arcgis动态层改post请求

为知笔记

有时候重写 DynamicMapServiceLayer后参数太多要用post请求：

改arcgis init.js源码：

搜索

"esri/layers/ArcGISDynamicMapServiceLayer" 这个关键key对应的类，因为是key value形式

找到方法getImageUrl

_jsonRequest是esri/request的别名

加{usePost: true}

getImageUrl: function (b, e, g, f) {
    var k = this._url.path + "/export", q = this._params, r = q.token = this._getToken(),
        p = b.spatialReference.wkid || m.toJson(b.spatialReference.toJson()),
        t = this._errorHandler;
    delete q._ts;
    n.mixin(q, {
        bbox: b.xmin + "," + b.ymin + "," + b.xmax + "," + b.ymax,
        bboxSR: p,
        imageSR: p,
        size: e + "," + g
    }, this.disableClientCaching ? {_ts: (new Date).getTime()} : {});
    q.layerDefs && (b = d._serializeLayerDefinitions(q.layerDefs, 10.5 <= this.version), q = n.mixin({}, q), delete q.layerDefs, q.layerDefs = b);
    b = a.addProxy(a.normalize(k) + "?" + l.objectToQuery(n.mixin({}, q, {f: "image"})));
    /*
    这是原方法，现在直接改为下面的post
    b.length > h.defaults.io.postLength || this.useMapImage ? this._jsonRequest = c({
        url: k, content: n.mixin(q, {f: "json"}), callbackParamName: "callback",
        load: function (b) {
            b.imageData ? b = "data:" + (b.contentType || "image") + ";base64," + b.imageData : (b = b.href, r && (b += -1 === b.indexOf("?") ? "?tokenx3d" + r : "x26tokenx3d" + r), b = a.addProxy(b));
            f(b)
        }, error: t
    }) : f(b)
    */
    this._jsonRequest = c({
        url: k,
        content: n.mixin(q, {f: "json"}),
        callbackParamName: "callback",
        load: function (b) {
            b.imageData ? b = "data:" + (b.contentType || "image") + ";base64," + b.imageData : (b = b.href, r && (b += -1 === b.indexOf("?") ? "?tokenx3d" + r : "x26tokenx3d" + r), b = a.addProxy(b));
            f(b)
        },
        error: t
    }, {usePost: true});
    this._jsonRequest.then(function(b){
        b.imageData ? b = "data:" + (b.contentType || "image") + ";base64," + b.imageData : (b = b.href, r && (b += -1 === b.indexOf("?") ? "?tokenx3d" + r : "x26tokenx3d" + r), b = a.addProxy(b));
        f(b)
    },t);
}