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javascript – Android webview "Uncaught SyntaxError: Unexpected token ILLEGAL"

Posted by: admin June 15, 2020 Leave a comment


In my android program I got a webview and need to set values to the webview elements (textareas, checkboxes etc) dynamically. i have a javascript method which receives values from the program and perform string operations and stores the values to the correct element. But i get this error always… kinda stuck here. Any help will be appreciated.

I successfully executed the script in the w3schools TryIt Editor, but not working in the program!

final WebView webView = new WebView(getApplicationContext());
LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT, 1);
webView.setWebChromeClient(new android.webkit.WebChromeClient());
webView.setWebViewClient(new WebChromeClient());
webView.loadData("<!DOCTYPE html><html><body>"+ questionsArray[questionIndex] +"</body></html>", "text/html", "UTF-8");
webView.addJavascriptInterface(javaScriptInterface, "HtmlViewer");

And my Javascript method to set values for the textareas in the webView

function myFunction(var_)
    var str = var_.replace("-!!!-","");
    var pipeSplitedArray = str.split("||");

    for(var i=0; i<pipeSplitedArray.length-1; i++) {  

        if(pipeSplitedArray[i].indexOf("[email protected]!-") == -1) {

            var queArray = new Array();
            queArray =pipeSplitedArray[i].split("[email protected][email protected]");


Values are passed on onPageFinished loading..

    private class WebChromeClient extends WebViewClient {

                public boolean shouldOverrideUrlLoading(WebView view, String url) {

                     return true;

                public void onPageFinished(WebView view, String url) {

                     String script = "javascript:function myFunction(var_) { var pipeSplitedArray = var_.split(\"\|\|\"); for(var i=0; i<pipeSplitedArray.length-1; i++) {  if(pipeSplitedArray[i].indexOf(\"[email protected]!-\") == -1) { var queArray = new Array(); queArray =pipeSplitedArray[i].split(\"[email protected][email protected]\"); if(document.getElementsByName(queArray[0])) document.getElementsByName(queArray[0]).item(0).innerHTML=queArray[1]; } } }";

The HTML content loaded in the webView, questionsArray[questionIndex] is

<div class="newmain5 norma12" style="position:relative;width:320px;"> Enter your name :</div>
<div class="newmain6" style="position:relative;width:275px;left:10px;">
<textarea name="69_206"  id="1" rows="5" cols="30" style="font-family:Arial, Helvetica, sans-serif; font-size:12px; color:#666666; width:260px; border:1px solid #CCCCCC; background-color:#EBEBEB;" />

String passed on onPageFinished:

[email protected][email protected]||

The Error i get all time while running my application is

11-23 14:46:59.786: I/chromium(2763): [INFO:CONSOLE(1)] "Uncaught SyntaxError: Unexpected token ILLEGAL", source:  (1)

I tried running the script in the w3schools Tryit Editor and the script is successfully executed, but never in the android application.. whats my mistake? Would be great if you can help!!

Thanks in advance..

How to&Answers:

Found the Error. You need to put the String value in quotes while passing as parameter.





The value should be in quotes, check myFunction('[email protected][email protected]||')


Check your JavaScript file

if you have Wrong syntax of relational operator in if statement.

change => to >= and =< to <=

$('#search').bind('keydown', function() {
    tmp = Number(event.keyCode);
    if ((tmp  <= "48" && tmp  >= "90") || (tmp  <= "96" && tmp  >= "111") || (tmp  <= "186" && tmp  >= "222")) {

Other check this your code:

If you need to make sure that the string is not just a bunch of empty spaces (I’m assuming this is for form validation) you need to do a replace on the spaces.