Question

我有一个问题。在下面的代码中，当我将base64设置为src时，img.onload没有触发。但是当我将图像直接设置为src时，img.onload会被触发，而console.log会返回“image is loaded”。你能解释一下img.onload只有当它是一个图像而不是base64字符串时才会被触发的原因。另外，如何使base64字符串触发img.onload。

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>

<head>

</head>

<body style="background-color:#F5F5F6;">
</body>
<script>
    (function() {
        var b64 =
            "data:image/svg+xml;base64,<div xmlns="http://www.w3.org/1999/xhtml" id="graph0" style="width: 800px;"><div id="graph0_title" style="position: relative; display: table; margin: 0px auto; padding: 10px; font-size: 10px; font-family: Arial, Helvetica, sans-serif; font-weight: normal; font-style: normal; color: rgb(0, 0, 0);">Title</div><div id="graph0_chart" data-highcharts-chart="5" style="height: 300px;"><div id="highcharts-7p0fsh2-10" class="highcharts-container " style="position: relative; overflow: hidden; width: 800px; height: 300px; text-align: left; line-height: normal; z-index: 0; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);"><svg version="1.1" class="highcharts-root" style="font-family:&quot;Lucida Grande&quot;, &quot;Lucida Sans Unicode&quot;, Arial, Helvetica, sans-serif;font-size:12px;" xmlns="http://www.w3.org/2000/svg" width="800" height="300" viewBox="0 0 800 300"><desc>Created with Highcharts 5.0.14</desc><defs><clipPath id="highcharts-7p0fsh2-11"><rect x="0" y="0" width="780" height="275" fill="none"/></clipPath></defs><rect fill="#ffffff" class="highcharts-background" x="0" y="0" width="800" height="300" rx="0" ry="0"/><rect fill="none" class="highcharts-plot-background" x="10" y="10" width="780" height="275"/><rect fill="none" class="highcharts-plot-border" x="10" y="10" width="780" height="275"/><g class="highcharts-series-group"><g class="highcharts-series highcharts-series-0 highcharts-pie-series highcharts-color-undefined highcharts-tracker" transform="translate(10,10) scale(1 1)"><path fill="#9400D3" d="M 389.97830880380644 52.00000220895774 A 106.5 106.5 0 0 1 417.46102846472934 55.601302653243835 L 390 158.5 A 0 0 0 0 0 390 158.5 Z" transform="translate(0,0)" stroke-linejoin="round" class="highcharts-point highcharts-color-0"/><path fill="#FF0000" d="M 417.5639134144132 55.6288151264761 A 106.5 106.5 0 1 1 297.34492897209134 211.00988300132843 L 390 158.5 A 0 0 0 1 0 390 158.5 Z" transform="translate(0,0)" stroke-linejoin="round" class="highcharts-point highcharts-color-1"/><path fill="#4B0082" d="M 297.2924654253733 210.91720169080372 A 106.5 106.5 0 0 1 284.767046349842 142.1208832331013 L 390 158.5 A 0 0 0 0 0 390 158.5 Z" transform="translate(0,0)" stroke-linejoin="round" class="highcharts-point highcharts-color-2"/><path fill="#FF7F00" d="M 284.78347808035153 142.01565848654766 A 106.5 106.5 0 0 1 389.8520736365954 52.00010273342508 L 390 158.5 A 0 0 0 0 0 390 158.5 Z" transform="translate(0,0)" stroke-linejoin="round" class="highcharts-point highcharts-color-3"/></g><g class="highcharts-markers highcharts-series-0 highcharts-pie-series highcharts-color-undefined " transform="translate(10,10) scale(1 1)"/></g><g class="highcharts-data-labels highcharts-series-0 highcharts-pie-series highcharts-color-undefined highcharts-tracker" visibility="visible" transform="translate(10,10) scale(1 1)" opacity="1"><path fill="none" class="highcharts-data-label-connector