I have an <asp:CheckBox>, and I need to apply a JavaScript call upon it. The JavaScript function should set the visibilty of an <asp:Panel> to be true if the CheckBox is checked. The visibility of the panel should be false if the CheckBox is not checked.
I wasn't able to reach the JavaScript function using an <asp:CheckBox> with a normal input:type = checkbox it worked. But I need it to be an <asp:CheckBox>!
If i understand you correctly I would personally use jquery then you can do something like this
$("#yourCheckBoxId").change(function(){
if($(this).attr('checked')){
$(".yourDivClass").show();
}
});
Assuming that your CheckBox has a runat="server" attribute, you need to do something like:
$("<%= MyCheckBox.ClientID %>").change(function () {
$("<%= MyPanel.ClientID %>").toggle();
});
The code above assumes that your CheckBox and Panel will always have the same state. That is, a checked CheckBox equals a visible Panel. If you need to modify this code (change the conditions under which the Panel is visible, etc.), and want to reference the current checked state of your CheckBox, simply do this inside your change() function:
var checked = $(this).prop("checked");
Note: For future compatibility, it's important to use the prop() function instead of attr(). The difference here is subtle, but attr() will return the state of the CheckBox when it was first loaded on the page. prop() will return the current state of the CheckBox.
function toggle_panel(chkbox)
{
var panel=document.getElementById('<%=panle1.ClientID %>');
chkbox.checked ? panel.style.display='inline':panel.style.display='none';
}
Just make a call to the javascript function,inorder to access a asp.net control from javascript it should be made invisible using style attribute , because javascript will return undefined if Visible="false" is used.
<asp:CheckBox ID="chkboxPanel" runat="server" onclick="toggle_panel(this);" Text="Show" />
<br />
<br />
<asp:Panel ID="panle1" runat="server" Style="display: none">
Iam Text Inside the Panel
</asp:Panel>
Related
I have an aspx application with a RadioButton list like below:
<asp:RadioButtonList runat="server" ID="rblIsDiesel" RepeatLayout="Flow" RepeatDirection="Horizontal">
<asp:ListItem Text="Diesel" class="carFuel" Value="true" Selected="True" />
<asp:ListItem Text="Petrol" class="carFuel" Value="false" />
</asp:RadioButtonList>
In jQuery I am able to get the Buttons using the below:
var buttons = $('span.carFuel input:radio');
However, I am missing how to get the value of which RadioButton is selected.
What I am trying to do in pseudo code would be:
if (buttonSelected == Diesel) {
alert("Diesel")
}
else {
alert("Petrol")
}
And secondly, fire an alert on toggling between the buttons.
if (valueChanged) {
alert("You changed fuel type");
}
For the first question, I was trying to add :checked to the selector and then use .val() but that is giving me an undefined value. I believe the buttons selector I have above is working OK as if I add a debugger line, I can see 2 objects and the correct client side ids for the radio buttons.
And for the second part, I believe I will need to use the jQuery change event - just not sure on the correct selector.
The key thing you seem to be missing is the ClientID.
When a Web server control is rendered as an HTML element, the id attribute of the HTML element is set to the value of the ClientID property.
With that, what you then do is look for the input control that is checked:
var selectedRB = $('#<%= rblIsDiesel.ClientID %> input:checked');
Then to get the value, just call val().
var selectedValue = selectedRB.val();
But remember, this gets the value of the radiobutton, not the text. So with how you have it setup, you would see true or false as the value. And to be honest, I'm not totally sure I understand why the values would be true and false in your implementation - but that is beside the point.
To capture when the selected radiobutton changes, there is a handy change function that you can use:
$('#<%= rblIsDiesel.ClientID %> input').change(function() {
alert("You changed fuel type");
});
I would like to add Javascript code to be fired when the selected index is changed on a dropdownlist in asp.net.
So, here is my DDL:
<asp:DropDownList ID="comboReportTypes" runat="server" />
I would like to add something like this to the above DDL: onSelectionIndexChanged="MyJavascriptFuntion(this)"
So I'd like to end up with something like this:
<asp:DropDownList ID="comboReportTypes" runat="server" onSelectionIndexChanged="MyJavascriptFuntion(this)" />
Is this possible?
Thanks in advance. I'm using ASP.Net 4.0
add onchange event to it from the code .
Eg:
DropDownList dlOption = new DropDownList();
dlOption.Attributes.Add("onchange", "javascript:return functionname(this);");
Using jquery you can easily achieve what you are trying to do
$('#comboReportTypes').change(function(){
//do whatever you need to.
