根据特定输入触发事件到textarea [英] Trigger event based on specific inputs into a textarea

问题描述

导致这种情况的原因或者是某人按下了一个按钮来触发一个JS事件。返回键四次，一个人粘贴包含四个换行符的文本，或者删除一些导致连续四次换行符的内容（即段落）。

谢谢

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解决方案

请尝试以下解决方案：

  document.getElementById（textArea）。addEventListener（keyup，function（event）{
 var numberOfLineBreaks =（this.value.match（/ \ / g）|| []）。length; 
 if（numberOfLineBreaks === 4）{
 console.log（4连续行！）; 
} 
}）; 
  

I'm trying to trigger a JS event when there are four consecutive linebreaks inside of a textarea.

The situation causing this would either be that a person presses the RETURN key four times, a person pastes text that contains four line breaks, or they delete some content (ie a paragraph) that results in four consecutive linebreaks.

Thanks

解决方案

Try below solution:

document.getElementById("textArea").addEventListener("keyup", function(event) {
  var numberOfLineBreaks = (this.value.match(/\n/g)||[]).length;
  if (numberOfLineBreaks === 4) {
    console.log("4 consecutive Lines!");
  }
});

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