Difficulty encountered when transferring an array from Xcode to JavaScript via SBJSON

Question

Difficulty encountered when transferring an array from Xcode to JavaScript via SBJSON

In an attempt to transfer an array from Xcode to a local HTML file, I am utilizing jQuery in the HTML code. This involves using loadHTMLString: with baseURL to read both the HTML and included .js files. However, I am encountering an issue when trying to use

stringByevaluatingjavascriptfromstring

to load the webview. The specific code snippet is as follows:

NSString *java=[NSString stringWithFormat:@"javafunction('%@');",json];
[webView loadHTMLString:content baseURL:baseURL];    
[webView stringByEvaluatingJavaScriptFromString:java];

Within my HTML file, I have implemented the following function:

function javafunction(inp) {
  var arr=newArray(); 
  arr='inp'; 
  alert(arr[0]);
}

javascript iphone uiwebview

Answer 1

Answer №1

In my opinion

var array = new Array(); 
array[0] = 'inp';

should be

var arr = [inp];

using the shorter array syntax or alternatively

var arr = new Array();
arr.push('inp');

which utilizes the push method to insert the input parameter, inp, at the end of the array.

newArray will likely throw an error such as newArray is not defined, and assigning arr='inp' would replace the array with a string rather than inserting the string into the array.

UPDATE:

[NSString stringWithFormat:@"javafunction('%@');",json]

may not be suitable. If json is a JSON-encoded string, it's advisable to eliminate the single quotes. If it isn't a JSON-encoded string, consider encoding it as JSON.

This could seem minor, yet it's important to note that not all JSON strings are valid JavaScript expressions because JSON allows unicode codepoints U+2028 and U+2029 in strings while they signify a newline in JavaScript. For instance, the JavaScript expression eval(JSON.stringify("\u2028")) results in an exception.

Answer 2

In my opinion

var array = new Array(); 
array[0] = 'inp';

should be

var arr = [inp];

using the shorter array syntax or alternatively

var arr = new Array();
arr.push('inp');

which utilizes the push method to insert the input parameter, inp, at the end of the array.

newArray will likely throw an error such as newArray is not defined, and assigning arr='inp' would replace the array with a string rather than inserting the string into the array.

UPDATE:

[NSString stringWithFormat:@"javafunction('%@');",json]

may not be suitable. If json is a JSON-encoded string, it's advisable to eliminate the single quotes. If it isn't a JSON-encoded string, consider encoding it as JSON.

This could seem minor, yet it's important to note that not all JSON strings are valid JavaScript expressions because JSON allows unicode codepoints U+2028 and U+2029 in strings while they signify a newline in JavaScript. For instance, the JavaScript expression eval(JSON.stringify("\u2028")) results in an exception.

Difficulty encountered when transferring an array from Xcode to JavaScript via SBJSON

Answer №1

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