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javascript - 如何使用 document.write 函数在 printview 中动态加载图像

问题描述

我正在尝试使用document.write函数动态加载图像。请在下面找到代码。图片有时会加载，有时不显示。

    var mywindow = window.open('', 'PRINT', 'height=400,width=600');

    mywindow.document.write('<html><head><title>'+"Contract Approval Form"+'</title>');
    mywindow.document.write('</head><body >');
    mywindow.document.write('<div id="headerLogo"></div>');
    mywindow.document.write('<div id="watermarkDiv"></div>');
    mywindow.document.write('<div style="margin-top:50px;" id="content">' +printContent+ '</div>');
    var img = mywindow.document.createElement('img');
    img.setAttribute('src', 'mylogo.png');
    mywindow.document.getElementById("headerLogo").appendChild(img);
    mywindow.document.write('</body></html>');


    mywindow.document.close(); // necessary for IE >= 10
    mywindow.focus(); // necessary for IE >= 10*/

    mywindow.print();
    mywindow.close();

标签： javascriptservicenow

解决方案

这是关于等待内容加载

<script>
var printContent = '<h1>Hello World</h1>';
var mywindow = window.open('about:blank', 'PRINT', 'height=400,width=600');

//~ mywindow.onload = function() {
mywindow.document.write('<html><head><title>'+"Contract Approval Form"+'</title>');
mywindow.document.write('</head><body >');
mywindow.document.write('<div id="headerLogo"></div>');
mywindow.document.write('<div id="watermarkDiv"></div>');
mywindow.document.write('<div style="margin-top:50px;" id="content">' +printContent+ '</div>');
var img = mywindow.document.createElement('img');
img.setAttribute('src', 'mylogo.png');
img.onload = function() {
    // now you can print, need to wait for image to load - which connotes you need to work out how to wait for all content to load
    mywindow.focus();
    mywindow.print();

}

mywindow.document.getElementById("headerLogo").appendChild(img);
mywindow.document.write('</body></html>');

</script>

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