Is it possible to set a new attribute to the last position of a html element using javascript/jQuery?
This would be helpfull for me in a case where the attribute order is important to decide whether the paragraph has changed or not.
Example:
<p attribute1="true" attribute2="true">
Now, i would like to add a third attribute so that the resulting paragraph would look like
<p attribute1="true" attribute2="true" attribute3="true">
No, it's not possible. Attributes are unordered in HTML and XHTML markup languages, so browsers are free to return them in whatever order they like, e.g. alphabetic, specified, etc.
You should rethink your approach, for instance using the .data() method to track changes:
$("#el").data("changeHistory", []);
// ...
$("#el").data("changeHistory").push(new Date().toString());
Optimally you should never be in a position where you need to read attributes in order (by index).
If you have an element like so <div id="container">, you can add an attribute using jQuery like so $('#container').attr('disabled', true);. Keep in mind this should add the attribute to the end of the element.
Another tip is if you are looking to modify a DOM element attribute such as style, consider looking at the jQuery API to see what methods are avialable before writing anything too crude. For example, if you wanted to add a style you could simply do $('#container').addClass('hover');
Related
I am looking for a way to apply new CSS to only part of the element.
For example. The original HTML looks like
<p>123456</p>
I want to make only 456 into bold.
Of course, I can do it by adding another tag into 456 like
<p>123<b>456</b></p>
But in my application, I do want not to change the original DOM structure. By adding a new tag, I changed the DOM structure.
To do that, I am thinking of adding new custom attribute to the existing tag like
<p data-wms="e-3">123456</p>
Here data-wms means that there are special part and e-3 means that from index 3 character (it is 4 here) to the end will have a special attribute (like bold in this example)
Now I have all the information about where to change inside the element.
But still, how can I do that with javascript without adding a tag, without changing dom.
Thanks
You can use the span element to do so, it's made specifically to handle inline styling while mantaining the overall structure.
An example would be:
<p>123<span class="bold-highlight">456</span></p>
Thanks to everyone's advice, I researched more, especially about nth-letter.
Though nth-letter is exactly what I want, I found that it is still just proposal, not implemented in any browser.
Thus, there is no way to applying different css letter by letter in one text element without embracing each letter with span tag at this moment (2021-March). I hope that there will be nth-letter in the near future.
I think that I have to re-design my project...
if it's a static page and you want to change a style for specific text in a specific tag like the following case
<p>11111</p>
<p>22222</p>
<p>33333</p>
<p>44444</p>
let's say you want just style the third element, you can change it by the following code using jQuery for sure you can use JavaScript but jQuery will help you to make your code shorter
$( "p:nth-child(3)" ).css("color","#f00");
Is it possible to set the value of a data-* attribute based on the text of the HTML element? Schematically, this is what I have in mind:
<div data-text={this.text}>example</div>
resulting in data-text="example".
I think it may be possible if you set an id and then get the element by that, like this:
<div id="exampleId" data-text={document.getElementById("exampleId").textContent}>example</div>
But this is not what I'm hoping for because it requires setting an id ahead of time (so may as well just set the data attribute ahead of time). What I'm aiming for avoids the need to set anything specific to the element ahead of time and uses a property of the element itself to set that.
Maybe this isn't even a well defined question! But figured I'd ask. Thanks in advance :)
You could use querySelectorAll and apply logic to each element that has a data-text attribute like this:
const elements = document.querySelectorAll("[data-text]")
elements.forEach(element => {
element.setAttribute("data-text", element.innerText)
})
I have a modal form that is generated using bootstrap 3. It doesn't look like there is a reliable way to determine when that form is being shown onscreen. I am attempting to create one. I attached two events to my DOM element that signal when it is shown and when it is hidden.
jq_modal_login_form = $('#modal-login-form')[0]
jq_modal_login_form.on('shown.bs.modal', function () {
jq_modal_login_form.active_onscreen = true;
});
jq_modal_login_form.on('hidden.bs.modal', function () {
jq_modal_login_form.active_onscreen = false;
});
I tried to give an attribute named active_onscreen to the DOM element above. When I look at the DOM element in the debugger later, the attribute is not present.
