JavaScript - Javascript Array (object)?

I have an array of objects that I would like to sort through and "join" objects that are the same. And if they are the same, I need to sum up the number value given for those two items.

So I guess Im sorting through and maybe even recreating this array to get rid of duplicates while I tally quantities.

Please see the screenshot of my array of objects to help understand better. The highlighted 'sPSPN' would indicate that it is a duplicate item and its 'fUnits' need to be totalled.

in the end I would have a total of 3 objects, because 'sPSPN'= BT-221-44 would now be only one object with 'fUnits' = 35.

Thanks!

Hi all,

I'm wondering if what I'm trying to do here is even possible but I'd appreciate your thoughts on it.

Code:

<script type="text/javascript">

	function test() {
		var arrays = {
			one: ['1', '2', '3'],
			two: ['a', 'b', 'c']
		}
		
		var foo = 'one';
		alert(arrays.(foo));
	}

	test();
</script>

I've tried numerous variations of the alert line with evals, brackets and jQuery syntax but always seem to get the error:

Code:

XML filter is applied to non-XML value ({one:["1", "2", "3"], two:["a", "b", "c"]})

Which makes me think I'm either attempting something stupid or only missing my target slightly.

The code will be running within a jQuery project up if that helps in any way.

Hi I need help with spawning in my game.

I have this code:

Code:

function spawnEnemy()
{
    var shapes = [LeftBlock, RightBlock, middleRightBlock, middleLeftBlock, middleBlock];
    var shape = shapes[Math.floor(Math.random() * shapes.length)];
    var RandomBlock = new THREE.Object3D();
    RandomBlock.add(shape);
    blocks.push(RandomBlock);

     for (var i = 0; i < blocks.length; i++) {
        RandomBlock = blocks[i];
        scene.add(RandomBlock);
        hit = false; 
        
     }

}


function startSpawningEnemies()
{

  repeater = setInterval(function() {
      spawnEnemy();
      newBlock = false;
  }, 1000);


}

Basically it chooses a random object in the array 'shapes' and it adds the shape to the scene every second.

But the problem is that when I have, for example a 'Leftblock' on screen and it randomly gets called again, Leftblock will get reset to the starting position, so basically I cant have 2 of the same type of block on screen at once.

So I want want every block in the array to be an entirely new instance of a block, rather than the same.

Here is a code pen so you can see what is happening My Codepen

Thanks in advance





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01-31-2015, 12:06 PM #2
Lesshardtofind View Profile View Forum Posts Visit Homepage

New Coder Join Date Sep 2013 Location Houston Posts 20 Thanks 0 Thanked 4 Times in 4 Posts

Hey I apologize in advance this will probably be a long post, but to get to the root of your problem it takes a bit of explaining to show how I fixed it. If you don't want to read about all the changes and why I did them if you scroll to the bottom of this post the last code snippet is the new working code.

Firstly I'd like to make a few comments.
1. Try to avoid using so many globals that is what is confusing the whole thing.
2. Even though JavaScript isn't a classical language. Using some OOP approaches can simplify your code quite a bit.

Now to what your actual problem was. You only had one instance of meshes for each type of block/paddle or whatever you call it. Even though you created new 3d objects you still were just passing it the values of the current existing Meshes.

In order to get around this I simplified your code a lot. I removed around 200 lines of code and created a few objects to make things easier. I don't know that I can explain every single thing I did, but creating objects is very useful for instance instead of making a ton of variables for each box you can make an Object called Box and then create a new instance of it. Since your Box also needs a mesh you can create that inside of the box as well.

Code:

function Box(w, h, d, q, m){
    var CoreInfo = {
        width: w,
        height: h,
        depth: d,
        quality: q,
        material: m
    };
    var Mesh = GetNewMesh(CoreInfo);
    this.setMeshY = function(y){
        Mesh.position.y = y;
    }
    this.setMeshX = function(x){
        Mesh.position.x = x;
    }
    this.getCoreInfo = function(key){
        return CoreInfo[key];
    }
    this.setCoreInfo = function(key, val){
        CoreInfo[key] = val;
    }
    this.getAllInfo = function(){
        return CoreInfo;
    }
    this.getMesh = function(){
        return Mesh;
    }
    this.setShadows = function(r, c){
        Mesh.receiveShadow = r;
        Mesh.castShadow = c;
    }
}
// you will notice that it calls this to get a MESH instead of using 5+ serperate calls you can now wrap it into a function that takes an assoc array.
function GetNewMesh(info){
    var Q = info["qaulity"];
    return new THREE.Mesh(
        new THREE.BoxGeometry(
            info["width"],
            info["height"],
            info["depth"],
            Q, Q, Q),
        info["material"]);
}

