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I am not advanced in the Javascript realm, and can't figure out how to write the code to do this.
Basically, I'll use a URL parameter to run this function (&testing) - but I'd like to take the ID of an input field and display it next to that input. I frequently use these ID's for CSS etc, and it would be great to have them auto-display next to a field rather than having to inspect every element individually.
Any help?
It's a little trickier than it sounds. If you don't want to mess with the IDs, you'll have to
document.getElementsByTagName("input");
Which creates a NodeList of the input elements. Then, loop through with a simple for loop, or go fancy with a prototype call.
Array.prototype.forEach.call(document.getElementsByTagName("input"), function(x) {
var span = document.createElement("span");
span.textContent = x.id;
x.parentNode.appendChild(x);
});
This is a fancy script that creates a span, and assigns the text to the id of the element it's iterating over. It then appends said span after the input by grabbing the parent and appendChilding it.
This assumes your inputs do not share the same parent, so you may have to adjust for your HTML structure, but the key is to iterate, assign text, and append the new element.
var inputs = document.getElementsByTagName('input');
for(var i =0; i<inputs.length; i++){
inputs[i].title = inputs[i].id;
}
Finds all the html input elements on a page, and adds a tooltip with its id value on mouse over.
Dev tools can do this for you though without causing as much fuss!
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I am using $html attrib for inserting data attrib to my index.html file using jquery. I have also typed attribs manually.
Now is it possible if I press f12 to see the $html attribs first before the manual attribs?
E.g
html data-id="Code" lang="en-PH"
i set lang attrib manually and data id code via jquery.
If I press f12 lang comes first before data id. I want data id first before lang.
Is it possible?
It's possible, by iterating over all attributes that exist on the element and deleting them, then adding your own new attribute, then re-adding the originals...
const div = $('div')[0];
// Cache and remove existing attributes
const attribs = [];
for (const attrib of div.attributes) {
attribs.push([attrib.name, attrib.value]);
div.removeAttribute(attrib.name);
}
// Add your own
$(div).attr('dynamicAttrib', 'dynamicVal');
// Re-add original attibutes
for (const [name, value] of attribs) {
$(div).attr(name, value);
}
console.log(div.outerHTML);
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div firstAttrib="firstValue"></div>
But whether a piece of code works or not should not depend on attribute order. It's somewhat convoluted and doesn't accomplish anything, and could even cause problems; I'd recommend not bothering.
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I am trying to find the appropriate way to edit an element but it seems like their is only one node with an ID. I have thought of
my code looks like:
var root=document.getElementById("app-mount").childNodes;;
var child = root[n].innerHTML;
But this is not reusable to get the path to any element such as $0 used in chrome dev tools. I was wondering if there was a method one could call on $0 to just give me the path so one could know how to target it as one does for an ID document.getElementById('id');
Edit:
after getting help I have updated my code to look like:
document.querySelectorAll('svg')[1].outerHTML="<img id='orb' class='orb' src='https://i.imgur.com/k3d8qMN.gif' width='50' height='60'>"
Its for a theme I am making for discord!
Thanks for the help!
I am not sure that I am following your question very well, but if I understand you correctly, you are looking for something like querySelector or querySelectorAll.
You can use CSS commands to target various HTML elements. eg:
document.querySelector('div'); //returns the first div
document.body.querySelectorAll('div'); //returns all the divs attached to the body element
You can also target ids:
document.querySelector('#app-mount');
or classes:
document.querySelector('.blue');
and query selectors may also be used:
document.querySelector('#app-mount > ul > li:nth-child(3)');
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Hello there am trying to make an image gallery for example lets say that I have multiple images and I want to change their opacity when I hover over them by using JavaScript I know that this is possible with CSS but am trying to accomplish this with JavaScript I tried using get Elements By Tag Name method but the problem it just can access one element by time so can I do that thanks
Try this:
var elements = document.getElementsByTagName("img");
Array.prototype.forEach.call(elements, function (e) {
// Here you can access each image individually as 'e'.
