【javascript】checkbox——类似邮箱全选功能
<div id="cnblogs_post_body">现在很多邮箱都有全选的功能，我也做了个练练手。<div class="cnblogs_code"><!DOCTYPE HTML><html lang="en-US"><head> <meta charset="UTF-8"> <title>checkbox</title></head><body> <input type="checkbox" name="btn" id="btn"/><label for="btn">全选</label><br/> <input type="checkbox" name="choose" id="checkbox1"/><label for="checkbox1">选项1</label><br/> <input type="checkbox" name="choose" id="checkbox2"/><label for="checkbox2">选项2</label><br/> <input type="checkbox" name="choose" id="checkbox3"/><label for="checkbox3">选项3</label><br/> <input type="checkbox" name="choose" id="checkbox4"/><label for="checkbox4">选项4</label><br/> <input type="checkbox" name="choose" id="checkbox5"/><label for="checkbox5">选项5</label><br/> <input type="checkbox" name="choose" id="checkbox6"/><label for="checkbox6">选项6</label><br/> <input type="checkbox" name="choose" id="checkbox7"/><label for="checkbox7">选项7</label><br/> <input type="checkbox" name="choose" id="checkbox8"/><label for="checkbox8">选项8</label><br/> <input type="checkbox" name="choose" id="checkbox9"/><label for="checkbox9">选项9</label><br/> <input type="checkbox" name="choose" id="checkbox10"/><label for="checkbox10">选项10</label><br/></body></html><script type="text/javascript">window.onload = function(){ var oBtn = document.getElementById('btn'); var oInput = document.getElementsByName('choose'); for(var i = 0;i < oInput.length; i++){ oInput.onclick = function(){ if(this.checked){ var allCheck = true; for(var j = 0;j < oInput.length; j++){ if(!(oInput.checked)){ allCheck = false; } }; if(allCheck){ oBtn.checked = true; }else{ oBtn.checked = false; } }else{ oBtn.checked = false; } } }; //全选 oBtn.onclick = function(){ if(oBtn.checked){ for(var i = 0;i < oInput.length; i++){ oInput.checked = true; } } else { for(var i = 0;i < oInput.length; i++){ oInput.checked = false; } } };}</script>
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