是否可以根据用户文本输入更新 url 链接? [英] Is it possible to update a url link based on user text input?

问题描述

例如，我知道可以在 Javascript 中做一些事情，允许用户根据用户文本输入更新文本:

For instance, I know that it is possible to do something in Javascript that allows users to update text based on user text input:

<script type="text/javascript">
function changeText2(){
var userInput = document.getElementById('userInput').value;
document.getElementById('boldStuff2').innerHTML = userInput;
}
</script>
<p>Welcome to the site <b id='boldStuff2'>dude</b> </p> 
<input type='text' id='userInput' value='Enter Text Here' />
<input type='button' onclick='changeText2()' value='Change Text'/>

在以下位置查看上面的代码:tizag.com/javascriptT/javascript-innerHTML.php

View the above code in action at: tizag.com/javascriptT/javascript-innerHTML.php

但是，我想知道是否可以对 url 链接执行类似的操作，而不是上面的代码.下面我放置了一个分步示例，说明我希望在用户输入文本时发生的情况:

However, instead of the above code, I would like to know if it's possible to do something similar for a url link. Below I've placed a step by step example of what I would like to happen upon the user inputing text:

1. 原文链接:http://www.google.com/search?q=

文本字段中的用户输入:espn

User Input in Text Field: espn

用户点击按钮提交文本字段中的文本

User clicks button to submit text in text field

最终链接:http://www.google.com/search?q=espn

感谢您的帮助...顺便说一句...如果您看不出来我是个新手，请提供详细信息.

Thanks for your help...BTW...if you can't tell I'm a bit of a novice so detail is appreciated.

推荐答案

这是一个在您输入时更新的纯 JS 格式:

Here's one in plain JS that updates as you type:

<a id="reflectedlink" href="http://www.google.com/search">http://www.google.com/search</a>
<input id="searchterm"/>

<script type="text/javascript">
    var link= document.getElementById('reflectedlink');
    var input= document.getElementById('searchterm');
    input.onchange=input.onkeyup= function() {
        link.search= '?q='+encodeURIComponent(input.value);
        link.firstChild.data= link.href;
    };
</script>

注意:

• 没有内联事件处理程序属性(最好避免使用它们)；

• no inline event handler attributes (they are best avoided);

同时分配 keyup 和 change，以尝试在键盘更新发生时进行更新，并确保最终捕获所有其他更新；

assigning both keyup and change, to try to get keyboard updates as they happen and ensure that all other updates get caught eventually;

使用encodeURIComponent()，以防搜索词中有任何非ASCII或URL特殊字符；

the use of encodeURIComponent(), necessary in case the search term has any non-ASCII or URL-special characters in;

设置 Location(链接)对象的 search 属性，以避免再次写出整个 URL；

setting the search property of a Location (link) object to avoid having to write out the whole URL again;

设置链接内 Text 节点的 data 以反映完整的 URL.不要从用户输入中设置 innerHTML 因为它可能包含 HTML 特殊字符，例如 & 和 <在.

setting the data of the Text node inside the link to reflect the full URL afterwards. Don't set innerHTML from user input as it may have HTML-special characters like & and < in.

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