textarea中的JavaScript字符串替换
我正在尝试创建一个简单的页面来“更正”YouTube的旧嵌入代码,以便它在PowerPoint 2010中工作。如果我将嵌入代码硬编码到页面上的文本区域中,效果很好,但是如果用户将嵌入代码粘贴到文本区域中,javaScript似乎无法运行 请看这里: 以下是我目前掌握的情况:textarea中的JavaScript字符串替换,javascript,string,replace,Javascript,String,Replace,我正在尝试创建一个简单的页面来“更正”YouTube的旧嵌入代码,以便它在PowerPoint 2010中工作。如果我将嵌入代码硬编码到页面上的文本区域中,效果很好,但是如果用户将嵌入代码粘贴到文本区域中,javaScript似乎无法运行 请看这里: 以下是我目前掌握的情况: <p>Click the button to "fix" the old embed code</p> <textarea rows="10" cols="60" id="demo">
<p>Click the button to "fix" the old embed code</p>
<textarea rows="10" cols="60" id="demo"></textarea>
<br/>
<script>
function myFunction()
{
var str=document.getElementById("demo").innerHTML;
var n=str.replace(/\/\/www.youtube/g,"http://www.youtube").replace(/version=3/g,"version=2");
document.getElementById("demo").innerHTML=n;
}
</script>
<button onclick="myFunction()">Try it</button>
单击按钮“修复”旧的嵌入代码
函数myFunction()
{
var str=document.getElementById(“demo”).innerHTML;
var n=str.replace(/\/\/www.youtube/g,“http://www.youtube替换(/version=3/g,“version=2”);
document.getElementById(“demo”).innerHTML=n;
}
试试看
谢谢你的帮助
var str=document.getElementById("demo").innerHTML;
您应该使用
.value
而不是.innerHTML
您应该使用value
而不是innerHTML
function myFunction2()
{
var str=document.getElementById("demo2").value;
var n=str.replace(/\/\/www.youtube/g,"http://www.youtube").replace(/version=3/g,"version=2");
document.getElementById("demo2").value=n;
}
将文本区域放在表单标签内 然后使用
var str=document.getElementById("demo").value;
// hope this would be usefull
// i used these codes for auto completing the texts in textarea.
// other methods change all matching items before the selected text
// but this affects only the text where caret on.
// at first, i divided textarea.value into 3 pieces. these are ;
// p1; until the 'searched' item, p2 after 'searched' item
// and pa = new item that will replaced with 'searched' item
// then, i combined them together again.
var tea = document.getElementById(targetTextArea);
caretPosition = tea.selectionStart - ara.length; //ara=searched item
p1 = tea.value.substring(0,caretPosition);
console.log('p1 text : ' + p1);
p2 = tea.value.substring(caretPosition+ara.length,tea.value.length);
console.log('p2 text : ' + p2);
pa = yeni; //new item
console.log('pa text : ' + pa);
tea.value = p1 + pa + p2;
tea.selectionStart = caretPosition + yeni.length;
tea.selectionEnd = caretPosition + yeni.length;
tea.focus();