});
When you hover, get the ID of that image. Then loop through all images (example above) and set their opacity. If the element is equal to the one you clicked on (remember, you just took the ID so you can use it), just skip to the next one using continue;.
you have to collect you image elements like
var images = document.getElementsByTagName("img");
then you have to do like
Array.prototype.forEach.call(images, e => e.addEventListener("mouseover", function( event ) { do something}));
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I'm a javascript newbie so go easy on me. I'm wanting to select a bunch of text that is identifiable only by inline CSS (not classes or ids or anything), and create a toggle that turns it on and off. So -- find everything with backgroundColor = '#eed6b4' and toggle display='none' / 'inline-block'
Needing the javascript and html... thx
=====================
This is what I tried originally:
<script type="text/javascript">
function toggleVisibility() {
var codeNum = document.getElementsByClassName('syntaxHighlightingPlugin');
i = codeNum.length;
while(i--) {
codeNum[1].style.backgroundColor = '#eed6b4';
if(codeNum.style.display == 'inline-block')
codeNum.style.display = 'none';
else
codeNum.style.display = 'inline-block';
}
}
</script>
<button type="button" onclick="toggleVisibility();"> Hide numbers (for copying) </button>
Oh, and as I replied to a comment, the twist on this is that it's for text rendered by a TWiki plugin, so I have no control over the resulting CSS --- which, as I said, has no classes --- also, since it's rendered, I think I may need to use something like getComputedStyle (?).
It's generally bad practice to use inline css, and to make your Javascript dependant on that inline CSS is also not a good idea. However, if you wanted to select an element based on the value of an attribute, you can use the attribute value selector like this:
$("[style='backgroundColor *= #eed6b4']").hide();
Reminder: This uses jQuery.
You could set a class to that background color and then filter by class name $(".classname").
OR
You could add a new selector like explained here:
Is there a style selector in jQuery?
Not necessarily a great idea, but you could add a new Sizzle selector for it:
$.expr[':'].width = function(elem, pos, match) {
return $(elem).width() == parseInt(match[3]);
}
which you could then use like so:
$('div:width(970)')
//That's going to be horrifically slow, though, so you'd want to narrow down on the number >of elements you're comparing with something like :
$('#navbar>div:width(970)')
//to only select those divs that are direct descendants of the navbar, which also have a >width of 970px.
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Is the if statement saying if placeholder is not in document.create(input)? Why is it using document.create.
<input type="text" placeholder="john Doe">
<input type="email">
<script>
if( !'placeholder' in document.createElement('input'){
// do something
}
</script>
It's seems to be trying to perform feature detection to determine support for placeholder properties on <input> elements, which are new with HTML5.
The document.createElement('input') is used to create an unmodified <input> element for the test. And the in operator tests for the presence of a property on that DOM element.
Though, it doesn't quite achieve what it seems to be trying. The ! will act before the in, so this ends up testing whether such elements have false properties, which they don't.
It'll need another group of parenthesis to ensure that the in is evaluated first so ! can negate its result for the condition.
if (!('placeholder' in document.createElement('input'))) {
// `<input>` elements don't have `placeholder` properties
}
Note: It was also missing the closing ) for the if condition.
What your code would do, if it was syntactically correct, would be to check if the browser has native support for the placeholder attribute introduced with HTML5.
The if-statement create a new input element and then check if the newly created element has a placeholder-property. If it has, then the browser support the placeholder attribute.
A syntactically correct example would be:
if(!('placeholder' in document.createElement('input'))) {
// This browser lack native support for the
// placeholder attribute, do something
}
Example: http://jsfiddle.net/eAy3Y/
Try :
var input = document.createElement("input");
if(!('placeholder' in input)){
input.setAttribute("placeholder", "Your place holder");
}
document.createElement creates a new attribute node, and returns it.
Hope this helps you.