I have a form on a website, in which one of the inputs is to be used to enter hexadecimal colour codes to be entered into a database.
Is there any way for the page to dynamically update itself so that if the user changes the value from "000000" to "ffffff", the "colour" CSS property of the input box will change immediately, without a page reload?
Not without Javascript.
With Javascript, however...
<input type='text' name='color' id='color'>
And then:
var color = document.getElementById('color');
color.onchange = function() {
color.style.color = '#' + this.value;
}
If you are going to go the Javascript route, though, you might as well go all out and give them a color picker. There are plenty of good ones.
CSS properties have corresponding entries in the HTML DOM, which can be modified through Javascript.
This list is somewhat out of date, but it gives you some common CSS pieces and their corresponding DOM property names.
Granted, a JS lib like like jQuery makes this easier...
You can use Javascript to achieve that.
As an example:
Your HTML:
<input type="text" id="test" />
Your JS:
var test = document.getElementById('test');
test.onchange = function(){
test.style.color = this.value;
};
But this doesn't check the user's input (So you would have to extend it).
Related
Some browsers provide a hint to the user for an input field based on the type of the input, e.g. here for type="email":
<input accesskey="e" name="email" id="email" type="email" required>
Chrome:
Firefox:
My questions are:
Are these part of any spec?
Is there a way to control that message (the message itself and also disable/enable it)?
Is there a way to style this tooltip?
its browser behavior so its cant be modified but you can done something like the tool-tip or hint using bootstrap css framework
Hover over me
Hover
Hover
Hover
Hover
You can find examples here
This is the solution from Mozilla
var email = document.getElementById("mail");
email.addEventListener("input", function (event) {
if (email.validity.typeMismatch) {
email.setCustomValidity("I expect an e-mail, darling!");
} else {
email.setCustomValidity("");
}
});
To customize the appearance and text of these messages, you must use JavaScript, there is no way to do it using just HTML and CSS.
You can use something like this:
var email = document.getElementById("mail");
email.addEventListener("input", function (event) {
if (email.validity.typeMismatch) {
email.setCustomValidity("I expect an e-mail, pls!");
} else {
email.setCustomValidity("");
}
});
HTML5 introduced new mechanisms for forms: it added new semantic types for the element and constraint validation to ease the work of checking the form content on the client side.
Check this documentation
If you want to disable client side validation for a form in HTML5 add a novalidate attribute to the form element. Fx:
<form method="post" action="/foo" novalidate>...</form>
just give a title attribute and use your content to show , and there is no way to style it, to style it you need to include jquery library
<input type="text" title="this is how i did that" />
I am using select2 on dropdownlist of asp.net. The code is as follows:
<script type="text/javascript" src="js/select2.min.js"></script>
<link type="text/css" rel="Stylesheet" href="css/select2.css" />
var v = /* get the select control */
v.select2();
The problem is, once select2() function is called, tab ordering stops working. Therefore, when on the dropdownlist tab key is pressed, focus do not move to the control having next highest tabindex but move seemingly randomly to some other control.
Commenting the line where the function is called solve this problem but I need the filtering. I have tried some of the other techniques of filtering discussed here but they are too complicated. Select2 is very simple and useful because all you have to do is include the JS and CSS files and call the function.
How can I solve this ordering problem? Alternatively, is there another filtering option as easy to use as select2 that would help me?
After a few hours of struggle, I have solved the problem. It turns out that the select2 AJAX control do destroy the tab order if the tab is pressed as soon as it gets focus, that is, when nothing is typed in it. It does not, however, destroy tab ordering if some text is typed.
The internal structure of select2's auto-generated HTML is like following:
<div class="select2-container">
<a class="select2-choice">
<span</span>
<abbr class="select2-search-choice-close" />
<div> <b></b> </div>
</a>
<div class="select2-drop select2-offscreen">
<div class="select2-search">
<input class="select2-input select2-focused" tabIndex=<somevalue> />
</div>
<ul class="select2-results></ul>
</div>
</div>
If some text is typed in the HTML select control, then tab ordering is working correctly, if no text is typed then tab order is destroyed. I have used document.activeElement in firebug to find focused control in both cases. In case of no text the anchor element has focus, and in case of text typed the HTML input element has focus.
As shown above, while select2.js correctly set tabIndex property of HTML input element, it does not of the anchor element.
Solution
Just add the following line at the position specified further below in select2.js:
this.container.find("a.select2-choice").attr("tabIndex", this.opts.element.attr("tabIndex"));
Add the line after:
this.opts.element.data("select2", this).hide().after(this.container);
this.container.data("select2", this);
this.dropdown = this.container.find(".select2-drop");
this.dropdown.css(evaluate(opts.dropdownCss));
this.dropdown.addClass(evaluate(opts.dropdownCssClass));
this.dropdown.data("select2", this);
this.results = results = this.container.find(resultsSelector);
this.search = search = this.container.find("input.select2-input");
and before:
search.attr("tabIndex", this.opts.element.attr("tabIndex"));
this.resultsPage = 0;
this.context = null;
// initialize the container
this.initContainer();
this.initContainerWidth();
installFilteredMouseMove(this.results);
this.dropdown.delegate(resultsSelector, "mousemove-filtered", this.bind(this.highlightUnderEvent));
installDebouncedScroll(80, this.results);
this.dropdown.delegate(resultsSelector, "scroll-debounced", this.bind(this.loadMoreIfNeeded));
So it becomes:
this.results = results = this.container.find(resultsSelector);
this.search = search = this.container.find("input.select2-input");
this.container.find("a.select2-choice").attr("tabIndex", this.opts.element.attr("tabIndex")); /* atif */
search.attr("tabIndex", this.opts.element.attr("tabIndex"));
this.resultsPage = 0;
this.context = null;
Make this change in select2.js. Obviously, you need to use the full js version, not the min version.
All you have to do is add one line, stated above. This would become line no#504 in VS2008 if done correctly.
Using #Html.TextBoxFor(m => m.MyField) will (normally?) result in <input id="MyField" name="MyField" type="text" value="" /> and if I want to access that element in jquery I do so as follows $("#MyField"). Is there a way to avoid manually typing the ID into the jquery selector? It seems clunky to me to do it this way as I'm coming from a classic asp.net background where you would pull the id of the element using the ClientID property. Therefore if the renderer changed how it generated the ID ones code automatically kept up-to-date. In the above example if I change MyField to MyNewField the compiler will remind me to change all the strongly typed references, but nothing will remind me to change my jquery selector.
Write a simple method that get a property and return it's name with reflection and use it like this:
static string GetVariableName<T>(Expression<Func<T>> expression)
{
var body = expression.Body as MemberExpression;
return body.Member.Name;
}
$('#' + #(GetVariableName(() => Model.MyField)))
Should work.
I want to convert this code to JavaScript code:
rdb1 = (RadioButton)DataList1.Items[i].FindControl("rdb1");
How can it be done?
Put a unique class on the radio button and then you can easily use jQuery to walk the DOM and find that control.
Here is an example of finding a control here on Stack Overflow.
Here is a tutorial of How to Get Anything You Want from a web page via jQuery.
Good luck, and hope this helps.
In JavaScript using the id attribute makes it easy to retreive a specific element since the id must be unique for all tags.
var radio1= document.getElementById("rdb1"); //this returns the element
Here is a simple tutorial on how to do other things after getting the element.
EDIT- I see you just want the selected value in javascript:
function radiochanged(){
var radio1= document.getElementById("rdb1");
var rdb1_value;
for (i=0;i<radio1.length;i++)
{
if (radio1[i].checked)
{
rdb1_value = radio1[i].value;
}
}
}
<input id="rdb1" type="radio" onClick="radiochanged()">
The Javascript checkbox script (by ryanfait) worked beautifully when I used it at first. Then I needed to alter the form I made so that asp.net could process the form, but now the checkboxes are default.