With this object you can create new instances of boxes just by passing all the variables it needs and save it into a new object.
example use:

Code:

var BlockMat = new THREE.MeshLambertMaterial({color: 0x3c00ff});
var Abox = new Box(10, 160, 10, 1, BlockMat);

As you can see the Box requires 5 arguments to construct. They are width, height, depth, quality, and material;
You will also notice there are functions inside of the Box to call functionality they are
setMeshY(y): This sets the Y position of the mesh as the y value passed to it;
setMeshX(x): This sets the X position of the mesh as the x value passed to it;
getCoreInfo(key): This gets some CoreInfo based on a string or "key" that you pass it. EX use Box.getCoreInfo("width");
setCoreInfo(key, value): This sets some CoreInfo based on a string or "key" that you pass it. EX use Box.setCoreInfo("width", 100);
getAllInfo(): Returns ALL CoreInfo in an assoc array that is accessed by a "key." EX use var AllInfo = Box.getAllInfo(); AllInfo["width"];
getMesh: Returns The mesh object
setShadows: Allows you to set shadows by passing true or false for the receive and cast arguments.

Now some of your enemy boxes needed two boxes so I further created a object called Double Box;

These are very much the same as a box. Just all methods need to be passed an index as well. These are identical to your original objects as Paddle1 is now at index 0, and Paddle2 is at index1 for each respective object.

With those objects created we can Delete a TON of your global variables and clean some stuff up. As a matter of fact the more I looked at it you didn't even NEED globals for your set enemy paddle types at all. I was able to wrap them all up into a function that will return an object like you wanted by being passed a string.

Code:

function GetBlock(type){
    if(type == "m"){
        var temp = new DoubleBox(10, 75, 10, 1, BlockMat, 10, 75, 10, 1, BlockMat);
        var obj = new THREE.Object3D();
        obj.add(temp.getMesh(0));
        obj.add(temp.getMesh(1))
        temp.setMeshX(0, fieldWidth/2);
        temp.setMeshY(0, -60);
        temp.setMeshX(1, fieldWidth/2);
        temp.setMeshY(1, 60);
        return obj;
    }
    else if(type == "mr"){
        var temp = new DoubleBox(10, 30, 10, 1,BlockMat, 10, 110, 10, 1,BlockMat);
        var obj = new THREE.Object3D();
        obj.add(temp.getMesh(0));
        obj.add(temp.getMesh(1));
        temp.setMeshX(0, fieldWidth/2);
        temp.setMeshY(0, -80);
        temp.setMeshX(1, fieldWidth/2);
        temp.setMeshY(1, 40);
        return obj;
    }
    else if(type == "ml"){
        var temp = new DoubleBox(10, 30, 10, 1, BlockMat, 10, 110, 10, 1, BlockMat);
        var obj = new THREE.Object3D();
        obj.add(temp.getMesh(0));
        obj.add(temp.getMesh(1));
        temp.setMeshX(0, fieldWidth/2);
        temp.setMeshY(0, 80);
        temp.setMeshX(1, fieldWidth/2);
        temp.setMeshY(1, -40);
        return obj;
    }
    else if(type == "l"){
        var temp = new Box(10, 160, 10, 1, BlockMat);
        var obj = new THREE.Object3D();
        obj.add(temp.getMesh());
        temp.setMeshX(fieldWidth/2);
        temp.setMeshY(20);
        return obj;
    }
    else if(type == "r"){
        var temp = new Box(10, 160, 10, 1, BlockMat);
        var obj = new THREE.Object3D();
        obj.add(temp.getMesh());
        temp.setMeshX(fieldWidth/2);
        temp.setMeshY(-20);
        return obj;
    }
}

While this could be cleaned up and do some extra error checking it now does EXACTLY what you need it to. You can call this function and pass it a string for each type of block you want. It will return a NEW instance of that type of block without sharing meshes as you had previously programmed it to.

now you can call this function in the spawn enemy function
Code:

function spawnEnemy() //total enemies starts at 0 and every-time you add to array
{
    var shapes = ["l", "r", "mr", "ml", "m"];  // these are the strings that pass to the GetBlock(type) function as type
    var shape = shapes[Math.floor(Math.random() * shapes.length)];
    blocks.push(new THREE.Object3D().add(GetBlock(shape))); // now you just pass the function to the THREE.Object3d().add() accepting shape as a parameter.

    for (var i = 0; i < blocks.length; i++) {
        RandomBlock = blocks[i];
        scene.add(RandomBlock);
        hit = false;
    }

}

I know I made a lot of changes and there are still plenty more that could reduce your code even further, but when I finally got to a point where it was working the way you wanted to I figured I'd hand it back over to you.

HERE is the final code that works if you want to copy paste it over to test it.

Code:

//scene object variables
var renderer, scene, camera, pointLight, spotLight;

var hit;
var newBlock = false;
//field variables
var fieldWidth = 500, fieldHeight = 200;

function GetNewMesh(info){
    var Q = info["qaulity"];
    return new THREE.Mesh(
        new THREE.BoxGeometry(
            info["width"],
            info["height"],
            info["depth"],
            Q, Q, Q),
        info["material"]);
}

function Box(w, h, d, q, m){
    var CoreInfo = {
        width: w,
        height: h,
        depth: d,
        quality: q,
        material: m
    };
    var Mesh = GetNewMesh(CoreInfo);
    this.setMeshY = function(y){
        Mesh.position.y = y;
    }
    this.setMeshX = function(x){
        Mesh.position.x = x;
    }
    this.getCoreInfo = function(key){
        return CoreInfo[key];
    }
    this.setCoreInfo = function(key, val){
        CoreInfo[key] = val;
    }
    this.getAllInfo = function(){
        return CoreInfo;
    }
    this.getMesh = function(){
        return Mesh;
    }
    this.setShadows = function(r, c){
        Mesh.receiveShadow = r;
        Mesh.castShadow = c;
    }
}

function DoubleBox(B1w, B1h, B1d, B1q, B1m, B2w, B2h, B2d, B2q, B2m) {
    var Boxes = [];
    Boxes[0] = new Box(B1w, B1h, B1d, B1q, B1m);
    Boxes[1] = new Box(B2w, B2h, B2d, B2q, B2m);
    this.setMeshY = function (index, y) {
        Boxes[index].setMeshY(y);
    }
    this.setMeshX = function (index, x) {
        Boxes[index].setMeshX(x);
    }
    this.getCoreInfo = function (index, key) {
        return Boxes[index].getCoreInfo(key);
    }
    this.setCoreInfo = function (index, key, val) {
        Boxes[index].setCoreInfo(key, val);
    }
    this.getAllInfo = function (index) {
        return Boxes[index].getAllInfo();
    }
    this.getMesh = function (index) {
        return Boxes[index].getMesh();
    }
    this.setShadows = function (index, r, c) {
        Boxes[index].setShadows(r, c);
    }
}

var BlockMat = new THREE.MeshLambertMaterial({color: 0x3c00ff});

var Player = new Box(10, 30, 10, 1, new THREE.MeshLambertMaterial({color: 0x4AA02C}));
function GetBlock(type){
    if(type == "m"){
        var temp = new DoubleBox(10, 75, 10, 1, BlockMat, 10, 75, 10, 1, BlockMat);
        var obj = new THREE.Object3D();
        obj.add(temp.getMesh(0));
        obj.add(temp.getMesh(1))
        temp.setMeshX(0, fieldWidth/2);
        temp.setMeshY(0, -60);
        temp.setMeshX(1, fieldWidth/2);
        temp.setMeshY(1, 60);
        return obj;
    }
    else if(type == "mr"){
        var temp = new DoubleBox(10, 30, 10, 1,BlockMat, 10, 110, 10, 1,BlockMat);
        var obj = new THREE.Object3D();
        obj.add(temp.getMesh(0));
        obj.add(temp.getMesh(1));
        temp.setMeshX(0, fieldWidth/2);
        temp.setMeshY(0, -80);
        temp.setMeshX(1, fieldWidth/2);
        temp.setMeshY(1, 40);
        return obj;
    }
    else if(type == "ml"){
        var temp = new DoubleBox(10, 30, 10, 1, BlockMat, 10, 110, 10, 1, BlockMat);
        var obj = new THREE.Object3D();
        obj.add(temp.getMesh(0));
        obj.add(temp.getMesh(1));
        temp.setMeshX(0, fieldWidth/2);
        temp.setMeshY(0, 80);
        temp.setMeshX(1, fieldWidth/2);
        temp.setMeshY(1, -40);
        return obj;
    }
    else if(type == "l"){
        var temp = new Box(10, 160, 10, 1, BlockMat);
        var obj = new THREE.Object3D();
        obj.add(temp.getMesh());
        temp.setMeshX(fieldWidth/2);
        temp.setMeshY(20);
        return obj;
    }
    else if(type == "r"){
        var temp = new Box(10, 160, 10, 1, BlockMat);
        var obj = new THREE.Object3D();
        obj.add(temp.getMesh());
        temp.setMeshX(fieldWidth/2);
        temp.setMeshY(-20);
        return obj;
    }
}

//ball variables
var reftBlock, lightBlock, middleRightBlock, middleLeftBlock, middleBlock, RandomBlock;

//game-related variables
var score = 0;

var repeater;
var blocks = [];

var collidableMeshList = [];

function setup()
{
//	update the board to reflect the max score for match win
    document.getElementById("winnerBoard").innerHTML = "Move in the gaps!";

//	set up all the 3D objects in the scene
    createScene();

//	and let's get cracking!
    draw();
}

function createScene()
{
//	set the scene size
    var WIDTH = 640,
        HEIGHT = 360;

//	set some camera attributes
    var VIEW_ANGLE = 50,
        ASPECT = WIDTH / HEIGHT,
        NEAR = 0.1,
        FAR = 10000;

    var c = document.getElementById("gameCanvas");

//	create a WebGL renderer, camera
//	and a scene
    renderer = new THREE.WebGLRenderer({antialias:true});
    renderer.setClearColorHex(0xffffff);

    camera =
        new THREE.PerspectiveCamera(
            VIEW_ANGLE,
            ASPECT,
            NEAR,
            FAR);

    scene = new THREE.Scene();

//	add the camera to the scene
    scene.add(camera);

//	set a default position for the camera
//	not doing this somehow messes up shadow rendering
    //camera.position.z = 320;

//	start the renderer
    renderer.setSize(WIDTH, HEIGHT);

//	attach the render-supplied DOM element
    c.appendChild(renderer.domElement);

//	set up the playing surface plane
    var planeWidth = fieldWidth,
        planeHeight = fieldHeight,
        planeQuality = 10;

//	create the plane's material
    var planeMaterial =
        new THREE.MeshLambertMaterial(
            {
                color: 0xffffff
            });
//	create the table's material
    var tableMaterial =
        new THREE.MeshLambertMaterial(
            {
                color: 0x3c00ff
            });
//	create the ground's material
    var groundMaterial =
        new THREE.MeshLambertMaterial(
            {
                color: 0xffffff
            });


//	create the playing surface plane
    var plane = new THREE.Mesh(

        new THREE.PlaneGeometry(
            planeWidth * 1.25,	// 95% of table width, since we want to show where the ball goes out-of-bounds
            planeHeight,
            planeQuality,
            planeQuality),

        planeMaterial);

    scene.add(plane);
    plane.receiveShadow = true;

    var table = new THREE.Mesh(

        new THREE.BoxGeometry(
            planeWidth * 1.15,	// this creates the feel of a billiards table, with a lining
            planeHeight * 1.04,
            100,	// an arbitrary depth, the camera can't see much of it anyway
            planeQuality,
            planeQuality,
            1),

        tableMaterial);
    table.position.z = -51;	// we sink the table into the ground by 50 units. The extra 1 is so the plane can be seen
    scene.add(table);
    table.receiveShadow = true;

    scene.add(Player.getMesh());
    startSpawningEnemies();


    Player.setShadows(true, true)

    /*collidableMeshList.push(MiddleBlock.getMesh(0), MiddleBlock.getMesh(1),
        MiddleLeftBlock.getMesh(0), MiddleLeftBlock.getMesh(1), MiddleRightBlock.getMesh(0),
        MiddleRightBlock.getMesh(1), RightBlock.getMesh(), LeftBlock.getMesh());*/


//	set paddles on each side of the table
    Player.setMeshX(-fieldWidth/2 + Player.getCoreInfo("width"));

    //collidableMeshList.push(RandomBlock);

//	finally we finish by adding a ground plane
//	to show off pretty shadows
    var ground = new THREE.Mesh(

        new THREE.BoxGeometry(
            1000,
            1000,
            3,
            1,
            1,
            1 ),

        groundMaterial);
    // set ground to arbitrary z position to best show off shadowing
    ground.position.z = -132;
    ground.receiveShadow = true;
    scene.add(ground);

//	// create a point light
    pointLight =
        new THREE.PointLight(0xffffff);

//	set its position
    pointLight.position.x = -1000;
    pointLight.position.y = 0;
    pointLight.position.z = 1000;
    pointLight.intensity = 2.9;
    pointLight.distance = 10000;
//	add to the scene
    scene.add(pointLight);

//	add a spot light
//	this is important for casting shadows
    spotLight = new THREE.SpotLight(0xffffff);
    spotLight.position.set(0, 0, 460);
    spotLight.intensity = 1.5;
    spotLight.castShadow = true;
    scene.add(spotLight);

//	MAGIC SHADOW CREATOR DELUXE EDITION with Lights PackTM DLC
    renderer.shadowMapEnabled = true;


}

function draw()
{
//	draw THREE.JS scene
    renderer.render(scene, camera);
//	loop draw function call
    requestAnimationFrame(draw);

    cameraPhysics();
    playerPaddleMovement();
    enemyPaddleMovement();
    collision();
    //addScore();
}

function addScore()
{
   if (RandomBlock.position.x < Pad.getMesh().position.x*2 && newBlock == false) {
        console.log("pass");
        newBlock = true;
        if (hit == false) {
            score++;
        }
        else {
            score--
        }
        document.getElementById("scores").innerHTML = score;
    }
}

function enemyPaddleMovement()
{
    if(score < 10)
    {
        for (var i = 0; i < blocks.length; i++) {

            blocks[i].position.x -= 3;
        }
    }

    if(score >= 10)
    {
        for (var i = 0; i < blocks.length; i++) {

            blocks[i].position.x -= 5;
        }

    }

}


function playerPaddleMovement()
{
    if (Key.isDown(Key.D))
        Player.setMeshY(80);
    else if (Key.isDown(Key.F))
        Player.setMeshY(40);
    else if (Key.isDown(Key.H))
        Player.setMeshY(0);
    else if (Key.isDown(Key.J))
        Player.setMeshY(-40);
    else if (Key.isDown(Key.K))
        Player.setMeshY(-80);
}

//Handles camera and lighting logic
function cameraPhysics()
{

//	move to behind the player's paddle
    camera.position.x = Player.getMesh().position.x - 100;
    camera.position.y += (Player.getMesh().position.y - camera.position.y) * 0.05;
    camera.position.z = Player.getMesh().position.z + 100 + 0.04 * (Player.getMesh().position.x);

//	rotate to face towards the opponent
    camera.rotation.y = -60 * Math.PI/180;
    camera.rotation.z = -90 * Math.PI/180;
}

//Handles paddle collision logic
function collision()
{
    var originPoint = Player.getMesh().position.clone();

    for (var vertexIndex = 0; vertexIndex < Player.getMesh().geometry.vertices.length; vertexIndex++)
    {

        var ray = new THREE.Raycaster( originPoint, Player.getMesh().geometry.vertices[vertexIndex] );
        var collisionResults = ray.intersectObjects( collidableMeshList );
        if ( collisionResults.length > 0)
        {
            console.log("true");
            hit = true;
        }
    }
}


function resetBall()
{

}

//checks if either player or opponent has reached 7 points
function matchScoreCheck()
{

}

function spawnEnemy() //total enemies starts at 0 and every-time you add to array
{
    var shapes = ["l", "r", "mr", "ml", "m"];
    var shape = shapes[Math.floor(Math.random() * shapes.length)];
    blocks.push(new THREE.Object3D().add(GetBlock(shape)));

    for (var i = 0; i < blocks.length; i++) {
        RandomBlock = blocks[i];
        scene.add(RandomBlock);
        hit = false;
    }

}


function startSpawningEnemies()
{

    repeater = setInterval(function() {
        spawnEnemy();
        newBlock = false;
    }, 1000); //this calls spawnEnemy every spawnRate
    /////////spawn 'spawnAmount' enemies every 2 seconds

}

I also commented out your addScore() function because it references RandomBlock which is not defined in its scope and the error message was annoying for debugging. I also commented out the collision as you will need to think of a new method for doing that. Most likely just build a function that accepts an array and then just pass it your blocks array and let it loop through it.

Overall cool game good luck to ya. Don't hesitate to reach out if you have any other questions.





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Users who have thanked Lesshardtofind for this post: TeaAnyOne (01-31-2015)



01-31-2015, 02:31 PM #3
TeaAnyOne View Profile View Forum Posts

New to the CF scene Join Date Jan 2015 Posts 4 Thanks 2 Thanked 0 Times in 0 Posts

Wow! I didn't expect such a huge reply, it seems that my original code has changed a lot and I will have to give it a hard look through it to understand it.

I will contact you if I have any questions, I have a lot of work ahead of me.

Thanks a lot





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01-31-2015, 04:45 PM #4
TeaAnyOne View Profile View Forum Posts

New to the CF scene Join Date Jan 2015 Posts 4 Thanks 2 Thanked 0 Times in 0 Posts

I suppose I do have one more question.

How do I get the position.x of the Randomblocks. I tried using a for loop like this:

for (var i = 0; i < blocks.length; i++) {
if (blocks[i].position.x === Player.getMesh().position.x*2 && newBlock === false) {
console.log("pass");
newBlock = true;
if (hit === false) {
score++;
}
else {
score--;
}
}

document.getElementById("scores").innerHTML = score;
}
}

it works but it seems kind of buggy as it stops counting to 10 when it changes speed.

Is there another way to retrieve the position?





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01-31-2015, 07:43 PM #5
Lesshardtofind View Profile View Forum Posts Visit Homepage

New Coder Join Date Sep 2013 Location Houston Posts 20 Thanks 0 Thanked 4 Times in 4 Posts

That should work for getting the position since the Blocks are objects of type THREE.Object3d so any methods they have should work for you.

You may be having problems because you never despawn enemies ultimately getting a huge number of 3d objects in your array blocks, or you may find your position requirement doesn't mathematically work with your speed up.

Sometimes just using a few extra console.logs to track your numbers inside of functions that don't seem to be working can help you to get an idea of what values it is seeing for the numbers and when. It might make the problem super obvious. This more like shotgun debugging which is discouraged by many, but I found it to help a lot when I was first learning code. Ultimately you want to understand your logic in each function and how it can fail when you program it, and then use error checking to make sure no parameters get outside of your allowed variance.





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Users who have thanked Lesshardtofind for this post: TeaAnyOne (01-31-2015)



01-31-2015, 08:27 PM #6
TeaAnyOne View Profile View Forum Posts

New to the CF scene Join Date Jan 2015 Posts 4 Thanks 2 Thanked 0 Times in 0 Posts

OK ill see if I can get it working.

Thanks for all your help! It helped me a lot.





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01-31-2015, 08:31 PM #7
Old Pedant View Profile View Forum Posts

Supreme Master coder! Join Date Feb 2009 Posts 28,310 Thanks 82 Thanked 4,754 Times in 4,716 Posts


Originally Posted by Lesshardtofind
Ultimately you want to understand your logic in each function and how it can fail when you program it, and then use error checking to make sure no parameters get outside of your allowed variance.



Very well said!

The following code snippet:
(this.inputArray is already defined and initialized prior to this code sequence)
if(this.inputArray.length >= 0)
{
this.inputArray[this.inputArray.length] = new Object();
this.inputArray[this.inputArray.length].type = 'pcDisp';
this.inputArray[this.inputArray.length].data = a;
}
the first line in the code block should create a new array item and initialize
it with the various assigments in the next lines.
But Firefox complains
"this.inputArray[this.inputArray.length] is not defined".
This is very disconcerting because the code has to create array items
with different data based on conditionals. So I must be able to automatically create new items as necessary. I thought that javascript had 'late binding', but maybe that doesn't apply here.

So, does anyone have a clue for me?

