Html 使用纯 Javascript 创建输入字段

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时间:2020-08-29 10:19:52  来源:igfitidea点击:

Create an input field using pure Javascript

javascripthtmlcreateelement

提问by Enrique Moreno OB

Im trying to create such element only with JS:

我试图只用 JS 创建这样的元素:

<input type="text" value="default">

To do so, I tried this code:

为此,我尝试了以下代码:

var mi = document.createElement("input");
mi.type= "text"
mi.value = "default"

But when I run it in Chrome Dev Tools, it only creates this element:

但是当我在 Chrome Dev Tools 中运行它时,它只会创建这个元素:

<input type="text">

What am I missing?

我错过了什么?

回答by Paul S.

Setting a propertyof a HTMLElementisn't exactly the same as setting it's attributeto the same thing.

设置一个物业一的HTML元素是不完全一样的,因为它的设置属性,以同样的事情。

You most likely wanted to use element.setAttribute

您很可能想使用 element.setAttribute

var mi = document.createElement("input");
mi.setAttribute('type', 'text');
mi.setAttribute('value', 'default');

Now you can see

现在你可以看到

new XMLSerializer().serializeToString(mi);
// "<input type="text" value="default">"

In your example, the valuedisplayed by the <input>will still be default, it just isn't set as the attribute.

在您的示例中,显示的<input>仍然是default,只是没有设置为属性

Further note that if the user changes the valueof <input>, e.g. types into it, setting the attributewill not change the valueany longer, but setting the valueproperty will still change it. Again, this is because an attributeis different to a property.

还应注意的是,如果用户更改<input>,如类型进去,设置属性不会改变数值的任何时间较长,但设置属性将改变它。同样,这是因为attributeproperty不同。

回答by karthi

var i = document.createElement("input"); //input element, text
i.setAttribute('type',"text");
i.setAttribute('name',"username");
i.setAttribute('value',"default");

回答by Cyrille Armanger

I think you are missing the ; after "text".

我认为你错过了; 在“文本”之后。