html2canvas/src/Util.js

// Simple logger
html2canvas.prototype.log = function(a){
    
    if (this.opts.logging){
        
        var logger = window.console.log || function(log){
            alert(log);
        };
    /*
        if (typeof(window.console) != "undefined" && console.log){
            console.log(a);
        }else{
            alert(a);
        }*/
    }
}                    


/**
 * Function to provide bounds for element
 * @return {Bounds} object with position and dimension information
 */
html2canvas.prototype.getBounds = function(el){
        
    window.scroll(0,0);
        
    if (el.getBoundingClientRect){	
        var bounds = el.getBoundingClientRect();	
        bounds.top = bounds.top;
        bounds.left = bounds.left;
        return bounds;
    }else{
            
        // TODO remove jQuery dependancy
        var p = $(el).offset();       
          
        return {               
            left: p.left + parseInt(this.getCSS(el,"border-left-width"),10),
            top: p.top + parseInt(this.getCSS(el,"border-top-width"),10),
            width:$(el).innerWidth(),
            height:$(el).innerHeight()                
        }

    }           
}
    
     
     
/*
 * Function for looping through array
 */
html2canvas.prototype.each = function(arrayLoop,callbackFunc){
    callbackFunc = callbackFunc || function(){};
    for (var i=0;i<arrayLoop.length;i++){       
        callbackFunc(i,arrayLoop[i]);
    }
}


/*
 * Function to get childNodes of an element in the order they should be rendered (based on z-index)
 * reference http://www.w3.org/TR/CSS21/zindex.html
 */

html2canvas.prototype.contentsInZ = function(el){
    
    // TODO remove jQuery dependency
    
    var contents = $(el).contents();
    
    return contents;
 
}

    
/*
 * Function for fetching the element attribute
 */  
html2canvas.prototype.getAttr = function(el,attribute){
    return el.getAttribute(attribute);
//return $(el).attr(attribute);
}

/*
 * Function to extend object
 */
html2canvas.prototype.extendObj = function(options,defaults){
    for (var key in options){              
        defaults[key] = options[key];
    }
    return defaults;           
}


html2canvas.prototype.leadingZero = function(num,size){
    
    var s = "000000000" + num;
    return s.substr(s.length-size);    
}    
    
html2canvas.prototype.formatZ = function(zindex,position,parentZ,parentNode){
    
    if (!parentZ){
        parentZ = "0";
    }


    if (position!="static" && parentZ.charAt(0)=="0"){
        this.needReorder = true;
        parentZ = "1"+parentZ.slice(1);        
    }

    if (zindex=="auto"){
        var parentPosition = this.getCSS(parentNode,"position");
        if (parentPosition!="static" && typeof parentPosition != "undefined"){
            zindex = 0;
        }else{
            return parentZ;
        }
    }
    
    var b = this.leadingZero(this.numDraws,9);  
    
    
    var s = this.leadingZero(zindex+1,9);

    // var s = "000000000" + num;
    return parentZ+""+""+s+""+b;
    
    
    
}
    
/*
 * Get element childNodes
 */
    
html2canvas.prototype.getContents = function(el){
    return (el.nodeName ==  "iframe" ) ?
    el.contentDocument || el.contentWindow.document :
    el.childNodes;
}

    
/*
 * Function for fetching the css attribute
 * TODO remove jQuery dependancy
 */
html2canvas.prototype.getCSS = function(el,attribute){
    return $(el).css(attribute);
}