Check if element exists in jQuery

This question already has an answer here:

Is there an “exists” function for jQuery? 36 answers

---

$('elemId').length doesn't work for me.

You need to put # before element id:

$('#elemId').length
---^

---

With vanilla JavaScript, you don't need the hash ( # ) eg document.getElementById('id_here') , however when using jQuery, you do need to put hash to target elements based on id just like CSS.

---

尝试检查选择器的长度，如果它返回了某些东西，那么该元素必须存在，否则不存在。

 if( $('#selector').length )         // use this if you are using id to check
{
     // it exists
}


 if( $('.selector').length )         // use this if you are using class to check
{
     // it exists
}

---

Try this:

if ($("#mydiv").length > 0){
  // do something here
}

The length property will return zero if element does not exists.

链接地址: http://www.djcxy.com/p/2384.html

上一篇: JQuery检查以查看是否显示Div

下一篇: 检查jQuery中是否存在元素