pdf.Js預覽pdf檔案，加入動态水印，也可以用于其他類型檔案預覽添加水印功能

var _this = this;

                    if (this.renderingState !== _pdf_rendering_queue.RenderingStates.INITIAL) {
                        console.error('Must be in new state before drawing');
                        this.reset();
                    }
                    if (!this.pdfPage) {
                        this.renderingState = _pdf_rendering_queue.RenderingStates.FINISHED;
                        return Promise.reject(new Error('Page is not loaded'));
                    }
                    this.renderingState = _pdf_rendering_queue.RenderingStates.RUNNING;
                    var pdfPage = this.pdfPage;
                    var div = this.div;
                    var canvasWrapper = document.createElement('div');
                    canvasWrapper.style.width = div.style.width;
                    canvasWrapper.style.height = div.style.height;
                    canvasWrapper.classList.add('canvasWrapper');
                    if (this.annotationLayer && this.annotationLayer.div) {
                        div.insertBefore(canvasWrapper, this.annotationLayer.div);
                    } else {
                        div.appendChild(canvasWrapper);
                    }
           
var textLayer = null;

if (this.textLayerMode !== _ui_utils.TextLayerMode.DISABLE && this.textLayerFactory) {

var textLayerDiv = document.createElement('div');

textLayerDiv.className = 'textLayer';

textLayerDiv.style.width = canvasWrapper.style.width;

textLayerDiv.style.height = canvasWrapper.style.height;

//水印

var cover = document.createElement('div');

cover.className = "cover";

var defaultSettings = {

*****watermark_txt: window.parent.waterMark,

watermark_img: window.parent.img,**

watermark_x: 0,//水印起始位置x軸坐标

watermark_y: 0,//水印起始位置Y軸坐标

watermark_rows: window.parent.rows,//水印行數

watermark_cols: window.parent.cols,//水印列數

watermark_x_space: window.parent.x_space,//水印x軸間隔

watermark_y_space: window.parent.y_space,//水印y軸間隔

watermark_color: 'red',//水印字型顔色

watermark_alpha: window.parent.alpha,//水印透明度

watermark_fontsize: window.parent.fontsize,//水印字型大小

watermark_font: '微軟雅黑',//水印字型

watermark_width: window.parent.width,//水印寬度

watermark_height: window.parent.height,//水印長度

watermark_angle: window.parent.angle,//水印傾斜度數***

};

var oTemp = document.createDocumentFragment();

//擷取頁面最大寬度

var page_width = parseInt(canvasWrapper.style.width);

//擷取頁面最大長度

var page_height = parseInt(canvasWrapper.style.height);

//如果将水印列數設定為0，或水印列數設定過大，超過頁面最大寬度，則重新計算水印列數和水印x軸間隔

if (defaultSettings.watermark_cols == 0 || (parseInt(defaultSettings.watermark_x + defaultSettings.watermark_width * defaultSettings.watermark_cols + defaultSettings.watermark_x_space * (defaultSettings.watermark_cols - 1)) > page_width)) {

defaultSettings.watermark_cols = parseInt((page_width - defaultSettings.watermark_x + defaultSettings.watermark_x_space) / (defaultSettings.watermark_width + defaultSettings.watermark_x_space));

defaultSettings.watermark_x_space = parseInt((page_width - defaultSettings.watermark_x - defaultSettings.watermark_width * defaultSettings.watermark_cols) / (defaultSettings.watermark_cols - 1));

}

//如果将水印行數設定為0，或水印行數設定過大，超過頁面最大長度，則重新計算水印行數和水印y軸間隔

if (defaultSettings.watermark_rows == 0 || (parseInt(defaultSettings.watermark_y + defaultSettings.watermark_height * defaultSettings.watermark_rows + defaultSettings.watermark_y_space * (defaultSettings.watermark_rows - 1)) > page_height)) {

defaultSettings.watermark_rows = parseInt((defaultSettings.watermark_y_space + page_height - defaultSettings.watermark_y) / (defaultSettings.watermark_height + defaultSettings.watermark_y_space));

defaultSettings.watermark_y_space = parseInt(((page_height - defaultSettings.watermark_y) - defaultSettings.watermark_height * defaultSettings.watermark_rows) / (defaultSettings.watermark_rows - 1));

