我该如何修改我的<textarea>&lt;i&gt;html value based on user input&lt;/div&gt;&lt;/i&gt; &lt;b&gt;html 值基于用户输入&lt;/div&gt;&lt;/b&gt;</textarea><div id="text_translate"><p> 我的页面中有一个 html textarea 元素，用户在其中提供逗号分隔值。 例如下面。<br> A-48402,AA,SBAFL,AA+,USD,,</p><p> 从 javascript （我更喜欢）我正在应用逻辑来检查最后一行值是否为空白（仅由逗号分隔）然后放置一个字符串值'Y'。 因此，我正在写以下内容</p><pre>var data = document.getElementById('txid').value; rows = data.split('\n');var row1 = rows[0];row1Values=row1.split(',');</pre><p> 然后我应用逻辑来验证每一行的最后一个值是否为空白，实际上是空白，然后添加以下内容。</p><pre> row_values.push('Y');</pre><p> 它反映在调试器中。</p><p> 但我看到的是 Java 操作 class 中的值“Y”在页面提交时没有反映和显示通常的“Y”。 如何在每一行末尾（有空白的地方）添加这个值'Y'，以便它在 class 中可见？</p><pre> String Data = request.getParameter('mbs_inst_data');</pre><p> 该数据填充了相同的空白值。</p></div>

Question

I have a html textarea element in my page where user gives comma separate values. for example below.
A-48402,AA,SBAFL,AA+,USD,,

From javascript (which I prefer) I am applying logic to check if the last row value is blank (separated by comma only) then to put a String value 'Y'. Thus I am writing the below

var data = document.getElementById('txid').value; 
rows = data.split('\n');var row1 = rows[0];row1Values=row1 .split(',');

Then I am applying logic to verify whether the last value for every row is blank or not, which is actually blank, then adding the below.

row_values.push('Y');

It is reflecting in debugger.

But what I see is the value 'Y' in the Java action class is not reflecting and showing usual 'Y' while the page submit. How can I add this value 'Y' in every rows end (where there is blank) so that it will be visible in action class?

String Data = request.getParameter('mbs_inst_data');

This data is populated with the same blank values.

Answer 1

You can use it like this.

<p id="demo">Visit Microsoft! ,,</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
  var str = document.getElementById("demo").innerHTML; 
  var res = str.replace(/,,$/, ',Y');
  document.getElementById("demo").innerHTML = res;
}
</script>

Output

Visit Microsoft! ,Y

I guess this would help you.

Answer 2

If you're only checking for the last row then the only case that would happen is when it's,, so you can just do a simple check

let data = 'A-48402,AA,SBAFL,AA+,USD,,'
data = data.split(',')
let lastRowIsBlank = data[data.length-2] === ""
// we are doing length - 2 because in your situation we have 2 "" 
// since you have two commas. If you have only 1 comma we would 
// the same steps but with length - 1 
if(lastRowIsBlank) data[data.length-2] = "Y"
return data.toString()