Javascript checks whether the check box is selected

Javascript checks whether the check box is selected. The following example shows how to check the check box (there are currently a set of check boxes ):

<Input type = "checkbox" name = "fruit" value = "apple"/> apple <input type = "checkbox" name = "fruit" value = "orange"/> orange <input type = "checkbox" name = "fruit" value = "banana"/> banana <input type = "checkbox" name = "fruit" value = "grape"/> grape

You can obtain the value of a set of check boxes for name = fruit as follows:

<Script language = "javascript"> function checkbox () {var str = document. getElementsByName ('fruit'); var strLen = str. length; var checkVal = ''; for (I = 0; I <strLen; I ++) {if (str [I]. checked = true) {checkVal + = str [I]. value + ',';} if (checkVal = '') {alert (" Please select the check box first ~! ");} Else {alert (" check box value: "+ checkVal) ;}</script>

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