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Checkbox and ListBox Example on Javascript


The checkbox is used to check multiple options in a group of items and Listbox is also used to select multiple items in a group of options.

In this article, I am providing the script code that is used to manage event under Checkbox and ListBox.

Tag of Checkbox:-

<input type="checkbox"   name="chk"   />

Tag of Listbox:-

<select id="lst[]" multiple="true" style="width:300px;">

<option value="C">C</option>

    <option value="C++">C++</option>

    <option value="DS">DS</option>

    <option value="JAVA">Java</option>

    <option value=".NET">.NET</option>

</select>

Now I am providing a complete example of CheckBox and ListBox using Event.

<!DOCTYPE html>

<html>

<head>

<title></title>

<script type="text/javascript">

function fun()

{

            s = "";

            console.log("click"+document.frm.chk.length);

            for(i=0;i<document.frm.chk.length;i++)

            {

              if(document.frm.chk[i].checked)

                  {         s = s+ document.frm.chk[i].value;

                  }

            }

           s1="";

           for(i=0;i<document.getElementById("lst[]").length;i++)

            {          

                if(document.getElementById("lst[]")[i].selected)

                  {                  s1 = s1+ document.getElementById("lst[]")[i].value;

                  }

            }

            document.getElementById("res").innerHTML = "name is " + document.frm.txtname.value+s + "Course is "+s1;

}

</script>

</head>

<body>

<form name="frm" action="">

<input type="text" name="txtname" /> <br>

<input type="checkbox" name="chk" value="C" />C <br>

<input type="checkbox" name="chk" value="C++" />C++ <br>

<input type="checkbox" name="chk" value="DS" />DS <br>

<br><br>

<select id="lst[]" multiple="true" style="width:300px;">

<option value="C">C</option>

    <option value="C++">C++</option>

    <option value="DS">DS</option>

    <option value="JAVA">Java</option>

    <option value=".NET">.NET</option>

</select>

<br><br>

<input type="button" id="btnclick" onclick="fun()" value="Click" />

<br>

<div id="res"></div>

</form>

</body>

</html>

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