});
See Demo
Note: Make sure you are using the correct ID for the DropDownList as server controls tend to change their ID's on rendering.
I have something that depending if it is clicked or unclicked will do something. The thing is, that i tried to do an onclick and it will not fire. Is there some other thing that is needed for selecting/unselecting a checkbox?
ASP:
<div id = "gridDiv">
Turn on/off some code:
<asp:Checkbox runat="server" name = "gridlock" id = "gridLockAttribute" />
</div>
ClientSide:
$("#gridLockAttribute").click(function(){
try{
alert("test");
}catch(err){
}
});
It doesnt seem to alert.
ASP.NET may be name-mangling your ID if the control is within another control, so things like $("#gridLockAttribute") won't work. You have to use either:
$("#<%= gridLockAttribute.ClientID %>")
Or:
$('[id$=gridLockAttribute]')
I'd prefer the first method.
Furthermore, if you are trying to get the checkbox to cause a postback automatically, you'll need to set the AutoPostBack attribute on the checkbox to True.
I am using ASP.net and have a dropdown control.
<asp:DropdownList runat="server" ID = "fieldReadOnlyContent" Enabled="false" class = "attribute"><asp:ListItem value = "0">False</asp:ListItem><asp:ListItem value = "1">True</asp:ListItem></asp:DropdownList>
I wanted to adjust the dropdown control via the clientside controls qith jquery. I get the value which it needs to be set to.
//d[3] will be either true or false.
$("#fieldReadOnlyContent").val(d[3]);
the above attempt didnt seem to set the item to properly enabled. HOw would i do this?
Try this:
$("#<%=fieldReadOnlyContent.ClientID%>").val(d[3]);
The item is not getting set because $("#fieldReadOnlyContent").val(d[3]); will check for the value.
For your case
if(d[3]=='false'){
$("#fieldReadOnlyContent").val('0');
}
else
{
$("#fieldReadOnlyContent").val('1');
}
fieldReadOnlyContent is not necessarily the ID given to the client-side HTML element.
You can use ClientIDMode="Static" server-side to control the client-side ID in .net4.0 (source), or <%= fieldReadOnlyContent.ClientID %> to inject the client id directly into the javascript otherwise.
I'm using some javascript to disable the checkboxes in a checkboxlist like so:
var objItem = document.getElementById("<%= resCBL.ClientID %>");
var checkBoxes = objItem.getElementsByTagName("input");
if (form1.secTB.value == 0) {
checkBoxes[0].disabled = true;
This code works fine, but when the page renders in IE, the text attribute for the checkbox is rendered as a label, and so only the checkbox seems to grey out, instead of the checkbox AND the text.
If I simply set
Enabled = false
in the .aspx codebehind, it greys out everything, but makes it impossible (with my current method) to re-enable the CB and un-grey the label.
Could anyone tell me how to work around this and help me understand why it's doing this?
Add the disabled attribute to the InputAttributes of the CheckBox instead:
CheckBox1.InputAttributes.Add("disabled", "disabled");
http://geekswithblogs.net/jonasb/archive/2006/07/27/86498.aspx
The problem is that an <asp:checkbox /> control gets rendered out like this:
<span><input type='checkbox'></span>
The real problem comes when you have a checkbox like this: <asp:CheckBox Enabled="false"/>.
This gets rendered out like this:
<span disabled='disabled'><input type='checkbox' disabled='disabled'></span>
If you look at the HTML output from a checkbox control you'll see there is an associated <label for="checkbox_client_id">Text</label> - this is why setting the checkbox as disabled doesn't grey-out the text.
When viewing the page from IE, ASP.NET wraps the <input> and associated <label> with <span disabled="disabled">. IE will disable all elements inside the span, which is why it disabled the checkbox and label.
However, since a span is not a form element, most other browsers follow the W3C rules and ignore the "disabled" attribute it. Disabling a span around the checkbox will only work in IE.
The easiest solution I can think of is to replicate this behavior manually. Wrap the checkbox with a span then, when enabling/disabling the checkbox use CSS to style the span and get the desired effect to work on all browsers.
var objItem = document.getElementById("<%= resCBL.ClientID %>");
var checkBoxes = objItem.getElementsByTagName("input");
if (form1.secTB.value == 0) {
checkBoxes[0].disabled = true;
checkBoxes[0].parentNode.class = "disabled";
}
P.S. Sorry if I sound snarky - IE always annoys me with it's endless "intricacies"