web开发中常用的js

将自己在web开发中经常用到的一些JS总结一下。

1.修改标签和表单的值

修改标签的值：

var  customer = document.getElementById( "custm"  ).innerHTML;

alert(customer);

document.getElementById(  "custm" ).innerHTML =  "name"

修改控件(input)的值:

var  userName = document.getElementById( "userName" );

alert(userName.value);

userName.value =  "new value"  ;

2.js提交form表单

function  updateInfo(formName) {

     var  form = document.getElementById(formName);

    form.submit();

}

3.自定义html中file控件

< input  type =  "file"  id  = "fileupload"  name =  "fileupload"  style =" display  : none " />

< input  type =  "button"  onclick  = "fileupload.click()"  id = "uploadFileButton"  value = "浏 览 ..."  class  = "btn" />

< input  type = "submit"  name =  "submit"  value  = "上传"    onclick = "return ajaxFileUpload();"  class = "btn" >

4.实现多个复选框的多选和单选

全选

function  checkAll(checkall_id, checkName) {

      var  checkArr = document.getElementsByName(checkName);

      var  checkAll = document.getElementById(checkall_id);

      if (checkAll.checked ==  true  ) {

           for  ( var  i=0; i<checkArr.length; i++) {

             checkArr[i].checked =  true  ;

         }

    }  else  {

           for  ( var  i=0; i<checkArr.length; i++) {

             checkArr[i].checked =  false  ;

         }

    }

}

单选

function  checkSingle(single_id, checkName) {

      var  checkArr = document.getElementsByName(checkName);

      var  checkSingle = document.getElementById(single_id);

      for (  var  i=0; i<checkArr.length; i++) {

           if  (checkArr[i].value != single_id) {

             checkArr[i].checked =  false  ;       

         }  else  {

             checkArr[i].checked =  true  ;

         }

    }

}

4.在加载页面的时候调用js方法

<script type= "text/javascript" >

window.onload= function ()  //用window的onload事件，窗体加载完毕的时候

{

    //do something

}

</script>