}

var x;

var y;

for (var i = 0; i < defaultSettings.watermark_rows; i++) {

y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;

for (var j = 0; j < defaultSettings.watermark_cols; j++) {

x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j;

var mask_div = document.createElement('div');

var mask_img = document.createElement('img');

mask_div.id = 'mask_div' + i + j;

mask_div.className = 'mask_div';

mask_img.className = 'mask_img';

mask_div.appendChild(document.createTextNode(defaultSettings.watermark_txt));

mask_img.src = defaultSettings.watermark_img;

//設定水印div傾斜顯示

if(defaultSettings.watermark_img == ""){

mask_div.remove(mask_img);

}else{

mask_div.append(mask_img);

} //注意看這裡加了圖檔水印

mask_div.style.webkitTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";

mask_div.style.MozTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";

mask_div.style.msTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";

mask_div.style.OTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";

mask_div.style.transform = "rotate(-" + defaultSettings.watermark_angle + "deg)";

mask_div.style.visibility = "";

mask_div.style.position = "absolute";

//奇偶行錯開，這樣水印就不對齊，顯的不呆闆

if (i % 2 != 0) {

mask_div.style.left = x + 100 + 'px';

} else {

mask_div.style.left = x + 'px';

}

mask_div.style.top = y + 'px';

mask_div.style.overflow = "hidden";

mask_div.style.opacity = defaultSettings.watermark_alpha;

mask_div.style.fontSize = defaultSettings.watermark_fontsize;

mask_div.style.fontFamily = defaultSettings.watermark_font;

mask_div.style.color = defaultSettings.watermark_color;

mask_div.style.textAlign = "center";

mask_div.style.width = defaultSettings.watermark_width + 'px';

mask_div.style.height = defaultSettings.watermark_width + 'px';

mask_img.style.width = defaultSettings.watermark_width + 'px';

mask_img.style.height = defaultSettings.watermark_height + 'px'; //這裡可以控制水印大小

// mask_div.style.zIndex = '-99';

mask_div.style.display = "block";

oTemp.appendChild(mask_div);

}

}

cover.appendChild(oTemp);

//這裡結束

if (this.annotationLayer && this.annotationLayer.div) {

div.insertBefore(textLayerDiv, this.annotationLayer.div);

//水印

div.appendChild(cover);

} else {

div.appendChild(textLayerDiv);

//水印

div.appendChild(cover);

}

textLayer = this.textLayerFactory.createTextLayerBuilder(textLayerDiv, this.id - 1, this.viewport, this.textLayerMode === _ui_utils.TextLayerMode.ENABLE_ENHANCE);

//水印

var cover = document.getElementsByClassName('cover');

for (var i = 0, len = cover.length; i < len; i++) {

cover[i].style.width = canvasWrapper.style.width;

cover[i].style.height = canvasWrapper.style.height;

}

}

this.textLayer = textLayer;

var renderContinueCallback = null;

在viewer.css裡面添加

.cover{
 position:absolute;
 top:0;
overflow:hidden
}

再viewer.js中添加上面代碼塊第幾行不一樣直接搜

if (this.textLayerMode !== _ui_utils.TextLayerMode.DISABLE && this.textLayerFactory) {  
不明白可後續發郵件聯系

pdf.Js預覽pdf檔案，加入動态水印，也可以用于其他類型檔案預覽添加水印功能

window.parent.xxx寫法是動态傳入水印的再前端實作js頁面用這種方法傳入值

pdf.Js預覽pdf檔案，加入動态水印，也可以用于其他類型檔案預覽添加水印功能

代碼塊中加入了圖檔水印（個人需求，有需要可以自行修改），邏輯與文字水印一直，也可以直接傳入預設值

标注顔色位置為主要控制模闆目前實作動态水印，有後續問題歡迎讨論代碼塊支援其他類型加水印，有需要可聯系我發完整js檔案 [email protected]

pdf.Js預覽pdf檔案，加入動态水印，也可以用于其他類型檔案預覽添加水印功能

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