I am using ASP.NET.
I am not sure what you will call this but I would like text to be displayed in my text box called txtName. So when the form load the text box will have faded text that will say "Required". Then when the user click inside the text box i want the user to place a value inside the text box.
Is this possible in ASP.NET? If so, how can this be done????
If you can use the MS AjaxControlToolkit, there is a watermark extender that will do precisely that.
MS Ajax TextBoxWatermark Extender
If not, you can probably find a jQuery plugin or roll your own javascript. Using server-side events will probably not do what you want.
onClick is a client side event. onFocus may be better. You can use
txtName.Attributes.Add("onFocus", "this.value = '';this.style.color = 'black';")
Put it in the Page's PreRender event.
Here's a great jQuery plug-in:
http://www.mudaimemo.com/p/formnotifier/
Try something like this:
<asp:TextBox ID="txtName" runat="server"
onclick="if (this.value == 'Required') {this.value=''}"
Width="275px">Required</asp:TextBox>
If using the Ajax Toolkit is an option or makes sense there is a tool in the tool box called textbox watermark (see http://www.asp.net/AJAX/AjaxControlToolkit/Samples/TextBoxWatermark/TextBoxWatermark.aspx)
Related
I have a TextBox and and I want to open a Popup on clicking TextBox. There is no Click event for TextBox. I want to do it in C# completely. I don't need jquery in opening Popup on Click of TextBox.
Asp.net textbox:
<asp:textbox onclick="myJavaScriptFunction()" runat="server" id="myTextBox" ... >
#edit
jquery example:
$("#target").click(function() {
alert("Handler for .click() called.");
});
The nature of creating a website solution like you are doing makes this impossible. In ASP.NET WebForms and MVC you do not deliver C# code to the user so you cannot create client side behavior with C#; instead, you deliver an HTML page and assets like files for Javascript, CSS, images, etc. If you want to invoke client side behavior, you need code that will run client side. That means using Javascript, and I recommend that you use jQuery while doing that.
nirmus's answer will give you an example for that, but to answer your question completely bluntly the answer is: "You can't."
I have this in the
<asp:TextBox ID="svv" OnClick="this.value=''" runat="server">Hello...</asp:TextBox>
OnClick="this.value=''" // On mouse click in textbox it will deleted the text.
How can I set something like
Unclick"this.defautlvalue"; // something like this.
So, when I click the control it will clear the value, if I exit from the control (for example, clicking another textbox) it will return the default value of the textbox.
Thanks
Specifically with C# .NET WebForms you have a few options.
You can go completely front-end with jquery by doing something like this:
$('selector').blur(function() {
// Make sure you do some validation so it doesn't clear everytime
$('selector').val('My Default Text');
});
Or, if you are using the AJAX Control Toolkit, you can simply use The textbox Watermark Control, which will do exactly what you are talking about just by setting a few properties.
You can also go straight javascript like #m.edmondson explain in his answer.
I think you're looking for onBlur:
<input type="text" id="fname" onblur="upperCase()">
This will call upperCase() when the user leaves the box.
You can attach to the client-side onblur event which is called when the focus of your control changes.
Also worth storing the default value in an attribute on the input so you can refer to it in blur event. Believe in ASP.NET web forms you've got to add that attribute in the code-behind though.
I have a form in asp.net webpage which contains 2 drop down lists and a hyperlink + a button.
I want that if user changes an option is dropdowns to change navigate url.
I have done like so:
<asp:DropDownList ID="ddlPackages" AutoPostBack ="true" runat="server"
onselectedindexchanged="ddlPackages_SelectedIndexChanged"></asp:DropDownList>
and then I have the method defined.
The point is that I don't want to make a submit when I change the drop down. Can I do it using only aspx or I have to use javascript?
If I understand you correctly you want to change the href of the hyperlink based on the selected value of the dropdown. You can do this with javascript. Make sure you have AutoPostBack="false" and remove the OnSelectedIndexChanged attribute as well.
To do it using jQuery, use something like this:
<script type="text/javascript>
$(function(){
var $dropdown = $('#<%= ddlPackages.ClientId %>');
$dropdown.change(function(){
//Put logic to decide the link here based on the select value
var newPage = 'page' + $dropdown.val() + '.aspx';
$('#linkId').attr('href', newPage);
});
});
</script>
Edit:
In case you absolutely must have the logic for getting the new url based on the drop down value on the server side, you can turn the method into a Page Method and call it using ajax from the jQuery script above. But you can probably get away with creating the javascript dynamically in the aspx page instead.
I see two options:
1) Wrap the controls in an Update Panel (.NET 3+). Put AutoPostBack=true on the dropdownlist, and define a SelectedIndexChange event for it that changes the hyperlink control's Navigate URL property. When the user changes the dropdown, you're method will fire without the APPEARANCE of a form submission. Downside: there's a slight delay between the dropdown changing and the link changing. If your server is really, really slow, this delay could potentially cause problems (but this is probably unlikely).
