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:
$('#<%= rblIsDiesel.ClientID %> input').change(function() {
alert("You changed fuel type");
});
Related
HI so my JS skills are a little rusty but I'm trying to create a few functions so they work on the client side, rather than running server code, here's what I'm trying to do:
I have a drop down control, and a textbox. The textbox is depended on the value from down down and is disabled on page load.
i'm trying to call a function so if YES is selected from dropdown, the textbox will be enabled for text entry. Here's what I'm doing:
function DependentControlByDropDown(sender, Control, DependentControlID) {
try {
var senderControl = sender.selectedOptions[0].text;
var controlEnable = (senderControl == Control);
console.log(controlEnable);
var control = document.getElementById(DependentControlID); this gives me NULL if i do console.log(control)
DependentControlID.disabled = controlEnable; //controlEnable has a value of either TRUE or FALSE but it doesn't work on DependentControlID
}
catch (e) {
alert("DependentControlByDropDown : " + e.message);
}
}
I'm calling this in dropdown like so:
onchange="DependentControlByDropDown(this,'Yes','txtbox1')"
So what's happening here is I get the right value 'Yes', or 'No' I tested it with console.log. The problem is with the dependednt control. If I do console.log(DependentControlID) it is showing me the correct control, but when I try to disabled=false it doesn't work. I also tried document.getElementByID(DependentControlID).disabled=false but that doesn't work either. Any help?!
As we've deduced in the comments of your question, you're using ASP.NET.
This is extremely important to note, because ASP.NET overrides assigned IDs to ensure that they are unique. For example, if you were to do...
<asp:Textbox runat="server" id="txtbox1"></asp:Textbox>
...the rendered HTML may look something like (example)...
<input id="ctl00$MainContent$txtbox1">
Because of this, getElementById("txtbox1") doesn't find anything.
To prevent this from happening, you can add ClientIdMode="static" to your textbox:
<asp:Textbox runat="server" ClientIdMode="static" id="txtbox1"></asp:Textbox>
The rendered HTML will now be the following...
<input id="txtbox1">
NOTE: If you have more than one of these textboxes on the page, for example if you're using it in a GridView or a Repeater, do not use ClientIdMode="static"! It will create duplicate IDs, which are not valid.
The problem is that you were trying to access the textbox via it's ID as text. You need set the disabled attribute on it's node value, which you already have, i.e. control.
Additionally you were trying to set the textbox's disabled attribute to the same value as controlEnable. I've set it to the OPPOSITE of controlEnable
function DependentControlByDropDown(sender, Control, DependentControlID) {
try {
var senderControl = sender.selectedOptions[0].text;
var controlEnable = (senderControl == Control);
console.log('controlEnable',controlEnable);
console.log('DependentControlID', DependentControlID);
var control = document.getElementById(DependentControlID);
console.log('control', control);
control.disabled = !controlEnable;
} catch (e) {
alert("DependentControlByDropDown : " + e.message);
}
}
<input id="txtbox1" />
<select onchange="DependentControlByDropDown(this,'Yes','txtbox1')">
<option value=""></option>
<option value="Yes">Yes</option>
<option value="No">No</option>
</select>
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 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>
I have an ASP.NET TextBox ID="txtDate" in my usercontrol. It has ValidationGroup="MyUC" set. Now my UC is inside a Repeater Control. So there will be multiple instances of the same textbox.
I am able to get all textboxes like: $("[id$='_txtDate']");
Each of the txtDate will have a separate ValidationGroup assigned to it, dynamically.
So I want to get a textbox based on the id + ValidationGroup using jQuery / javascript.
How can it be done? Any guidance really appreciated.
Edited based on Josiah's Reply and the way I found:
Sorry, my scenario is kind of complicated to include entire code. In short the textboxes are attached to jquery datepicker and the code below runs when a date is selected. The same handler is attached to multiple textboxes. Here is what I have:
var valgrp="MyGroup"; /*this mygroup is dynamic but keeping static for e.g.*/
var txtdate1 = $("[id$='txtDate']").filter(function(){if(this.Validators!=null){return this.Validators[0].validationGroup == valgrp;}});
var txtdate2 = $("[id$='txtDate']").filter(function(){return this.validationGroup == valgrp;});
alert("date1- " + txtdate1.val()); /*this returns date selected from datepicker*/
alert("date2 " + txtdate2.val()); /*this returns empty*/
Depending on the date I want to do something else. So txtdate1 is currently working for me where I don't have to add class to my textbox. I was playing with the txtdate2 which isn't behaving how I was expecting and so I had to post this question.
Here is a sample test to see this.validationGroup not returned:
$(function () {
$("#btntest").click(function () {
$("[id$='txtDate']").each(function () {
alert(this.validationGroup);//returns undefined
alert(this.Validators[0].validationGroup); //returns "test"
});
});
});
<input id="btntest" type="button" value="button" />
<asp:TextBox ID="txtDate" runat="server" ValidationGroup="test"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" Text="*" ErrorMessage="Required." ControlToValidate="txtDate" ValidationGroup="test"></asp:RequiredFieldValidator>
While Josiah's solution didn't work but his idea of attaching class to textbox could have been a potential solution. Since it didn't exactly fit my needs I would answer my own question. Here is the solution I came up with:
var valgrp="MyGroup"; /*this mygroup is dynamic but keeping static for e.g.*/
var txtdate1 = $("[id$='txtDate']").filter(function(){if(this.Validators!=null){return this.Validators[0].validationGroup == valgrp;}});
The above returns me the textbox I am looking for. The key is
this.Validators[0].validationGroup
It gets the validationGroup of the first validator control attached to the textbox (this).
From a few searches, the validation group is stored as a property on the Form Element.
So you can add a class selector like so:
$("[id$='_txtDate']").each(function(){
var group = this.validationGroup,
$this = $(this);
if(!$this.hasClass('validationgroup'))
$this.addClass('validationgroup ' + group);
});
Of course if you have a repeater you will need to run this code each time an row is repeated. But now you can select fields by validation group like this:
$('.validationgroup.[group name]')
I don't use jQuery, but I'd think it would be:
$("#txtDate[ValidationGroup='MyUc']")
since jQuery's selectors are based on CSS. That works with document.querySelector, unless having more that one element with the same id is causing problems.