highcharts-color-0" stroke="#9400D3" stroke-width="1" d="M 412.84416069455995 23.171378012237486 C 407.84416069455995 23.171378012237486 405.49108455901364 41.01691058205232 404.7067258471649 46.965421438657266 L 403.9223671353161 52.913932295262214"/><path fill="none" class="highcharts-data-label-connector highcharts-color-1" stroke="#FF0000" stroke-width="1" d="M 502.8926505235064 242.11474728187912 C 497.8926505235064 242.11474728187912 483.6650482566704 231.0886267611918 478.92251416772507 227.413253254296 L 474.17998007877975 223.7378797474002"/><path fill="none" class="highcharts-data-label-connector highcharts-color-2" stroke="#4B0082" stroke-width="1" d="M 250.69601135217135 182.8862386046703 C 255.69601135217135 182.8862386046703 273.40642743759935 179.6704708765819 279.3098994660753 178.59854830055244 L 285.21337149455127 177.52662572452297"/><path fill="none" class="highcharts-data-label-connector highcharts-color-3" stroke="#FF7F00" stroke-width="1" d="M 296.2511371792423 54.78939616402607 C 301.2511371792423 54.78939616402607 312.9542839248367 68.46551974679187 316.85533284003486 73.0242276077138 L 320.756381755233 77.58293546863572"/><g class="highcharts-label highcharts-data-label highcharts-data-label-color-0 " transform="translate(418,13)"><text x="5" style="font-size:10px;font-weight:normal;font-family:Arial, Helvetica, sans-serif;font-style:normal;color:#000;fill:#000;" y="15"><tspan x="5" y="15" class="highcharts-text-outline" fill="#FFFFFF" stroke="#FFFFFF" stroke-width="2px" stroke-linejoin="round">t</tspan><tspan x="5" dy="13" class="highcharts-text-outline" fill="#FFFFFF" stroke="#FFFFFF" stroke-width="2px" stroke-linejoin="round">105,200.00</tspan><tspan x="5" dy="13" class="highcharts-text-outline" fill="#FFFFFF" stroke="#FFFFFF" stroke-width="2px" stroke-linejoin="round">4.17%</tspan><tspan x="5" y="15">t</tspan><tspan x="5" dy="13">105,200.00</tspan><tspan x="5" dy="13">4.17%</tspan></text></g><g class="highcharts-label highcharts-data-label highcharts-data-label-color-1 " transform="translate(508,232)"><text x="5" style="font-size:10px;font-weight:normal;font-family:Arial, Helvetica, sans-serif;font-style:normal;color:#000;fill:#000;" y="15"><tspan x="5" y="15" class="highcharts-text-outline" fill="#FFFFFF" stroke="#FFFFFF" stroke-width="2px" stroke-linejoin="round">o</tspan><tspan x="5" dy="13" class="highcharts-text-outline" fill="#FFFFFF" stroke="#FFFFFF" stroke-width="2px" stroke-linejoin="round">1,579,096.00</tspan><tspan x="5" dy="13" class="highcharts-text-outline" fill="#FFFFFF" stroke="#FFFFFF" stroke-width="2px" stroke-linejoin="round">62.64%</tspan><tspan x="5" y="15">o</tspan><tspan x="5" dy="13">1,579,096.00</tspan><tspan x="5" dy="13">62.64%</tspan></text></g><g class="highcharts-label highcharts-data-label highcharts-data-label-color-2 " transform="translate(183,173)"><text x="5" style="font-size:10px;font-weight:normal;font-family:Arial, Helvetica, sans-serif;font-style:normal;color:#000;fill:#000;" y="15"><tspan x="5" y="15" class="highcharts-text-outline" fill="#FFFFFF" stroke="#FFFFFF" stroke-width="2px" stroke-linejoin="round">f</tspan><tspan x="5" dy="13" class="highcharts-text-outline" fill="#FFFFFF" stroke="#FFFFFF" stroke-width="2px" stroke-linejoin="round">268,642.00</tspan><tspan