I should mention that I am VERY new to javascript. Is attribute even the right word to use here? It looks like attribute is a bit of a misnomer as well. It could be an attribute of the object but could also be an attribute of the object.attributes attribute, right? I assume the later is where styling ect., goes and is not what I want to change. Does anyone have some insight as to what I should be doing here?
In jQuery:
$('selector').attr('attribute_name', 'value');
However, you can should only use predefined attributes as creating custom attributes requires additional setup (see this question) that is not necessary in your case.
In your case, you may just want to add a active_onscreen class to the element. Classes are meant to be used to identify elements (and not just for CSS), so they are perfect for this applicaiton. You would use this to add a class to an element:
$('selector').addClass('active_onscreen').
When it is no longer active, you would use this to remove the class:
$('selector').removeClass('active_onscreen').
What you are doing here is adding a property of the DOM object - not an attribute of the element.
Adding an attribute does not necessarily make the property mirror it. Only built-in properties do this.
If you want to set an attribute, but not the property, you can use jQuery's .attr() method.
If you just want to see if a given modal is open, Bootstrap does that for you. You can check the bs.modal data attribute:
$("element").data('bs.modal').isShown;
or a class (but this method is prone to race conditions):
$('#myModal').hasClass('in');
Dojo converts several "ordinary" input elements into a more complex node structure. For example, a Dojo dijit/form/Select results in a widget composed of a table instead of a <select> element. dojox.form.Uploader converts into something where the id is mapped to a span and not to a <input id="myId" type="file" element. etc etc.
For accessibility, I need to map a label to an input widget, and running my website through Wave generates a lot of red flags because label for values do not match an input id.
What's the best way round this issue?
You can set an id property on most widgets, which should be put on the inner <input> node that you desire. Take a look at this fiddle for an example. If you open up your HTML inspector for the TextBox widget, you will see that the outer node has an id of "widget_[my id]" and a widgetid of the id you passed to the widget. Digging into the contents of that outer div, you will see that the actual <input> element indeed has the desired id that I passed in.
However, it seems that for more complex widgets that use a hidden <input> to store the value, you have to explicitly set the id of the valueNode property. You can see an example in this fiddle.
So you can create your widget like programmatically like this:
var select = new Select({
... widget properties
});
select.valueNode.id = "my_id"; // probably best to use dom-attr to set this.
If your widget is created declaratively, then you will need to get access to it via the registry, an attach point, or dijit#byId.
First post on stackoverflow. Hope everything is right!
I'm thinking of attaching an ID value to the HTML element itself via JavaScript, instead of using the HTML id attribute.
For instance, say that JavaScript variable htmlElement is a div. So htmlElement.cssName would tell us its CSS class.
Now, how about doing
htmlElement.idProperty = "someValue"
in JavaScript instead of doing <div id="someValue">? Then I can use the idProperty in say event handlers.
this.idProperty
That simple!
Is there something wrong in doing so?
EDIT: Thanks for yor answers! Very helpful and instructive. I wish I could check green on all of them!
no, you can do it the way you like it, if you are dynamically creating this item you should use this method, if you are doing this inside html I recommend you to just put the name of the id in html too.
However a small note. Use element.id instead of idProperty.
element.id = 'my-id';
You can use the createAttribute method to add an id to the element like this:
id = document.createAttribute('id');
id.value = "someValue";
htmlElement.setAttributeNode(id);
What you're doing there is adding a runtime property (in your case, called idProperty) to an HTMLElement object instance. You can get away with doing that in your JavaScript code (the Prototype library does it all the time). Makes me uncomfortable, but it does work on all major browsers.
If you want to be able to specify these in HTML markup as well, though, I'd use attributes instead. You can create attributes with any names you want, although to be careful I'd use names like data-xyz (e.g., use a data- prefix) as that's the HTML5 standard way of using your own attributes. Then you use getAttribute to get the value and setAttribute to set/update the value.