How to implement .indexof for an array of strings?

Question

How can I simplify below code? How can I get rid of the if statements? I want to highlight some lines in ajax response. Right now I have two strings to compare = two ifs. This number will increase so I am thinking of doing this some other way - using an array of the strings that needs to be highlighted in case the string is part of data_array element.

I prefer a solution in javascript only but jQuery is ok too.

    data_array=data.split('<BR>');
    for(var i=0, len=data_array.length; i < len; i++){
        if (data_array[i].indexOf('Conflict discovered') >= 0){
            data_array[i]="<span class='red'>"+data_array[i]+"</span>";
        }   
        if (data_array[i].indexOf('Syntax error') >= 0){
            data_array[i]="<span class='red'>"+data_array[i]+"</span>";
        }   
    }
    data=data_array.join('<BR>');

Answer 1

Why not add another for loop?

data_array=data.split('<BR>');

var stringsToFind = ['Conflict discovered', 'Syntax error'];

for (var i = 0; i < data_array.length; i++) {

    for (var j = 0; j < stringsToFind.length; j++) {

        var currItem = data_array[i];

        if (currItem.indexOf(stringsToFind[j]) >= 0) {

            data_array[i]='<span class="red">' + currItem + '</span>';
        }
    }  
}

data = data_array.join('<BR>');

jQuery (note, may be slower, and I haven't tested this yet)

data_array=data.split('<BR>');

var stringsToFind = ['Conflict discovered', 'Syntax error'];

$.each(data_array, function(i, item) {
    $.each(stringsToFind, function(j, s) {
        if (item.indexOf(s) >= 0) {
            data_array[i]='<span class="red">' + item + '</span>';
        }
    }
});

data = data_array.join('<BR>');

Answer 2

Add more elements to the array as desired :)

data.replace( /<br>/ig, '\n' ).replace(
    new RegExp( '^(.*(?:' + [
          'Conflict discovered'
        , 'Syntax error'
    ].join( '|' ) + ').*)$', 'gm' )
, '<span class="red">$1</span>' ).replace( /\n/g, '<br>' );

explanation:

• replace <br> tags with line breaks
• make a regexp: ^(.*(?:Conflict discovered|Syntax error).*)$
• surround matches with <span class="red"> ... </span>
• turn line breaks back in to <br> tags

Answer 3

var data_array = data.split('<BR>');
var errMsgs = ['Conflict discovered', 'Syntax error'];
data_array = data_array.map(function(data_rec) {
    var isAnError = errMsgs.some(function (errMsg) {
        return data_rec.indexOf(errMsg) >= 0;
    });
    if (isAnError) {
        return "<span class='red'>" + data_rec + '</span>';
    } else {
        return data_rec;
    }
});

Answer 4

jsBin demo

var highlightWords = ['Conflict discovered', 'Syntax error', 'Simply cool'];

for(i=0; i<highlightWords.length; i++){
  var regex = new RegExp(highlightWords[i],'ig');
  data= data.replace( regex, '<span class="red">'+ highlightWords[i] +'</span>');
}

$('div').html( data );

---

jsBin demo 2 all line highlight

var words = ['Conflict discovered', 'Syntax error', 'Strange'];
var data_array=data.split('<BR>');

for(n=0;n<words.length;n++){
  for(i=0; i<data_array.length; i++){
      if (data_array[i].indexOf( words[n] ) >= 0){
           data_array[i]="<span class='red'>"+data_array[i]+"</span>";
      }   
  }
  data = data_array.join('<BR>');
}

$('div').html( data );

Answer 5

data_array=data.split('<BR>');
for(var i=0, len=data_array.length; i < len; i++){
    var dai = data_array[i];
    if (dai.indexOf('Conflict discovered') >= 0 || dai.indexOf('Syntax error') >= 0){
        data_array[i] = "<span class='red'>"+dai+"</span>";
    }   
}
data=data_array.join('<BR>');