Get Attribute From Multiple Div Elements into my iOS app from UIWebView W/Swift
Question
How do I get an attribute from a div element defined in my UIWebView into my iOS app?
To explain further...
I have a very simple html document that I load into a UIWebView. It allows a user to click to turn buttons on or off. I set an attribute on the divs to true or false. Refer to my code below.
<html>
<head>
<title>Tire Selection Template</title>
<style>
.front_truck_box{
display:flex;
flex-wrap: wrap;
border:1px solid black;
height:80px;
flex: 0 1 80px;
padding:10px;
}
.middle_truck_box, .back_truck_box {
display:flex;
flex-wrap: wrap;
border:1px solid black;
height:80px;
flex: 1 1 120px;
max-width:250px;
padding:10px;
}
.wrapper{
display:flex;
flex-direction: row;
flex-wrap: nowrap;
align-items:center;
justify-content: center;
}
.tire_box{
flex: 0 0 10px;
height:30px;
width:10px;
border:1px solid black;
cursor:pointer;
}
.tire_set{
display: flex;
flex: 0 0 35px;
justify-content: space-around;
}
.front_tire_set{
display:flex;
flex: 0 1 100%;
justify-content: space-around;
}
.first_row,.second_row{
display:flex;
flex: 1 0 100%;
flex-direction: row;
flex-wrap: wrap;
align-items: center;
justify-content: space-around;
}
</style>
</head>
<body>
<div class="wrapper">
<div class="front_truck_box">
<div class="first_row">
<div class="front_tire_set">
<div class="tire_box" tire="1" active="false"></div>
<div class="tire_box" tire="2" active="false"></div>
</div>
</div>
<div class="second_row">
<div class="front_tire_set">
<div class="tire_box" tire="3" active="false"></div>
<div class="tire_box" tire="4" active="false"></div>
</div>
</div>
</div>
<div class="middle_truck_box">
<div class="first_row">
<div class="tire_set">
<div class="tire_box" tire="5" active="false"></div>
<div class="tire_box" tire="6" active="false"></div>
</div>
<div class="tire_set">
<div class="tire_box" tire="7" active="false"></div>
<div class="tire_box" tire="8" active="false"></div>
</div>
</div>
<div class="second_row">
<div class="tire_set">
<div class="tire_box" tire="9" active="false"></div>
<div class="tire_box" tire="10" active="false"></div>
</div>
<div class="tire_set">
<div class="tire_box" tire="11" active="false"></div>
<div class="tire_box" tire="12" active="false"></div>
</div>
</div>
</div>
<div class="back_truck_box">
<div class="first_row">
<div class="tire_set">
<div class="tire_box" tire="13" active="false"></div>
<div class="tire_box" tire="14" active="false"></div>
</div>
<div class="tire_set">
<div class="tire_box" tire="15" active="false"></div>
<div class="tire_box" tire="16" active="false"></div>
</div>
</div>
<div class="second_row">
<div class="tire_set">
<div class="tire_box" tire="17" active="false"></div>
<div class="tire_box" tire="18" active="false"></div>
</div>
<div class="tire_set">
<div class="tire_box" tire="19" active="false"></div>
<div class="tire_box" tire="20" active="false"></div>
</div>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-2.2.3.min.js" integrity="sha256-a23g1Nt4dtEYOj7bR+vTu7+T8VP13humZFBJNIYoEJo=" crossorigin="anonymous"></script>
<script>
$(document).ready(function(){
$(".wrapper").on('click', '.tire_box', function() {
var tire = $(this).attr("tire");
var active = $(this).attr("active");
console.log(active);
//console.log(tire);
if( active == "false"){
$(this).css("background-color","black");
$(this).attr("active","true");
}else{
$(this).css("background-color","white");
$(this).attr("active","false");
}
});
function test(){
return "test"
}
});
</script>
</body>
</html>
You can see it in action here: https://jsfiddle.net/x11joex11/0d92ao80/1/
I'm aware of the the following line of code in swift.
theWebView.stringByEvaluatingJavaScriptFromString("document.documentElement.outerHTML")
This line will return ALL the HTML. Now I could go through this perhaps and parse, but I'm thinking it should be possible since I'm using jquery to run a command to get all the boxes that were clicked. When each box is clicked I change its 'active' attribute to "true" or "false". How do I do this?
For example returning an array with values of the "tire" attribute I have on each div (.tire_box) that is clicked ( "active=true" ).
An answer using jQuery (since I have it on my HTML) or Javascript is ok. Just not sure what to put in the stringByEvaluatingJavascriptFromString() function
Update::
I was able to get the value from 'one' of the tires with this command.
document.getElementsByClassName('tire_box')[0].getAttribute('tire')
I need to be able to get the list of tires selected and do something with it in swift somehow. Not sure best way to do this yet...
Whats interesting is I seem to be able to run jQuery code. I created a function test() in a variable outside javascript with an alert('test') in it in my html and ran this code...
