angular.js: select textearea's content upon modification - javascript

I want to know if it's possible to select a textarea's content when it gets modified. In jQuery, I'd do the following:
$("texarea").on("change", function (e) {
$(this).select(); // the content gets selected for copy/cut operations
});
I know it's a bad practice to directly manipulate DOM elements from within an angular controller, so if you know how I can do this cleanly, I'd be happy to learn how!

I think you can do the following, attach an event handler to your textfield element using onblur and onfocus attributes. Write two functions for each as follows:
onfocus get the initial content of the textfield
onblur get the final content and compare to the initial content if there is a difference the run the select function
If you want it to be in real time your could also use onkeyup and onkeydown

Related

jQuery .val() doesn´t make a 'change'

I have problems testing my JavaScript. A part of my test looks like
$('#activityType').val("33");
$('#favorite').click();
The $('#activityType') is a select field and I want to select the option with value "33". Now I expected, that this would be a change, so that my function in my program like
$('body').on('change', '.item-select', function() {
var itemRow = $(this).parent().parent();
changeBookableItemInputFields(itemRow);
});
will be executed.
The $('#activityType') has got the class-attribute item-select, so I don´t understand, why $('#activityType').val("33"); is no change. I changed the value and the css-attribute is there. The body should be able to find it and the function should be executed.
Can anybody tell me, why it doesn´t work?
Changing a value with JavaScript does not trigger the events, you need to manually fire it. jQuery makes that easy with .trigger(eventName)
$('#activityType').val("33").trigger("change");
Use trigger() for calling any event using program.
change event is for user types into the input.
You can manually call the any event event using after setting the value:
$('#activityType').trigger("change");

jQuery global focus hook

In my focus manager I need to store some info on the last focus and blur. I need to delegate this hook to body, but if I use * as a filter I will receive the focus event for every parent item of the actual thing getting focus.
Realistically, I could make a filter to accept something like a, input, button ... etc, but also I need to refine it to a:not([tabindex]=-1), *[tabindex!=-1] etc.
But this gets complicated when one considers disabled controls. Is there a jQuery selector for :focusable, or how do I work around this? I could debounce my function, but even that is iffy.
EDIT:
Alright, my bad, I think what I am looking for here is :tabbable.
you can check focus by using: $("yourselector").is( ":focus" )
If you want to stop bubbling up to the dom just return false in your function after doing your stuff.enter code here

How to initialize form additions for jquery methods?

I've got a form where I'm trying to do the sort of thing you often see with tags: there's a textfield for the first tag, and, if you put something into it, a new and similar textfield appears to receive another tag. And so on. I've gotten the basics of this working by setting up a jQuery .blur() handler for the textfield: after the value is entered and the user leaves the field, the handler runs and inserts the new field into the form. The handler is pretty vanilla, something like:
$('input.the_field_class').blur(function () { ... });
where .the_field_class identifies the input field(s) that collect the values.
My problem is that, while the new textfield is happily added to the form after the user enters the first value, the blur handler doesn't fire when the user enters something into the newly-added field and then leaves it. The first field continues to work properly, but the second one never works. FWIW, I've watched for and avoided any id and name clashes between the initial and added fields. I had thought that jQuery would pick up the added textfield, which has the same class markings as the first one, and handle it like the original one, but maybe I'm wrong -- do I need to poke the page or some part of it with some sort of jQuery initialization thing? Thanks!
Without seeing your code in more of its context, it's hard to know for sure, but my best guess is that you're attaching a handler to the first field, but there is no code that gets called to attach it to the new field. If that's the case, you have a few options, two of which are:
1) In your blur() handler, include code to attach the blur handler to the newly created field.
2) Use jQuery's event delegation to attach a handler to the field container, and listen for blur events on any field in the container:
<div class="tag-container">
<input class="the_field_class" /> <!-- initial tag field -->
</div>
<script>
var $tagContainer = $('.tag-container');
var createNewField = function() {
$tagContainer.append($('<input class="the_field_class" />');
};
$tagContainer.on('blur', 'input.the_field_class', createNewField());
</script>
Which is better will depend on your use case, but I'd guess that the 2nd option will be better for you, since you're unlikely to be dealing with tons of blur events coming from the container.

Trigger procedure on textarea attribute value changes

I want to call user defined function, once <textarea> attribute values changes.
Attributes like height, width and val() of <textarea> i.e. on content change.
Your suggestion are welcome!!!
Regards,
-Pravin
What you likely want is the change and keyup and paste events, like this:
$("textarea").bind("change keyup paste", function() {
//this executes when the value changes
});
Textareas support a change event which fires when the focus leaves the element after the content has changed as well as keyup/down/press events.
You can't reliably detect a change that is triggered by JavaScript, so call whatever functions you would call on change in whatever function makes the change.
http://jsfiddle.net/qhysQ/1
This changes on keyup, if you wish to perform a function when the textarea loses focus, change 'keyup' to 'change.'

JQuery: Finding the Object that created a DOM Element

So I've been working on this all day and I can't figure out how to get it to work. I have a table with TD's filled with content which is drawn from a database using a JQuery "getJSON" command. I have an event handler set-up so that when you double click a TD element, its contents become a INPUT element with the default value of the enclosing TD's previous contents.
The INPUT element is created inside a Javascript object named "Input" like so:
var Input = function() {
var obj = this;
obj.docElement = $('<input/>').attr('type', 'text').val(obj.defaultValue);
}
All of this is working so far. My problem is, I want the user to be able to hit the RETURN key while the INPUT is selected to signify they've finished editing that field. I've tried something like the following:
$(obj.docElement).bind('keydown', function(e) {
if(e.which == 13) {
// do something
}
}
This works fine for the first time you edit a field; however, if you edit a field multiple times it stops working. Also if you randomly double click TD's eventually it breaks. I tested it and determined that the INPUT element stops registering any type event, as if the "bind" no longer existed on it.
I've done lots of googling and determined that the regular JQuery "bind" handler placed on an INPUT element is unreliable. Therefore I decided to attach the event handler to the document object instead using the following:
$(document).bind('keydown', function(e) {
// do something
}
I know I can use "e.target" to get the target element that the action is executed on (and this works for me, e.target correctly refers to the INPUT element).
My question is, how do I get the object that created the INPUT element in the first place? I need to be able to execute functions contained within the corresponding "Input"
class that was used to create the INPUT element. I need to call these functions from within the "$(document).bind" function. So basically I need to be able to get an INPUT element's parent/creator Input object.
If I haven't explained anything clearly enough, just let me know. Any help in this matter would be greatly appreciated! I'm also open to suggestions for alternative methods (other than using "$(document).bind").
Thanks!
I think I understand the problem ...
You can traverse the DOM to find the parent document element, but that's not what you mean, right? You want the parent script element that has a bunch of logic that operates on the element.
I suspect that it is probably easiest to provide some sort of reference to the parent when the input element is created ... pass this to the event handler, or set it in a globally accessible location (like a current_element_parent var).
I agree with tobyhede. You can either add a custom attribute to the INPUT element that refers back to the parent, or keep a map in memory that maps the dynamically created INPUT element to the parent that created it. When you trap the Return key, simply remove the relationship from the map so it can be added again if the user clicks it again.

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