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ASP.NET Hosting Tutorial – How To Run Common CheckBox Operations
In this post, we will explains how to run common operations (like check/uncheck checkboxes by value/text/index, min/max selection limit..etc) on ASP.NET CheckBoxList control using jQuery.
How To Run Common CheckBox Operations in ASP.NET
Step 1
Let’s have following aspx code:
123<asp:CheckBoxList ID="CheckBoxList1" runat="server"></asp:CheckBoxList><input type="button" value="OK" id="demo" />Code on the server side:
1234567891011Dictionary<int,string> dictItems = new Dictionary<int,string>();dictItems.Add(1, "Item-1");dictItems.Add(2, "Item-2");dictItems.Add(3, "Item-3");dictItems.Add(4, "Item-4");dictItems.Add(5, "Item-5");CheckBoxList1.DataSource = dictItems;CheckBoxList1.DataTextField = "Value";CheckBoxList1.DataValueField = "Key";CheckBoxList1.DataBind();Rendered HTML code:
1234567891011121314<table id="MainContent_CheckBoxList1"><tr><td><input id="MainContent_CheckBoxList1_0" type="checkbox" name="ctl00$MainContent$CheckBoxList1$0" value="1" /><label for="MainContent_CheckBoxList1_0">Item-1</label></td></tr><tr><td><input id="MainContent_CheckBoxList1_1" type="checkbox" name="ctl00$MainContent$CheckBoxList1$1" value="2" /><label for="MainContent_CheckBoxList1_1">Item-2</label></td></tr><tr><td><input id="MainContent_CheckBoxList1_2" type="checkbox" name="ctl00$MainContent$CheckBoxList1$2" value="3" /><label for="MainContent_CheckBoxList1_2">Item-3</label></td></tr><tr><td><input id="MainContent_CheckBoxList1_3" type="checkbox" name="ctl00$MainContent$CheckBoxList1$3" value="4" /><label for="MainContent_CheckBoxList1_3">Item-4</label></td></tr><tr><td><input id="MainContent_CheckBoxList1_4" type="checkbox" name="ctl00$MainContent$CheckBoxList1$4" value="5" /><label for="MainContent_CheckBoxList1_4">Item-5</label></td></tr></table><input type="button" value="OK" id="demo" />Step 2
How to get value of selected items:
1234567891011$("#demo").click(function () {var selectedValues = [];$("[id*=CheckBoxList1] input:checked").each(function () {selectedValues.push($(this).val());});if (selectedValues.length>0) {alert("Selected Value(s): " + selectedValues);} else {alert("No item has been selected.");}});
How to get index of selected items:
123456$("#demo").click(function () {var $ctrls = $("[id*=CheckBoxList1] input:checkbox");$("[id*=CheckBoxList1] input:checked").each(function () {alert($ctrls.index($(this)));});});It will display 0 based index of selected items. Suppose we select Item-1,Item-3,Item-4 then It’ll give output 0,2,3 in alert boxes.
How to get text of selection items:
12345$("#demo").click(function () {$("[id*=CheckBoxList1] input:checked").each(function () {alert($(this).next().html());});});As you’ve seen, Text is placed in label control(next of checkbox) in rendered HTML. So, $(this).next().html() is used to get text.
How to check/uncheck all checkboxes:
12$("[id*=CheckBoxList1] input:checkbox").prop('checked',true); //To check all$("[id*=CheckBoxList1] input:checkbox").prop('checked',false);// To uncheck allHow to check items by index:
uppose you have to check items by the given index.
1234var selIndex = [0, 2, 3];for (var i = 0; i < selIndex.length; i++) {$("[id*=CheckBoxList1] input:checkbox").eq(selIndex[i]).prop('checked', true);}Similarly, you can uncheck items by setting “false” in prop.
How to check items by value:
12345var selValue = [1, 2, 4];var $ctrls = $("[id*=CheckBoxList1]");for (var i = 0; i < selValue.length; i++) {$ctrls.find('input:checkbox[value=' + selValue[i] + ']').prop('checked', true);}In this Label text is compared and if text exists then corresponding checkbox is checked. The above code will select Item-1 and Item-3.
How to max selection limit:
The following code limits the number of checkboxes a user can select simultaneously:
1234567$("[id*=CheckBoxList1] input:checkbox").change(function () {var maxSelection = 3;if ($("[id*=CheckBoxList1] input:checkbox:checked").length > maxSelection) {$(this).prop("checked", false);alert("Please select a maximum of " + maxSelection + " items.");}})Similarly, you can implement Min Selection criteria.
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