Swift Javascript I ran
$(document).ready(function(){
test();
});
Added to HTML outside document.ready()
var test = function(){
alert("test function ran");
return "test";
};
on the stringByEvaluatingJavaScriptFromString function and it called the alert but I don't seem to get any result back from the stringByEvaluatingJavaScriptFromString function...just blank?
I wonder just 'how' the function returns the javascript and what do I have to do in the javascript command to make it return something?
1 answers
solution1
0 ACCPTED 2016-04-25 22:52:42
After much research I finally figured out the answer. Turns out that stringByEvaluatingJavaScriptFromString will return the result of the LAST statement to be run.
That said I modified my html the following below.
<html>
<head>
<title>Tire Selection Template</title>
<style>
.front_truck_box{
display:flex;
flex-wrap: wrap;
border:1px solid black;
height:80px;
flex: 0 1 80px;
padding:10px;
}
.middle_truck_box, .back_truck_box {
display:flex;
flex-wrap: wrap;
border:1px solid black;
height:80px;
flex: 1 1 120px;
max-width:250px;
padding:10px;
}
.wrapper{
display:flex;
flex-direction: row;
flex-wrap: nowrap;
align-items:center;
justify-content: center;
}
.tire_box{
flex: 0 0 10px;
height:30px;
width:10px;
border:1px solid black;
cursor:pointer;
}
.tire_set{
display: flex;
flex: 0 0 35px;
justify-content: space-around;
}
.front_tire_set{
display:flex;
flex: 0 1 100%;
justify-content: space-around;
}
.first_row,.second_row{
display:flex;
flex: 1 0 100%;
flex-direction: row;
flex-wrap: wrap;
align-items: center;
justify-content: space-around;
}
</style>
</head>
<body>
<div class="wrapper">
<div class="front_truck_box">
<div class="first_row">
<div class="front_tire_set">
<div class="tire_box" tire="1" active="false"></div>
<div class="tire_box" tire="2" active="false"></div>
</div>
</div>
<div class="second_row">
<div class="front_tire_set">
<div class="tire_box" tire="3" active="false"></div>
<div class="tire_box" tire="4" active="false"></div>
</div>
</div>
</div>
<div class="middle_truck_box">
<div class="first_row">
<div class="tire_set">
<div class="tire_box" tire="5" active="false"></div>
<div class="tire_box" tire="6" active="false"></div>
</div>
<div class="tire_set">
<div class="tire_box" tire="7" active="false"></div>
<div class="tire_box" tire="8" active="false"></div>
</div>
</div>
<div class="second_row">
<div class="tire_set">
<div class="tire_box" tire="9" active="false"></div>
<div class="tire_box" tire="10" active="false"></div>
</div>
<div class="tire_set">
<div class="tire_box" tire="11" active="false"></div>
<div class="tire_box" tire="12" active="false"></div>
</div>
</div>
</div>
<div class="back_truck_box">
<div class="first_row">
<div class="tire_set">
<div class="tire_box" tire="13" active="false"></div>
<div class="tire_box" tire="14" active="false"></div>
</div>
<div class="tire_set">
<div class="tire_box" tire="15" active="false"></div>
<div class="tire_box" tire="16" active="false"></div>
</div>
</div>
<div class="second_row">
<div class="tire_set">
<div class="tire_box" tire="17" active="false"></div>
<div class="tire_box" tire="18" active="false"></div>
</div>
<div class="tire_set">
<div class="tire_box" tire="19" active="false"></div>
<div class="tire_box" tire="20" active="false"></div>
</div>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-2.2.3.min.js" integrity="sha256-a23g1Nt4dtEYOj7bR+vTu7+T8VP13humZFBJNIYoEJo=" crossorigin="anonymous"></script>
<script>
var returnToIOS = function(){
//Calculate which tires are 'active=true' and 'active=false' to the array.
var tires = [];
var tireObj = {};
$(".tire_box").each(function(index){
tireObj = {};//create new object.
tireObj["number"] = $(this).attr("tire");
tireObj["active"] = $(this).attr("active");
tires.push(tireObj);//add to our tire array the object.
});
var jsonString = JSON.stringify(tires);
return jsonString;
};
$(document).ready(function(){
$(".wrapper").on('click', '.tire_box', function() {
var tire = $(this).attr("tire");
var active = $(this).attr("active");
if( active == "false"){
$(this).css("background-color","black");
$(this).attr("active","true");
}else{
$(this).css("background-color","white");
$(this).attr("active","false");
}
});
});
</script>
</body>
</html>
Notice the function returnToIOS . I made it so it would return a JSON string with the data I wanted from the template.
Next in Swift I did the following code.
let javascript = "returnToIOS();"
let value = self.theWebView.stringByEvaluatingJavaScriptFromString(javascript)
This will return the JSON string with all the data!
To make this even better, I included a library into my iOS project called Swift Json ( https://github.com/dankogai/swift-json/ )
I then ran these commands.
let data = value!.dataUsingEncoding(NSUTF8StringEncoding)
let json = JSON(data:data!)
for tires in json.asArray! {
print(tires["number"].asString!+" : "+tires["active"].asString!)
}
and Wha La I had all my data in a nice array that I can manipulate with!
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