如何使用JavaScript删除/更改输入值 [英] How to remove/change an input value using javascript

问题描述

如何在此输入中删除值"Anonymous"，并使用javascript/jquery将其替换为占位符文本您的姓名"?我无权访问HTML代码.

How do I remove the value 'Anonymous' in this input that I have and replace it with a placeholder text 'Your name' using javascript/jquery? I don't have access to the HTML code.

这是我到目前为止所拥有的，但是真的不知道从那里去哪里.

This is what I have so far, but don't really know where to go from there.

document.getElementById('txtYourName').placeholder =' Your Name ';  

HTML

HTML

<input id="txtYourName" type="text" value="Anonymous" name="txtYourName"></input>

推荐答案

在此添加第二行...仅当值碰巧为空白时，才会看到占位符.使用下面的代码，您可以设置占位符，以及清除字段中的默认值.

Add this second line here... A placeholder is only seen when the value happens to be blank. With the code below, you can set the placeholder, as well as erase the default value in your field.

document.getElementById('txtYourName').placeholder =' Your Name ';  
document.getElementById('txtYourName').value = "";

演示: http://jsfiddle.net/723vL/

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