x="5" dy="13" class="highcharts-text-outline" fill="#FFFFFF" stroke="#FFFFFF" stroke-width="2px" stroke-linejoin="round">10.66%</tspan><tspan x="5" y="15">f</tspan><tspan x="5" dy="13">268,642.00</tspan><tspan x="5" dy="13">10.66%</tspan></text></g><g class="highcharts-label highcharts-data-label highcharts-data-label-color-3 " transform="translate(229,45)"><text x="5" style="font-size:10px;font-weight:normal;font-family:Arial, Helvetica, sans-serif;font-style:normal;color:#000;fill:#000;" y="15"><tspan x="5" y="15" class="highcharts-text-outline" fill="#FFFFFF" stroke="#FFFFFF" stroke-width="2px" stroke-linejoin="round">t</tspan><tspan x="5" dy="13" class="highcharts-text-outline" fill="#FFFFFF" stroke="#FFFFFF" stroke-width="2px" stroke-linejoin="round">567,972.00</tspan><tspan x="5" dy="13" class="highcharts-text-outline" fill="#FFFFFF" stroke="#FFFFFF" stroke-width="2px" stroke-linejoin="round">22.53%</tspan><tspan x="5" y="15">t</tspan><tspan x="5" dy="13">567,972.00</tspan><tspan x="5" dy="13">22.53%</tspan></text></g></g></svg></div></div><div id="graph0_legend" style="font-size: 10px; font-family: Arial, Helvetica, sans-serif; font-weight: normal; font-style: normal; color: rgb(0, 0, 0);"><div style="display: table; border: 1px solid rgb(204, 204, 204); border-collapse: separate; border-spacing: 5px; margin: 0px auto 15px; background-color: rgb(255, 255, 255);"><div style="display: table-row;"><div index="0" isrevealed="true" style="display: table-cell;"><span style="display: table-cell; width: 18px; margin-right: 10px; vertical-align: middle; background-color: rgb(148, 0, 211); height: 12px;"></span><span style="display: table-cell; vertical-align: middle;">t - three</span></div><div index="1" isrevealed="true" style="display: table-cell;"><span style="display: table-cell; width: 18px; margin-right: 10px; vertical-align: middle; background-color: rgb(255, 0, 0); height: 12px;"></span><span style="display: table-cell; vertical-align: middle;">o - one</span></div><div index="2" isrevealed="true" style="display: table-cell;"><span style="display: table-cell; width: 18px; margin-right: 10px; vertical-align: middle; background-color: rgb(75, 0, 130); height: 12px;"></span><span style="display: table-cell; vertical-align: middle;">f - four</span></div><div index="3" isrevealed="true" style="display: table-cell;"><span style="display: table-cell; width: 18px; margin-right: 10px; vertical-align: middle; background-color: rgb(255, 127, 0); height: 12px;"></span><span style="display: table-cell; vertical-align: middle;">t - two</span></div></div></div></div></div>";

        function Jeff() {
            var img = new Image();
            document.body.appendChild(img);
            img.setAttribute("src",b64);
            img.onload = function() {
                // document.getElementsByTagName("body")[0].appendChild(this);
                console.log("image is loaded");
            };
            img.src = b64;
            // img.src = "http://pierre.chachatelier.fr/programmation/images/mozodojo-original-image.jpg";
        }
        Jeff();
    })();
</script>

</html>

谢谢。 Jeffrin。

Answer 1

将svg的base64字符串设置为src的{{1}}绝对可以正常工作。例如，尝试下面这个简单的base64 svg字符串：

img

看起来问题是你的svg是不正确的。从base64解码后，它周围有几个div（例如标题，图例）。如果您只是将图表svg本身并将其编码为base64，它将起作用：

https://jsfiddle.net/b7kru6e0/

您可以将其他组件作为html添加/附加。

如何将base64 svg字符串设置为图像标记src？

1 个答案: