Highlighting an html document expression in Asp.net mvc using JavaScript

Question

I'm trying to highlight a specific sentence in an html document displayed on the web browser.

I have this action in my controller:

public ActionResult GetHtmlPage(string path)
{
    return new FilePathResult(path, "text/html");
}

and I have this view that shows the html document in the specified path.

@model TextPlagiarismWebApp.Models.ViewModels.ManageDocumentViewModel

@{
    ViewBag.Title = "ManageDocument";
}

<h2>ManageDocument</h2>

@Html.Action("GetHtmlPage", "Upload", new { path = Model.documentPath })

<script type="text/javascript">
    var sen = @Model.sentence["sentence"];
    $("div:contains('" + sen + "')").html(function (_, html) {
        var regex = new RegExp("(" + sen + ")", "g");
        return html.replace(regex, '<span style="background-color:#FFFF00">$1</span>');
    });
</script>

I debugged the program and the sen variable is what I would expect:

var sen = @Model.sentence["sentence"];

But despite that, it's not highlighting the specific sentences that I'm looking for. It only shows the original html document.

Let's take this example where I'm sure the sentence exists:

var sen = "Requirements for breeding tanks vary with each species. Separate tanks may be required."

HTML:

<p class=MsoNormal style='text-align:justify;mso-layout-grid-align:none;
text-autospace:none'><span lang=EN-AU style='color:black'>Requirements for
breeding tanks vary with each species. Separate tanks may be required.<o:p>
</o:p></span></p>

But the sentence is not highlighted, and I can't figure out why.

Any suggestions as to what's wrong?

Answer 1

you can do this

  $("body").html(function (_, innerHTML) {
        var regex = new RegExp("(" + sen + "'))", "g");
        return innerHTML.replace(/\s\s+/g, ' ').replace(/\r?\n|\r/g, '').replace(regex, '<span style="background-color:#FFFF00">$1</span>');
    });

the first replace will .replace(/\\s\\s+/g, ' ') will remove multiple spaces and .replace(/\\r?\\n|\\r/g, '') will remove the break line in paragraph

here is example https://jsfiddle.net/jz86v8we/10/

Edit

you can use Jquery-Highlight-5.js by adding

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>

<script src="http://johannburkard.de/resources/Johann/jquery.highlight-5.js"></script>

and in script use

$("body").highlight("The Business");

and add this to your css file

.highlight { background-color: yellow }