Is there a way to alter the script to make it work on the asp:checkbox?
I call the function like so:
$(document).ready(function() {
$('input[type=checkbox]').checkbox();
});
And here is the actual javascript.
I have two different types of checkboxes on my page at the moment, one <asp:Checkbox ... /> and one <input type="checkbox" ... />. The second one gets styled, the asp checkbox doesn't...
I haven't contacted Ryan Fait yet, as I hoped this was a common "bug".
EDIT:
The way the script works is, it finds all elements with class="styled", hides it and then puts a span next to the element. Somehow in my sourcecode, for the asp:checkbox this happens too early I think. Look:
<input type="checkbox" class="styled" /><span class="styled"><input id="ctl00_contentPlaceHolderRightColumn_newsletter" type="checkbox" name="ctl00$contentPlaceHolderRightColumn$newsletter" /></span>
The span is there, visible and all, which it should not (I believe, as the first checkbox shows up in the style I want it to be, the second doesn't).
So far, I found a part of the problem. The javascript cannot change the asp checkbox somehow, but when I manually add the span the javascript is supposed to create, the checkbox doesn't work as a checkbox anymore. I added some details in my answer below.
Set an ID on your checkbox and then reference it by that ID, like so:
<asp:checkbox id="mycheck" />
Then reference it like this:
$('#mycheck').checkbox();
If that doesn't work, do what many, many web developers before you have done: download Firefox, install Firebug, and check your selector logic in the console. I find it's always easier to develop in Firefox, even when my target platform is IE.
I found part of the answer.
When I add the span the plugin creates manually like so:
<span class="checkbox" style="background-position: 0pt 0pt;"><asp:CheckBox ... /></span>
I do get the nicely looking checkbox UNDERNEATH the actual checkbox!
However, the styled box is not interactive. It doesn't change when I click it or hover over it nor does it register the click. It's basically not a checkbox anymore, just a goodlooking square. The actual asp checkbox that shows up does register clicks, but it's the ugly standard one.
<span class="checkbox" style="background-position: 0pt 0pt;"><asp:CheckBox ID="anId" runat="server" style="visibility: hidden;" /></span>
The visibility: hidden makes the "real" checkbox dissappear and leaves the goodlooking yet broken one.
Got it.
Forget about the RyanFait Solution, this one works on ALL checkboxes. :D
var boxes;
var imgCheck = 'Images/checkbox-aangevinkt.png';
var imgUncheck = 'Images/checkbox.png';
function replaceChecks(){
boxes = document.getElementsByTagName('input');
for(var i=0; i < boxes.length; i++) {
if(boxes[i].getAttribute('type') == 'checkbox') {
var img = document.createElement('img');
if(boxes[i].checked) {
img.src = imgCheck;
} else {
img.src = imgUncheck;
}
img.id = 'checkImage'+i;
img.onclick = new Function('checkChange('+i+')');
boxes[i].parentNode.insertBefore(img, boxes[i]);
boxes[i].style.display='none';
}
}
}
function checkChange(i) {
if(boxes[i].checked) {
boxes[i].checked = '';
document.getElementById('checkImage'+i).src=imgUncheck;
} else {
boxes[i].checked = 'checked';
document.getElementById('checkImage'+i).src=imgCheck;
}
}
I think that your problem could be caused by the fact that asp:CheckBox controls are automatically wrapped in a span tag by default, and setting the CssClass attribute on the asp:CheckBox control actually adds the class to the span (not the input) tag.
You can set the class on the input tag using the 'InputAttributes' as follows:
chkMyCheckbox.InputAttributes.Add("class","styled");
...
<asp:checkbox id="chkMyCheckbox" />
This should then allow you to target the checkbox with your existing JavaScript.
You don't need to use the 'type' attribute. Does the following work for you?
$(document).ready(function() {
$('input:checkbox').....etc
});