innerHTML不能与JS中的classname一起使用 [英] innerHTML not working with classname in JS

问题描述

我的下拉列表选择特定值 -

My drop down List to select particular value-

<select name="category" id="category" onChange="showDiv(this.value);" >
    <option value="">Select This</option>
    <option value="1">Nokia</option>
    <option value="2">Samsung</option>
    <option value="3">BlackBerry</option>
    </select>

这是我要显示文字的div

This is the div where i want to show the text

< span class =catlink> < / span>

这是我的JS功能 -

And this is my JS function -

    function showDiv( discselect )
    {

    if( discselect === 1)
    {
    alert(discselect); // This is alerting fine
    document.getElementsByClassName("catlink").innerHTML = "aaaaaaqwerty"; // Not working
    }

}

告诉我为什么这不起作用，我做错了什么？

Let me know why this is not working, and what i am doing wrong?

推荐答案

document.getElementsByClassName（catlink ）在网页中选择所有元素为数组，因此您必须使用 [0]

document.getElementsByClassName("catlink")is selecting all the elements in webpage as array therefore you have to use [0]

 function showDiv( discselect ) 
 { 

 if( discselect === 1) 
 { 
 alert(discselect); // This is alerting fine 
 document.getElementsByClassName("catlink")[0].innerHTML = "aaaaaaqwerty"; // Now working 
 } 
 }

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