
Or if the element had an id
$('#someId').val('some Value');
Check out jQuery's selectors (http://api.jquery.com/category/selectors/) to see how to get whatever element you need to manipulate with jQuery.
You can directly access the value via the $.val() method:
$("[name='inputs']").val("Foo"); // sets value to foo
Without needing to re-insert it into the DOM. Note the specificity of my selector [name='inputs'] which is necessary to modify only one input element on the page. If you use your selector input, it will modify all input elements on the page.
Online Demo: http://jsbin.com/imuzo3/edit
//Changes on the load of form
$(document).ready(function(){
$('#yourTxtBoxID').val('newvalue');
});
//Changes on clicking a button
$(document).ready(function(){
$('#somebuttonID').click(function(){
$('#yourTxtBoxID').val('newvalue');
});
});