2) Use custom JavaScript and do away with your .NET controls completely. This is what I would probably do, assuming you don't need to do anything else with these controls programatically. Your JavaScript function would monitor the dropdown for a SelectedINdexChange and adjust the href attribute of the anchor tag accordingly. Look into jQuery to speed up development if you aren't too familiar with plain JavaScript.
If the control is an ASP:DropDownList, you can use the AutoPostBack="True|False" property to prevent a postback
If you don't want to use the AutoPostBack you have to post the form using jQuery or Javascript
You can add an event on your drop down list onchange and add the code you need to post the form usin jQuery:
$('#formId').submit();
http://api.jquery.com/submit/
If you to want navigate to another Url add the below code at your DropDownList control (make sure AutoPostBack=false)
onchange="window.location.href='yourUrl'"
it would be better put that Javascript on a separate file anyway
Wondering if there is a way upon clicking on a hyper link to set drop downlist to visible in code behind or asp?
<asp:HyperLink ID="HyperLink2" runat="server">View More Workout Programs ยป</asp:HyperLink>
If you have to do it in code-behind, then use a LinkButton instead of a HyperLink. Then it will have a click event just like any button and in that click event you can set the other element to .Visible=true.
However, does this need to be done in code-behind? Keep in mind the difference in "visibility" between server-side and client-side code:
If set to .Visible=false on the server-side, the content is not delivered to the client at all.
If set to display:none on the client-side, the content is present and can be viewed in the page source, it's just not displayed by the browser.
In some cases, the former is needed for security purposes. But if it's just a matter of user experience then I would recommend showing/hiding the content entirely on the client-side so as to avoid post-backs that do nothing more than change element display properties.
For example (assuming jQuery):
<a id="toggler" href="#">Show the content</a>
<div id="hidden" style="display:none;">Content</div>
<script>
$(document).ready(function(){
$("#toggler").click(function(){
$("#hidden").show();
});
});
</script>
Use an asp:LinkButton instead of a hyperlink and handle the OnClick event. In the OnClick event, toggle myDropDownList.Visible depending on whether you want to show it or not.
You should implement that kind of feature in the client (javascript code) to improve user experience.
Anyway, you can use a Panel with Visibility=false and put Visibility=true in code behind when link is clicked. You would need to adjust the position of that panel with css to look like a dropdown.
You can try with JQuery : http://www.jquery.com
It will be something like
<script type="text/javascript">
$(document).ready(function(){
$("#<% =HyperLink2.ClientID %>").click(function() {
$("#<% =DropDownList1.ClientID %>").toggle();
});
});
</script>
If you need to send form back to the server, use asp:LinkButton instead and handle OnClick event on the server side. If you need to show drop down list on the client side, use javascript function with onclick client event to show or hide any section you want.
I got this Text box with default value as "First Name" ..Now when I click inside this text box to enter name , this value "First Name" keeps on displaying. What I want is to the text box to clear as soon as I click inside it. What property do I need to set in mt textbox tag ?
[Edit]
ok anything from Telerik that I can use to do that ?
There is not out of the box functionality in TextBox that will accomplish this, but the ASP.Net Ajax Toolkit has a Watermark Extender that will do everything you want.
I have used both, but now personally use a jQuery Watermark Plugin
Either will work just fine, choose based on your needs.
According to the Telerik docs you just have to set the EmptyMessage property on their TextBox control. Demo Page Here
In the code behind, on Page Load you can add the following code to achieve this
TextBox1.Attributes.Add("onClick", "javascript:if(this.value=='First Name'){this.value='';}");
You can use the method suggested by #Josh. If you do not want to use Ajax Toolkit controls or JQuery you could write it on your own using Javascript. Write a function which gets called when the foucs is received by the textbox control. I thik the function is called onfocus or just focus in Javascript.
Hi I just wrote this small function which will achieve your desired result
function clearInputBox(x,prefil){
if(x.value == prefil){
x.value = '';
}
}
Your input box looks like this
<input type='text' value='First Name' onfocus="clearInputBox(this,'First Name')" />
May be this will help you
Taking Shobans advice one step farther, you could add something like this to your Page subclass
protected override void OnInitComplete(EventArgs e)
{
string jsString = "javascript:if(this.value=='" + TextBox1.Text + "'){this.value='';}";
TextBox1.Attributes.Add("onFocus", jsString);
base.OnInitComplete(e);
}
What this will do is, it will always consider that default string is the one this controll contains at esign time (the initial one in your .aspx file), so you wont have to manually change it in codebehind every time you change your .aspx. Remember, that OnIinitComplete fires before any viewstate or postback data has been applied, but after the controlls on your page have been set to their default values.
P.S. As anishMarokey pointed, use onFocus vs onClick, since fields can gain focus without clicks via Tab key.