Javascript: Replace backslashes with double backslashes

Question

I'm currently having the problem mentioned in the title and I'm somehow not finding a way to properly replace backsashes with double backslashes, so that I can properly give the string to a webservice as parameters. Let me show you what I tried. Some of these do actually work for some other people, but not for me... I'm currently testing this with FF18.0.1

WSParameters.replace(/\\/g, "\\\\\\\\");
WSParameters.replace("\\", "\\\\\\\\");
WSParameters.replace(/\\/g, "\\\\");
WSParameters.replace(/\\/g, "&#92;&#92;");
WSParameters.replace(/\\/g, "&#92;");
WSParameters.replace("\\", "\\\\");

Thanks a lot in advance

EDIT: I should mention that it's somehow parsed into JSON and with firebug I see the backslash in the source string, but not in the JSON view. Maybe there is another way? But somehow it's already failing at the replacement of the backslashes.

EDIT2:

if (noAction == false) {
    $.ajax({
        type: "POST",
        url: "WebService.asmx/" + webMethod,
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        async: pAsync,
        data: WSParameters,
        success: function callFunction(result) { processPOSTResults(result, pType, pNot);},
        error: function (xhr, ajaxOptions, thrownError) {
            alert('Error while communicating with WebAdmin web service. - ' + xhr.status + " " + thrownError);
        }
    });
}

Because this will escape the ', so the string definition is broken. — ArgisIsland
– ArgisIsland, Commented Jan 31, 2013 at 11:19
Watch out with just relying on Firebug's output. When you log "\\" (a backslash) to the console, it prints as "\". Similarly, "\"" (a quote) is output as """. By the looks of it, the third example should work just fine. — Mattias Buelens
– Mattias Buelens, Commented Jan 31, 2013 at 11:39
Thanks Mattias, however I temporarily wrote my own replace method and fell into another problem. Now it seems that I can't provide the backslash in any way to th web service in JSON. \\\\, %5C, \u05C and \ don't seem to be acceptable. — ArgisIsland
– ArgisIsland, Commented Jan 31, 2013 at 12:03

Bergi · Accepted Answer · 2013-01-31 12:05:09Z

7

WSParameters.replace(/\\/g, "\\\\"); should do it, and in FF18 as well. Notice that if you use JSON.stringify, this is done automatically. Also watch out that many console outputs (Firebug etc) do surround string contents with quotes, but do not escape them.

answered Jan 31, 2013 at 12:05

Bergi

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10 Comments

ArgisIsland Over a year ago

Thanks Bergi, I don't use JSON stringify, please se my EDIT 2 for the JSON WS part.

Bergi Over a year ago

However maybe you should use it for posting JSON? What is WSParameters, how do you get it?

ArgisIsland Over a year ago

The WSParameters variable is a string and looks like this: {param1: 'abc', param2: 'def', list1: ['4711','4712']}

ArgisIsland Over a year ago

I'll have a look at this, thanks. But is this also possible with dynamically generated lists and nested lists?

Bergi Over a year ago

Yes. Use an object, and JSON.stringify (like here).

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