I have an array "arr" that is an array of objects. Each object has the same 7 properties.

I want to find the index of the object with a property that matches a certain value x in the array arr. How can i accomplish this?

The array has hash tables associated with it.

arr [ obj [ i ] . property1 + "_" + obj [ i ] . property2 ] = arr [ i ] ;

so whats the index of the object where .property1 = x ?

Thanks, g

Hello All,

I have a string array in a class file that contains 5 values, which I need to display on the jsp page.

but when I send it to the javascript it prints [Ljava.lang.String;@104f8b8 .

what do i do about it. I am a new to javascript.

Is there a way to get my array data from the response object.

Please help.

How can i display a javascript object having
[CODE]var myVarr = [{"name":"xyz","age":21},
{"name":"cde","age":25}].[CODE]
in a table in jsp page?




Regards,
Anas

I am rather new to javascript programming and not sure if this is the best approach to handle a problem.
In setting up a simple image display that can later be modified to a rotator, I am using the following code

window.document.display1.src = image1.src;

now the question is when modifying that to be more dynamic, where display1,display2,.. can refer to a different image (or set).


var Image = "image";
var Display = "display";
for (i=1; i<n; i++){
window.document.this[Display+i].src = this[Image+i].src;
}
I know the right hand side of the equation is working (alert() displays the right soure), but the problem is the left hand side. I guess because of me not fully understanding the way objects work. why this[] works on the right and not on the left? and how do I resolve it?
All your comments, and a push in right direction are appreciated.

I am doing my homework for my class, and I don't usually ask for this much help because I get most of them done by myself. However, I am having a really hard time to understand this time. I have lots lots of questions...I tried to follow the instructions that I got from my professor, but it seems not clear enough to me...
If anyone can fix or add on my codes, I will be really really appreciated....and here is the instructions and my codes..

If the form validates, instead of returning true, call the GetValues() function followed by the DisplayOutput() function.
so, I changed result true to calling functions like this,
Code:

if (blnError == true){
	return false;
	}  
	else {
	   DisplayOutput();
	   GetValues();
	}

In the .js file, create a PortraitOrder class using the following specifications
Properties: portrait, copies, size, buyer
Method: CalculateCost () -- determines the size (radio buttons) and then mutiplies the related cost by the number of copies
Code:

function PortraitOrder(){
	var cost;
	this.copies = "";
	this.portrait = "";
	this.size = "";
	this.buyer = "";
	var CalculateCost = {
    	   met1 : function () {
		if(size == 0){
		   cost = this.copies * 10
    		}
		else if(size ==1){
		   cost = this.copies * 20
		}
		else if(size ==2){
		   cost = this.copies * 10
		}
		else if(size ==3){
		   cost = this.copies * 30
		}
		else{
		   cost = this.copies * 20
		}
	   }
	}	   	
}

Create a new instance of the class named portraits as a global variable in the ,js file -" I don't see why I need this. So I did not create
Create a GetValues() function that will
retrieve the values from the form fields (document.forms[0].element.value) and assign them the properties of the instance of the PortraitOrder class.
use a for loop to retrieve the value from the radio buttons
use the prototype property to add a new property named email to the instance of the class
retrieve the value from the form field and assign it to the new email property
Code:

function GetValue(){
	this.copies = document.forms[0].Copies.value;
	this.buyer = document.forms[0].Buyer.value;
	var file = document.getElementsByName('Filename');
	for(var i = 0; i < file.length; i++){
    	if(file[i].checked){
       	 this.portrait = file[i].value;
    	}
	}
	
	var sizes = document.getElementsByName('Size');
	for(var i = 0; i < sizes.length; i++){
    	if(sizes[i].checked){
       	  this.size = sizes[i].value;
    	}
	}

	GetValue.prototype.email = document.forms[0].Email.value;
}

Create a DisplayOutput() function that
calls the CalculateCost () method for the current instance of the class.
displays the image using the value from the portrait property which contains the filename. Be sure to include height and width (and that would be why all of the images had to be the same dimension. These values can be hardcoded. The filename, however, may NOT be hard coded.. it must use the object.property format.
displays the buyer, email, copies, size, and cost using the object.property format (document.forms[0].element.value is not permitted)
The cost must be formatted as ##.## where # represents a number (Hint: Use a method of the Number class). It is NOT okay just to concatenate .00 to then end of the cost.
Code:

function DisplayOutput(){
	CalculateCost.met1();
	document.write("buyer: " + this.buyer);
	document.write("Email: " + email);
	document.write("Portrait: " + this.portrait);
	document.write("Copies: " + this.copies);
	document.write("Cost: " + "$"+cost.toFixed(2));
	document.write("Thank you");
}

The order form must include the site's header and footer and coordinate with the rest of the site.
There is no form processing file, everything is done in the .js file.

