Question

我有一个字符串，可以像

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged

现在，在这里，我有一个json，它有字符串开始和结束偏移，我想突出显示。现在，我使用的逻辑是这样的 -

$scope.highlightHTML = function(content, startoffset, endoffset) {
  var className = 'mark';
  console.log(content.substring(startoffset, endoffset));
  return content.replace(content.substring(startoffset, endoffset), '<span class="' + className + '">$&</span>');
}
//Only if you don't know if they are in the correct order:
jsonDataArray = jsonDataArray.sort((a, b) => a.startOffset - b.startOffset);

for (var i = jsonDataArray.length - 1; i >= 0; i--) {
  const item = jsonDataArray[i];
  responseData = $scope.highlightHTML(responseData, item.startOffset, item.endOffset, item.color);
};
$rootScope.data.htmlDocument = responseData.replace(/\n/g, "</br>");

所以，这里我试图从数组的最后一个值突出显示，以便不会改变偏移量。现在，在这有一个问题，就像重叠。现在，让我们说，

在本文中，我通过添加一些span类来突出显示Lorem Ipsum has been。现在，对于下一次交互，如果startoffset和endoffset有一个只是Ipsum has been the industry's standard的字符串。现在，这两个将重叠，然后突出显示重叠。所以，我无法得到确切的文本，因为偏移量会发生变化。

现在，我应用的另一个解决方案就像 -

var length = '<span class="mark"></span>'.length:
jsonDataArray.forEach(function(item, index) {
    responseData = $scope.highlightHTML(responseData, item.startOffset + (index * length), item.endOffset + (index * length), item.color);
});
$rootScope.data.htmlDocument = responseData.replace(/\n/g, "</br>");

但是这里也存在同样的问题，比如如果一件事的某些部分存在于另一件事件中则会产生一些问题。任何人都可以帮我这个吗？

Answer 1

为了避免跟踪索引的移动，我建议您将输出字符串单独存储或存储在数组中，如下所示：

const str = 'Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry\'s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged';

const highlights = [{startOffset: 2, endOffset: 16}, {startOffset: 68, endOffset: 75}, {startOffset: 80, endOffset: 92}];

const result = [];
let currentIndex = 0;

highlights.forEach(h => {
  result.push(str.substring(currentIndex, h.startOffset));
  result.push(`<span class="mark">${str.substring(h.startOffset, h.endOffset)}</span>`);
  currentIndex = h.endOffset;
});

result.push(str.substring(currentIndex, str.length));

document.getElementById('root').innerHTML = result.join('');

.mark {
  color: red;
}

<div id="root"></div>

将一个字符串重叠到另一个字符串突出显示问题

1 个答案: