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Javascript code for Selecting All and canceling all CheckBox _ form special effects

Source: Internet
Author: User
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In batch processing of List data, all selection and cancellation of CheckBox are often used. Although her implementation principle is very simple, it is still difficult for new users. The method described in this article. The trigger conditions are independent. You can select or cancel all the checkboxes with the specified name. On the same page, multiple groups of checkboxes can be selected for the full selection. The function is sound and the versatility is strong.
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Run to view the effect:

<Body> <script type = "text/javascript"> function checkAll (name) {var el = document. getElementsByTagName ('input'); var len = el. length; for (var I = 0; I <len; I ++) {if (el [I]. type = "checkbox") & (el [I]. name = name) {el [I]. checked = true ;}} function clearAll (name) {var el = document. getElementsByTagName ('input'); var len = el. length; for (var I = 0; I <len; I ++) {if (el [I]. type = "checkbox") & (el [I]. name = name) {el [I]. checked = false ;}} script <input type = "checkbox" name = "test" value = "" onclick = "if (this. checked = true) {checkAll ('test');} else {clearAll ('test ');} "/> enable <input type =" checkbox "name =" test "value =" a "/> a <input type =" checkbox "name =" test "value = "B"/> B <input type = "checkbox" name = "test" value = "c"/> c <input type = "checkbox" name = "test" value = "d"/> d <input type = "checkbox" name = "test" value = "e"/> e <input type = "checkbox" name = "test" value = "f"/> f <input type = "checkbox" name = "test" value = "g"/> g <br> <input type = "checkbox" name = "num "value =" "onclick =" if (this. checked = true) {checkAll ('num');} else {clearAll ('num ');} "/> number selection switch <input type =" checkbox "name =" num "value =" 1 "/> 1 <input type =" checkbox "name =" num "value = "2"/> 2 <input type = "checkbox" name = "num" value = "3"/> 3 <br> <input type = "button" value = "select all letters" onclick = "checkAll ('test ') "/> <input type =" button "value =" Clear the selected Letter "onclick =" clearAll ('test ') "/> <br> <input type =" button "value =" select all numbers "onclick =" checkAll ('num ') "/> <input type =" button "value =" Clear the selected number "onclick =" clearAll ('num') "/> </body>
[Ctrl + A select all Note: If you need to introduce external Js, You need to refresh it to execute]


Js Functions

The Code is as follows:


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