You may think like, this is horrible codes. And yes, it is. I know probably this is totally odd. This is why I came here for ask help. Also, I spent days to tried, but I could not get any idea...Anyone please help me on this?

I have several list items in an html document. Each list item has an anchor tag and each anchor has an 'onmouseover' event.

Is it possible to get the containing object for the event upon the mouseover?

I was going through an article on JavaScript objects on "http://www.howtocreate.co.uk/tutorials/javascript/javascriptobject" and there I read

Quote:
Intrinsic objects - variable types with constructors.

* Array
* Boolean
* Date
* Function
* Image
* Number
* Object
* Option
* Regular Expression
* String
does it mean that, whenever I want to use any of these objects, I have to create it using new and only then I can use its properties or methods ?

1) There are other objects like document, history, location, navigator, parent and screen. If objects which need to be created using constructor are called intrinsic objects , then what are other objects which can be used without constructor are called as ?

Array, Boolean, Image, Date etc all start with capital letter. While document, history, navigator etc start with lower case letter. Why is that ? Is there any difference between objects that start with upper case and those start with lower case ? Are they known by different names ?

Thanks

I'm writing a script in javascript(actually a chrome extension) and I need an object that I can write to it like this(sorry, don't know how to explain it better) and then I convert it to string with format of json.

Code:

id[129].weekDay[6].hour[23] = 0

Here, id is an array, that each element in it contain another array(weeksDay) and in that array each contain another array(hour).
The id indices are unlimited, for weekDay 7 and hour 24.

I searched in google but i couldn't find what I wanted. Actually don't know the best keyword to search.(objects in arrays?)

I don't know what exactly it is called, I can write it's declaration in VB.NET if that helps you.

Hi i am confused in one topic and need help,

I have a javascript array containing objects like;
Object values are ordered as Type, Amount and count.

Object 1 => ("A" , 100 ,10)
Object 2 => ("C" , 50 ,10)
Object 3 => ("A" , 100 ,20)
Object 4 => ("B" , 200 ,10)
Object 5 => ("A" , 10 ,10)
Object 6 => ("B" , 100 ,10)
Object 7 => ("C" , 100 ,5)
Object 8 => ("C" , 50 ,5)

In the end i want to group these objects like ;

("A" , 100,30) (Note : 30 = 20 +10)
("A" , 10,10)


("B" , 200,10)
("B" , 100,10)


("C" , 100,5)
("C" , 50,15) 15 = 10 + 5


How can i do this in javascript, note that the new types will be added to this array ?

Hi all,

Have problem from getting data of JavaScript Object ie. Associative Array.

Code:

var a, table1
a = new ActiveXObject("MyProgID");  a.GetDataFromExcel("C:\\Users\\myFolder\\Desktop\\test.xls","Sheet1")
a.Generate()  
table1 = a.writeInTable();

Here writeInTable function returns a 2D Object array from DLL written in VB.Net. So I got the Object to table1.
But from table1, I can't access the values but its there. table1 shows values as in this image(Image Attached.)



Actually, I tried many ways like
tab(0)(0)
tab[0][0]
tab["0"]
tab.(0).(0)
tab.[0].[0]
Also with toArray(), (new VBArray(tab)).toArray()....


I don't know what I am wrong..Can anyone help me on this?

Thanks...
Shanmugavel.C

Hi,

I'm looking for some help, or perhaps an explaination in regards to "click & rotate" an image using your cursor with Javascript. I've seen this a couple of times on various websites and I'm wondering how difficult/expensive it is to develop such an image.

I own a clothing company and what I'm looking to do is to create images on my website of a product in which the customer can click on and "rotate" to see a 360 degree view of the product. Think autocad to a degree...

Is Javascript the best language to pursue for this function? I'm quite new to this department, so any help/advice is greatly appreciated.